QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Features Applications Telecommunications Telecommunications equipment Data communications Data processing Wireless communications Wireless base stations Servers, Workstations LAN/WAN Industrial applications Benefits Fully Voltage Regulated - for IBA 1 High efficiency- no heat sink required Baseplate option RoHS lead-free solder and lead-solder-exempted products are available Delivers up to 35 A (420 Watts) Industry-standard quarter-brick pinout On-board input differential LC-filter Startup into pre-biased load No minimum load required Meets Basic Insulation requirements of EN60950-1 Withstands 100 V input transient for 100 ms Fixed frequency operation Fully protected (OTP, OCP, OVP, UVLO) with automatic recovery Positive or negative logic ON/OFF option Low height of 0.430" (10.4mm) Weight: 1.75 oz (49.6g), 2.15 oz (61.0g) w/baseplate High reliability: MTBF approx. 18.8 million hours, calculated per Telcordia TR-332, Method I Case 1 Approved to the following Safety Standards: UL/CSA60950-1, EN60950-1, and IEC60950-1 Designed to meet Class B conducted emissions per FCC and EN55022 when used with external filter All materials meet UL94, V-0 flammability rating Description The new high performance 35A QME48T35120 DC-DC converter provides a high efficiency single output, in a 1/4 brick package. Specifically designed for operation in systems that have limited airflow and increased ambient temperatures, the QME48T35120 converter utilizes the same pin-out and Input/Output functionality of the industrystandard quarter-bricks. In addition, a baseplate feature is available (-xxxBx suffix) that provides an effective thermal interface for coldplate and heat sinking options. The QME48T35120 converter thermal performance is accomplished through the use of patent-pending circuits, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal management, and a lowbody profile. Low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and downstream devices. The use of 100% automation for assembly, coupled with advanced electronic circuits and thermal design, results in a product with extremely high reliability. Operating from a wide-range 36-75V input, the QME48T35120 converter provides a fully regulated 12.0V output voltage. Employing a standard power pin-out, the QME48T35120 converter is an ideal drop-in replacement for existing high current quarter-brick designs. Inclusion of this converter in a new design can result in significant board space and cost savings. The designer can expect reliability improvement over other available converters because of the QME48T35120 optimized thermal efficiency. 1 Baseplate/heat spreader option (suffix `-xxxBx') facilitates heatsink mounting to further enhance the unit's thermal capability. Rev 0.2c, 18-May-11 www.power-one.com Page 1 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Electrical Specifications Conditions: TA = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. Parameter Notes Absolute Maximum Ratings Input Voltage Min Continuous Transient (100ms) 0 Max Units VDC VDC C Ambient (TA) -40 80 100 85 Component (TC) -40 125 C Baseplate (TB) -40 105 C -55 125 C Operating Temperature (Note: 1) Typ (See Derating Curves) Storage Temperature Isolation Characteristics I/O Isolation (suffix `-xxx0x') 1,500 Isolation Capacitance [Input-to-Output] Isolation Resistance VDC pF 1300 10 I/O Isolation (suffix `-xxxBx') [Input-to-Output & Baseplate-to-Input/Output] Isolation Capacitance [Input-to-Output] Isolation Resistance [Input-to-Output & Baseplate-to-Input/Output] M 1,500 VDC pF 1300 10 M Feature Characteristics Switching Frequency 2 Output Voltage Trim Range Remote Sense Compensation 2 kHz % n/a % Output Overvoltage Protection Non-latching Overtemperature Shutdown (PCB) Non-latching 130 Auto-Restart Period Applies to all protection features 200 Turn-On Time including Rise Time 20,000F plus Full Load (resistive) 15 30 ms Rise Time Turn-On Time from Vin From 10% to 90% 13 25 ms 5 10 ms Time from UVLO to Vo=90%VOUT(NOM) Resistive load Time from ON to Vo=90%VOUT(NOM) Turn-On Time from ON/OFF Control Resistive load Turn-On Time from Vin Time from UVLO to Vo=90%VOUT(NOM) (w/ Cext max.) Resistive load, CEXT=10,000F load Turn-On Time from ON/OFF Control Time from ON to Vo=90%VOUT(NOM) (w/ Cext max.) Resistive load, CEXT=10,000F load ON/OFF Control (Positive Logic) ON/OFF Control (Negative Logic) 117 250 n/a 3 122 127 ms 12 5 10 % C ms 25 14 ms ms Converter Off (logic low) -20 0.8 VDC Converter On (logic high) 2.4 20 VDC Converter Off (logic high) 2.4 20 VDC Converter On (logic low) -20 0.8 VDC Additional Notes: 1. 