SFD2EB4254F Specifications and Applications Information Smar or ce LED Smartt F For orce Driver 12/19/12 1.115 [28,32] Designed, manufactured and supported within the USA, the SFD2E features: 10 mm or less in height Wide input voltage range Constant LED current External dimming or on-board dimming High dimming ratio Soft start One year warranty 1 Input 4.585 [116,5] 2.105 [53,47] .125 [3,18] Dia. (2x) Input Connector Connectors Output Connector * Molex 53261-0871 J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J1-7 J1-8 Vin(+) Vin(+) Vin(+) GND GND GND Enable Control Molex 53261-1271 J2-1 J2-2 J2-3 J2-4 J2-5 J2-6 Cathode 1 Anode A Cathode 2 Anode B Cathode 3 (do not use) J2-7 J2-8 J2-9 J2-10 J2-11 J2-12 .700 [17,79] Output Cathode 4 (do not use) (do not use) (do not use) (do not use) (do not use) * Requires harness: ERG part number H18106152F recommended 1 .145 [3,68] PCB components are shown for reference only. Actual product may differ from that shown. Package Configuration The ERG Smart Force Series of LED Drivers are specifically designed for applications which require wide dimming and LCD brightness stability over a wide input voltage range. The SFD2EB4254F is designed to provide backlight power for the NEC NL12876B26-32D display. .830 [21,08] Mass: 18 grams typ. page 1 of 5. SFD2EB4254F Absolute Maximum Ratings Rating Symbol Value Units Input Voltage Range Vin -0.3 to +20.0 V dc Storage Temperature Tstg -40 to +85 Enable Input Voltage VEnable 0 to Vin V dc Control Input Voltage VPWM 0 to +5.0 V dc Symbol Min Typ Max Units V in +10.8 +12.0 +18.0 V dc Ts -40 - +80 I peak - 0.9 - A dc I in 0.62 0.73 0.84 A dc V LE D 22 - 39 V dc h - 85 - % I out 66 70 74 mAdc Turn-on Threshold Vthon - - 2.0 V dc Turn-off Threshold Vthoff 0.8 - - V dc REnable - 10 - kOhms Full-on Threshold Vthon - 1.0 - V dc Full-off Threshold Vthoff - 4.5 - V dc Control Input Bias Current I C bi as - - 10 uA Frequency FPWM - 245 - Hz o C Operating Characteristics Unless otherwise noted Vin = 12.00 Volts dc and Ta = 25oC. Characteristic Input Voltage Component Surface Temperature (Note 1) Peak Inrush Current (Note 2) Input Current LED String Voltage Efficiency (Note 3) Output Current (per string) o C Enable Pin (Note 4) Enable Input Impedance (Note 5) Control Pin (Notes 6,7) Specifications subject to change without notice. Note 1 Note 2 Note 3 Note 4 Note 5 Note 6 Note 7 Surface temperature must not exceed 80C. Peak inrush occurs over a 1 to 3 ms time period during initial startup. Efficiency is calculated using a 26.5V LED string. Enable pin is internally pulled up above the turn-on threshold. Enable pin input impedance is 10k to 12V. Control pin is internally pulled up above the turn-on threshold. Control pin input impedance is 485k. page 2 of 5. SFD2EB4254F Application Information The ERG SFD2EB4254F has been designed to be configured in multiple ways: NO DIMMING * OPERATION: The SFD2E can be configured to operate without dimming by floating the Control (J1-8) pin and Enable (J1-7) pin. * Pins 1, 2 and 3 of connector J1 must be connected to +Vin, between 10.8 and 18 Vdc. Pins 4, 5 and 6 of connector J1 must be connected to GND. ONBOARD PWM DIMMING * * * * OPERATION: Onboard PWM configuration as shown in Figure 1 allows the user to control display brightness by controlling the onboard PWM generator. The user is responsible to provide an analog control signal. DIMMING: Dimming is accomplished by applying an analog voltage to the Control Pin (J1-8). Display brightness is modulated by controlling the Control Pin voltage as shown in Graph 1. ENABLE/DISABLE: The driver may be enabled or disabled (turned on and off) by applying a DC voltage to the Enable Pin(J1-7). Enable Pin on and off levels are specified in the Operating Characteristics section of the data sheet. Enable pin is internally pulled up above the turn-on threshold. Pins 1, 2 and 3 of connector J1 must be connected to +Vin, between 10.8 and 18 Vdc. Pins 4, 5 and 6 of connector J1 must be connected to GND. EXTERNAL PWM DIMMING * * * OPERATION: External PWM configuration as shown in Figure 2 allows the user to control display brightness with an externally generated PWM signal. The user is responsible to provide the PWM signal. DIMMING: Dimming is accomplished by applying a PWM signal to the Enable Pin (J1-7). Enable on and off levels are specified in the Operating Characteristics section of the data sheet. Display brightness is modulated by controlling the PWM duty cycle as shown in Graph 2. Pins 1 through 3 of connector J1 must be connected to +Vin, between 10.8 and 18 Vdc. Pins 4 through 6 of connector J1 must be connected to GND. page 3 of 5. SFD2EB4254F ONBOARD PWM DIMMING Graph 1 J1 +12V J2 1,2,3 4,5,6 Vin Cathode 1 GND Cathode 2 Optional Potentiometer 1,2,3 Analog Dimming Voltage (0 to 5V) 8 4,5,6 Anode A Vin Control Cathode 3 GND Cathode 4 +On -Off 7 Enable Anode B Figure 1 page 4 of 5. SFD2EB4254F EXTERNAL PWM DIMMING (1) (1) Nonlinear relationship from 0 to 2% duty cycle. Graph 2 J1 +12V J2 1,2,3 4,5,6 Vin Cathode 1 GND Cathode 2 Anode A 8 Control Cathode 3 Cathode 4 Duty Cycle 0% - 100% 5V 7 0V Enable Anode B search Gr Re R 13 M (R) c. RE UL p, In ou Endi co tt Figure 2 IS G I I O S TE RE D F 3 900 A3 1 Endicott Research Group, Inc. (ERG) reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by ERG is believed to be accurate and reliable. However, no responsibility is assumed by ERG for its use. page 5 of 5.