2. Reference Figure E for component (T C and TB) locations. This functionality not provided, however the unit is fully regulated. Rev 0.2c, 18-May-11 www.power-one.com Page 2 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Electrical Specifications (continued) Conditions: TA = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. Parameter Notes Min Typ Max Units 36 48 75 VDC Turn-on Threshold 31.5 34 35.5 VDC Turn-off Threshold Lockout Hysteresis Voltage 30 33 34.5 VDC 0.5 2 VDC 7 V/ms 12.3 ADC Input Characteristics Operating Input Voltage Range Input Under Voltage Lockout Non-latching Input Voltage Transient Rate Maximum Input Current 35 ADC, 12 VDC Out @ 36 VDC In Input Stand-by Current converter disabled 10 mADC Input Current @ No Load converter enabled 95 mADC Minimum Input Capacitance (external) ESR < 0.7 150 F Inrush Transient 0.1 Input Reflected-Ripple Current, ic Input Reflected-Ripple Current, iS 25 MHz bandwidth, Io = 35 Amperes (Figure 34) Input Voltage Ripple Rejection 120 Hz A2s 1250 mAPK-PK 100 mAPK-PK 45 dB Output Characteristics Output Voltage Set Point (no load) Output Regulation 1 11.76 12.00 12.24 VDC 60 120 60 120 mV mV 1 Vin = 39 to 75VDC [IOUT = 35Amps] Over Line Over Load Output Voltage Range Over line (36 to 75VDC), load and temp. Output Ripple and Noise - 20 MHz bandwidth External Load Capacitance 2 11.64 12.36 VDC 2 11.00 12.36 VDC 150 mVPK-PK 60 mVrms F m Over line (39 to 75VDC), load and temp. 1 100 IOUT = 35Amps, CEXT =10 F tantalum + 1 F ceramic Full Load (resistive) 4 Output Current Range CEXT ESR 0 1 20,000 0 35 ADC 110 143 %Iomax 70 A Current Limit Inception Non-latching Peak Short-Circuit Current 3 Non-latching, Short = 10 m 55 RMS Short-Circuit Current Non-latching 5 Arms Dynamic Response Load Change 50%-75%-50%, di/dt = 0.1A/s di/dt = 1 A/s Co = 1 F ceramic + 10F tantalum 200 360 mV Co = 1 F ceramic + 10F tantalum 350 540 mV Settling Time to 1% of VOUT 200 s Efficiency 100% Load Vin = 39VDC 95 % 50% Load Vin = 39VDC 96 % Additional Notes: 1 Measured at the output pins of the converter. 2 Operating ambient temperature range of -40 C to 85 C for converter. 3 Peak currents exist for approximately 500uSec per 200msec period. 4 See "Input & Output Impedance", Page 5. Rev 0.2c, 18-May-11 www.power-one.com Page 3 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Environment and Mechanical Specifications Environmental Operating Humidity Non-condensing 95 % Storage Humidity Non-condensing 95 % Mechanical Weight Vibration Shocks No baseplate 1.75 [49.6] With baseplate 2.15 [61.0] GR-63-CORE, Sect. 5.4.2 1 Half Sinewave, 3-axis 50 oz [g] g g Reliability MTBF Telcordia SR-332, Method I Case 1 50% electrical stress, 40C components 18.8 MHrs EMI and Regulatory Compliance Conducted Emissions Rev 0.2c, 18-May-11 CISPR 22 B with external EMI filter network (See Fig. 36) www.power-one.com Page 4 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Operations Input and Output Impedance These power converters have been designed to be stable with no external capacitors when used in low inductance input and output circuits. level voltage of 0.8 V. An external voltage source (20 V maximum) may be connected directly to the ON/OFF input, in which case it must be capable of sourcing or sinking up to 1mA depending on the signal polarity. See the Startup Information section for system timing waveforms associated with use of the ON/OFF pin. In many applications, the inductance associated with the distribution from the power source to the input of the converter can affect the stability of the converter. The addition of a 150 F electrolytic capacitor with an ESR < 0.7 across the input helps to ensure stability of the converter. In many applications, the user has to use decoupling capacitance at the load. The power converter will exhibit stable operation with external load capacitance up to 20,000 F. The converter's output overvoltage protection (OVP) senses the voltage across Vout(+) and Vout(-), so the resistance (and resulting voltage drop) between the output pins of the converter and the load should be minimized to prevent unwanted triggering of the OVP function. Additionally, see the EMC section of this data sheet for discussion of other external components which may be required for control of conducted emissions. Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a pre-determined voltage. ON/OFF (Pin 2) The input voltage must be typically 34 V for the converter to turn on. Once the converter has been turned on, it will shut off when the input voltage drops typically below 33 V. This feature is beneficial in preventing deep discharging of batteries used in telecom applications. The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control options available, positive and negative logic, with both referenced to Vin(-). A typical connection is shown in Fig. A. Protection Features Input Undervoltage Lockout Output Overcurrent Protection (OCP) Vin (+) QME Series Converter Vout (+) (Top View) ON/OFF Vin Vin (-) Rload Vout (-) CONTROL INPUT Fig. A: Circuit configuration for ON/OFF function. The positive logic version turns on when the ON/OFF pin is at logic high and turns off when at logic low. The converter is on when the ON/OFF pin is left open. See the Electrical Specifications for logic high/low definitions. The negative logic version turns on when the ON/OFF pin is at logic low and turns off when the ON/OFF pin is at logic high. The ON/OFF pin can be hardwired directly to Vin(-) to enable automatic power up of the converter without the need of an external control signal. The ON/OFF pin is internally pulled up to 5 V through a resistor. A properly debounced mechanical switch, open-collector transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2mA at a low Rev 0.2c, 18-May-11 The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the converter will switch to constant current operation and thereby begin to reduce output voltage. When the output voltage drops below approx. 60% of the nominal value of output voltage, the converter will shut down. Once the converter has shut down, it will attempt to restart nominally every 200 ms with a typical 3% duty cycle. The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 60% of its nominal value. Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and continues normal operation. Output Overvoltage Protection (OVP) The converter will shut down if the output voltage across Vout(+) (Pin 5) and Vout(-) (Pin 4) exceeds the threshold of the OVP circuitry. The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the converter has shut down, it will attempt to restart every 200 ms until the OVP condition is removed. www.power-one.com Page 5 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Overtemperature Protection (OTP) Absence of the Remote Sense Pins The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation outside the thermal derating curves, or operation in abnormal conditions such as system fan failure. After the converter has cooled to a safe operating temperature, it will automatically restart. Users should note that this converter does not have a Remote Sense feature. Care should be taken to minimize voltage drop on the user's motherboard. Safety Requirements The converters are safety approved to UL/CSA60950-1, EN60950-1, and IEC60950-1. Basic Insulation is provided between input and output. The converters have no internal fuse. To comply with safety agencies requirements, an input line fuse must be used external to the converter. A 20-A fuse is recommended for use with this product. The QME48T35120 converter is CSA approved for a maximum fuse rating of 20A. Electromagnetic Compatibility (EMC) EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics of board mounted component dc-dc converters exist. However, Power-One tests its converters to several system level standards, primary of which is the more stringent EN55022, Information technology equipment Radio disturbance characteristics-Limits and methods of measurement. An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC. With the addition of a simple external filter, the QME48T35120 converter will pass the requirements of Class B conducted emissions per EN55022 and FCC requirements. Refer to Figures 36 and 37 for typical performance with external filter. Rev 0.2c, 18-May-11 www.power-one.com Page 6 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output VIN Startup Information (using negative ON/OFF) Scenario #1: Initial Startup From Bulk Supply ON/OFF function enabled, converter started via application of VIN. See Figure B. Time Comments ON/OFF pin is ON; system front end power is t0 toggled on, VIN to converter begins to rise. VIN crosses undervoltage Lockout protection t1 circuit threshold; converter enabled. Converter begins to respond to turn-on t2 command (converter turn-on delay). t3 Converter VOUT reaches 100% of nominal value. For this example, the total converter startup time (t3- t1) is typically 8 ms. ON/OFF STATE OFF ON VOUT t0 t1 t2 t t3 Fig. B: Startup scenario #1. VIN Scenario #2: Initial Startup Using ON/OFF Pin With VIN previously powered, converter started via ON/OFF pin. See Figure C. Time Comments t0 VINPUT at nominal value. Arbitrary time when ON/OFF pin is enabled t1 (converter enabled). End of converter turn-on delay. t2 t3 Converter VOUT reaches 100% of nominal value. For this example, the total converter startup time (t3- t1) is typically 8 ms. Scenario #3: Turn-off and Restart Using ON/OFF Pin With VIN previously powered, converter is disabled and then enabled via ON/OFF pin. See Figure D. Time Comments t0 VIN and VOUT are at nominal values; ON/OFF pin ON. ON/OFF pin arbitrarily disabled; converter t1 output falls to zero; turn-on inhibit delay period (200 ms typical) is initiated, and ON/OFF pin action is internally inhibited. ON/OFF pin is externally re-enabled. t2 If (t2- t1) 200 ms, external action of ON/OFF pin is locked out by startup inhibit timer. If (t2- t1) > 200 ms, ON/OFF pin action is internally enabled. Turn-on inhibit delay period ends. If ON/OFF pin t3 is ON, converter begins turn-on; if off, converter awaits ON/OFF pin ON signal; see Figure D. End of converter turn-on delay. t4 t5 Converter VOUT reaches 100% of nominal value. For the condition, (t2- t1) 200 ms, the total converter startup time (t5- t2) is typically 208 ms. For (t2- t1) > 200 ms, startup will be typically 8 ms after release of ON/OFF pin. ON/OFF STATE OFF ON VOUT t0 t1 t2 t t3 Fig. C: Startup scenario #2. V IN 200 ms ON/OFF STATE OFF ON VOUT t0 t1 t2 t3 t4 t t5 Fig. D: Startup scenario #3. Rev 0.2c, 18-May-11 www.power-one.com Page 7 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Characterization For each set of conditions, the maximum load current was defined as the lowest of: General Information Case I : TC (Hotspot) 120C The converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mountings, efficiency, startup and shutdown parameters, output ripple and noise, transient response to load step-change, overload, and short circuit. (i) The output current at which any FET junction (TJ) temperature does not exceed a maximum temperature of 120C as indicated by the thermal measurement, or (ii) The output current at which the temperature at the thermocouple locations TC do not exceed 120C. (Fig. E) (iii) The nominal rating of the converter (35 A). Test Conditions All data presented were taken with the converter soldered to a test board, specifically a 0.060" thick printed wiring board (PWB) with four layers. The top and bottom layers were not metalized. The two inner layers, comprised of two-ounce copper, were used to provide traces for connectivity to the converter. The lack of metallization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the PW B was minimized. This provides a worst-case but consistent scenario for thermal derating purposes. Case II : TC (Hotspot) 125C (i) The output current at which any FET junction (TJ) temperature does not exceed a maximum temperature of 125C as indicated by the thermal measurement, or (ii) The output current at which the temperature at the thermocouple locations TC do not exceed 125C. (Fig. E) (iii) The nominal rating of the converter (35 A). All measurements requiring airflow were made in the vertical and horizontal wind tunnel using Infrared (IR) thermography and thermocouples for thermometry. Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. The use of AWG #36 gauge thermocouples is recommended to ensure measurement accuracy. Careful routing of the thermocouple leads will further minimize measurement error. Refer to Fig. E for the optimum measuring thermocouple location. Thermocouple (TB) Area Thermocouples (TC) Fig. E: Location of the thermocouples for thermal testing. Output Power Thermal Derating Thermal characterization is provided for the hotspot temperatures of both 120C and 125C. Load current vs. ambient temperature and airflow rates are shown in Fig. 1, Fig. 3, Fig. 5 and Fig. 7. Ambient temperature was varied between 25C and 85C, with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s). Rev 0.2c, 18-May-11 The output power vs. ambient temperature and airflow rates are given in Fig. 2 and Fig. 4 w/o baseplate. The output power vs. ambient temperature and airflow rates are given in Fig. 6 and Fig. 8 with baseplate. The ambient temperature varies between 25C and 85C with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s). www.power-one.com Page 8 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Thermal Derating - Baseplate Cooled Power Dissipation The maximum load current rating vs. baseplate temperature is provided for Baseplate Models with commercially available heatsinks attached. The various configurations, TC-MAX(Hotspot) and Figure references, are listed below. Note: T C Hotspot TJ MOSFET For a 1/4" heatsink, AAvid Thermalloy PNU Power dissipation vs. load current is showing in Fig. 25 for T A = 25C, airflow rate of 300LFM (1.5m/s) with vertical mounting and input voltages of 36V, 48V, and 75V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature with Vin = 48V, airflow rate of 200 LFM (1m/s) with vertical mounting is shown in Fig. 26. 241402B92200G, TC 120C, current derating is provided in Figure 9. Power Derating is provided in Figure 10. Startup For a 1/4" heatsink, AAvid Thermalloy PNU 241402B92200G, TC 125C, current derating is provided in Figure 11. Power Derating is provided in Figure 12. a 1/2" heatsink, AAvid Thermalloy PNU 241404B92200G, TC 120C, current derating is provided in Figure 13. Power Derating is provided in Figure 14. For a 1/2" heatsink, AAvid Thermalloy PNU 241404B92200G, TC 125C, current derating is provided in Figure 15. Power Derating is provided in Figure 16. For For a 1" heatsink, AAvid Thermalloy PNU 241409B92200G, TC 120C, current derating is provided in Figure 17. Power Derating is provided in Figure 18. Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are shown without and with external load capacitance in Fig. 27 and Fig. 28, respectively. Ripple and Noise Fig. 31 show the output voltage ripple waveform, For measured at full rated load current with a 10 F tantalum and 1 F ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1 F ceramic capacitor. Thermal Derating - Coldplate Cooled The input reflected ripple current waveforms are obtained using the test setup shown in Fig. 32. The corresponding waveforms are shown in Fig. 33 and Fig. 34. a 1" heatsink, AAvid Thermalloy PNU 241409B92200G, TC 125C, current derating is provided in Figure 19. Power Derating is provided in Figure 20. The converter was shieled from air flow. The baseplate temperature was maintained 85C, with an airflow rate of 30LFM ( 0.15m/s). Thermocouple measurements (in Fig. E) were recorded as T C 120C and T B 85C. Refer to Figure 21 and Figure 22. Efficiency Efficiency vs. load current is showing in Fig. 23 for ambient temperature (TA) of 25C, airflow rate of 300LFM (1.5m/s) with vertical mounting and input voltages of 36V, 48V, and 75V. Also, a plot of efficiency vs. load current, as a function of ambient temperature with Vin = 48V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. 24. Rev 0.2c, 18-May-11 www.power-one.com Page 9 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 1 & 2 without Baseplate, T C 120C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 30 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 1: Available output current vs. ambient air temperature and airflow rates for converter w/o baseplate mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V. Fig. 2: Available output power vs. ambient air temperature and airflow rates for converter w/o baseplate mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V. 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 3 & 4 with Baseplate, T C 120C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 3: Available output current vs. ambient air temperature and airflow rates for converter with baseplate mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V. Rev 0.2c, 18-May-11 30 Fig. 4: Available output power vs. ambient air temperature and airflow rates for converter with baseplate mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V. www.power-one.com Page 10 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 5 & 6 without Baseplate, T C 125C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 30 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 5: Available output current vs. ambient air temperature and airflow rates for converter w/o baseplate mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125C, Vin = 48 V. Fig. 6: Available output power vs. ambient air temperature and airflow rates for converter w/o baseplate mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125C, Vin = 48 V. 40 450 35 400 350 30 Output Power W] Load Current [Adc] Figures 7 & 8 with Baseplate, T C 125C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 7: Available output current vs. ambient air temperature and airflow rates for converter with baseplate mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125C, Vin = 48 V. Rev 0.2c, 18-May-11 30 Fig. 8: Available output power vs. ambient air temperature and airflow rates for converter with baseplate vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125C, Vin = 48 V. www.power-one.com Page 11 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 9 & 10 with 1/4" Finned Heatsink, T C 120C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 30 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 9: Available output current vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V, 1/4" Heatsink. Fig. 10: Available output power vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V, 1/4" Heatsink. 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 11 & 12 th 1/4" Finned Heatsink, T C 125C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 11: Available output current vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125 C, Vin = 48 V, 1/4" Heatsink. Rev 0.2c, 18-May-11 30 Fig. 12: Available output power vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125 C, Vin = 48 V, 1/4" Heatsink. www.power-one.com Page 12 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 13 & 14 with 1/2" Finned Heatsink, T C 120C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 30 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 13: Available output current vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120C, Vin = 48 V, 1/2" Heatsink. Fig. 14: Available output power vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V, 1/2" Heatsink. 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 15 & 16 with 1/2" Finned Heatsink, T C 125C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 15: Available output current vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125 C, Vin = 48 V, 1/2" Heatsink. Rev 0.2c, 18-May-11 30 Fig. 16: Available output power vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125 C, Vin = 48 V, 1/2" Heatsink. www.power-one.com Page 13 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output 450 450 400 400 350 350 Output Power [W] Output Power [W] Figures 17& 18 with 1" Finned Heatsink, T C 120C 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 50 50 0 0 20 30 40 50 60 70 80 90 20 30 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 17: Available output current vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V, 1" Heatsink. Fig. 18: Available output current vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 120 C, Vin = 48 V, 1" Heatsink. 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 19 & 20 with 1" Finned Heatsink, T C 125C 25 20 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 15 10 300 250 200 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 30 LFM (0.15 m/s) 150 100 5 50 0 0 20 30 40 50 60 70 80 90 20 Ambient Temperature [C] 40 50 60 70 80 90 Ambient Temperature [C] Fig. 19: Available output current vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125 C, Vin = 48 V, 1" Heatsink. Rev 0.2c, 18-May-11 30 Fig. 20: Available output power vs. ambient air temperature and airflow rates for converter mounted vertically with air flowing from pin 1 to pin 3, MOSFET temperature 125 C, Vin = 48 V, 1" Heatsink. www.power-one.com Page 14 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output 40 450 35 400 350 30 Output Power [W] Load Current [Adc] Figures 21 & 22 Coldplate Cooling, TC 120C 25 20 15 10 300 250 200 150 100 5 50 0 0 20 30 40 50 60 70 80 90 100 110 20 30 40 Baseplate Temperature [C] 70 80 90 100 110 Fig. 22: Power derating of QME48T35120 converter with baseplate option and coldplate cooling. (Conditions: Air velocity 30LFM ( 0.15m/s), Vin = 48 V, TB 85C, TC 120C. No thermal derating required. 1.00 0.95 0.95 0.90 0.90 Efficiency 1.00 0.85 75 V 48 V 36 V 0.80 0.85 70 C 55 C 40 C 0.80 0.75 0.75 0 5 10 15 20 25 30 35 0 40 5 10 15 20 25 30 35 40 Load Current [Adc] Load Current [Adc] Fig. 23: Efficiency vs. load current and input voltage for converter w/o baseplate mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 C. Fig. 24: Efficiency vs. load current and ambient temperature for converter w/o baseplate mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). 30.00 35.00 30.00 Power Dissipation [W] 25.00 Power Dissipation [W] 60 Baseplate Temperature [C] Fig. 21: Current derating of QME48T35120 converter with baseplate option and coldplate cooling. (Conditions: Air velocity 30LFM ( 0.15m/s), Vin = 48 V, TB 85C, TC 120C. No thermal derating required. Efficiency 50 20.00 15.00 75 V 48 V 36 V 10.00 5.00 25.00 20.00 15.00 70 C 55 C 40 C 10.00 5.00 0.00 0.00 0 5 10 15 20 25 30 35 40 0 Load Current [Adc] 10 15 20 25 30 35 40 Load Current [Adc] Fig. 25: Power dissipation vs. load current and input voltage for converter w/o baseplate mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 C. Rev 0.2c, 18-May-11 5 Fig. 26: Power dissipation vs. load current and ambient temperature for converter w/o baseplate mounted vertically with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s). www.power-one.com Page 15 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Fig. 27: Turn-on transient at full rated load current (resistive) with no output capacitor at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage (5 V/div.). Time scale: 5 ms/div. Fig. 28: Turn-on transient at full rated load current (resistive) plus 20,000 F at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage (5 V/div.). Time scale: 5 ms/div. Fig. 29: Output voltage response to load current stepchange (17.5 A - 26.25 A - 17.5 A) at Vin = 48 V. Top trace: output voltage (100 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 0.1 A/s. Co = 1 F ceramic + 10 F tantalum. Time scale: 200 s/div. Fig. 30: Output voltage response to load current stepchange (17.5 A - 26.25 A - 17.5 A) at Vin = 48 V. Top trace: output voltage (200 mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 1 A/s. Co = 1 F ceramic + 10 F tantalum. Time scale: 200 s/div. Rev 0.2c, 18-May-11 www.power-one.com Page 16 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output iS 5 H source inductance Vsource iC 33 F ESR < 1 electrolytic capacitor QME 48 DC-DC Converter 1 F Ceramic + 10 F Vout Tantalum Capacitor Fig. 31: Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 F tantalum + 1 F ceramic and Vin = 48 V. Time scale: 2 s/div. Fig. 32: Test setup for measuring input reflected ripple currents, ic and is. Fig. 33: Input reflected ripple current, ic (500 mA/div.), measured at input terminals at full rated load current and Vin = 48 V. Refer to Fig. 32 for test setup. Time scale: 2 s/div. Fig. 34: Input reflected ripple current, is (50 mA/div.), measured through 5 H at the source at full rated load current and Vin = 48 V. Refer to Fig. 32 for test setup. Time scale: 2 s/div. Fig. 35: Load current (top trace, 20 A/div., 100 ms/div.) into a 10 m short circuit during restart, at Vin = 48 V. Bottom trace (20 A/div., 100 ms/div.) is an expansion of the on-time portion of the top trace. Rev 0.2c, 18-May-11 www.power-one.com Page 17 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output C4 L1 C7 L2 UUT V in C1 C2 C3 C5 C6 R lo a d C8 Comp. Des. Description C1, C2, C3, 2 x 1uF, 100V Ceramic Capacitor C4, C5, C7, C8 4700pF Ceramic Capacitor C6 100uF, 100V Electrolytic Capacitor L1, L2 0.59mH, P0469NL Pulse Eng. Or, equiv Fig. 36: Typical input EMI filter circuit to attenuate conducted emissions. Fig. 37: Input conducted emissions measurement (Typ.) of QME48T35120 with input filter shown in Figure 36. Conditions: VIN=48VDC, IOUT = 35AMPS Rev 0.2c, 18-May-11 www.power-one.com Page 18 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Physical Information QME48T35120 Pinout (Through-hole) 2.3000.010 [58.420.25] PINS 1,2,3 O 0.0400.002 [O 1.020.05 ] WITH O 0.076 [1.93] SHOULDER 2.000 [50.80] 0.145 [3.68] PINS 4,5 O 0.0620.002 [O 1.570.05 ] WITH O 0.096 [2.44] SHOULDER 0.430 [10.92] 1 1.4500.010 [36.830.25] 0.300 [7.62] 2X 2 5 PIN ASSIGNMENTS AND LOCATIONS 0.600 [15.24] 4 3 TOP VIEW SIDE VIEW NO HEAT SPREADER PL SIDE VIEW HEAT SPREADER VERSION CL PL Height [HT] J 0.430" [10.4] Max 0.500" +/-0.020 [12.70 +/-0.51] 0.210 [5.33] VIN (+) ON/OFF VIN (-) VOUT (-) VOUT (+) CUSTOMER PCB Min Clearance [CL] 0.028" [0.71] 0.028" [0.71] Pin Length [PL] Special Features Pin Option 0 A 0.188" [4.78] B B 0.145" [3.68] C 0.110" [2.79] 0.005" [0.13] Baseplate (Heat Spreader) Interface PIN 1 MARK 1 2 3 4 5 All dimensions are in inches [mm] Pins 1-3 are O 0.040" [1.02] with O 0.076" [1.93] shoulder Pins 4 and 5 are O 0.062" [1.57] with are O 0.096" [2.44] shoulder Pin Material: Brass Alloy 360 Pin Finish: Tin over Nickel Heatsink Mounting Screw: 3 in lb maximum torque CUSTOMER PCB HT (-xJxBx) Function QME48T35120 Platform Notes CL HT (-xJx0x) Pad/Pin Connections Pad/Pin # Information 2.3000.010 [58.42 0.25] 1.860 [47.24] PIN 1 MARK 1.4500.010 [36.830.25] 1.030 [26.16] 0.220 [5.59] Rev 0.2c, 18-May-11 TOP VIEW HEAT SPREADER INTERFACE M3 X .5 2X LIMIT SCREW PENETRATION TO LESS THAN 0.060 [1.52] www.power-one.com Page 19 of 20 QME48T35120 DC-DC Converter 36-75 VDC Input; 12 VDC @ 35 A Output Converter Part Numbering Ordering Information Product Series Input Voltage Mounting Scheme Rated Load Current Output Voltage QME 48 T 35 120 - ON/OFF Logic Maximum Height [HT] Pin Length [PL] Special Features RoHS N J B 0 G J QuarterBrick Format 36-75 V T Throughhole N Negative 35 A 120 12 V 0.430" for -xJx0x P Positive 0.520" for -xJxBx Through hole A 0.188" B 0.145" C 0.110" 0 STD B Baseplate option No Suffix RoHS lead-solderexemption compliant G RoHS compliant for all six substances The example above describes P/N QME48T35120-NJB0G: 36-75 V input, through-hole mounting, 35 A @ 12 V output, negative ON/OFF logic, a maximum height of 0.430", 0.145" pin length, and standard (no baseplate). RoHS compliant for all 6 substances. Consult factory for availability of other options. Notes: 1. NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of Power-One, Inc. 2. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. Rev 0.2c, 18-May-11 www.power-one.com Page 20 of 20