SFDMDB3638F Specifications and Applications Information Smar or ce LED Smartt F For orce Driver 03/30/11 Package Configuration The ERG Smart Force Series of LED Drivers are specifically designed for applications which require high efficiency, small footprint and LCD brightness stability over a wide input voltage range. The SFDMDB3638F is designed to provide backlight power for the NEC NL10276BC13-01C display. Less than 5 mm in height Wide input voltage range Constant LED current With internal dimming signal, up to 255:1 dimming ratio Open and short circuit protection High efficiency Separate enable and dimming function Soft start One year warranty J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J1-7 J1-8 Vin(+) Vin(+) GND GND Enable N/C Control Fault Indicator (output) .125 [3,18] Dia. (2x) 1.206 [30,63] .942 [23,92] Connectors Output Connector * Molex 53261-0871 Molex 53261-1271 J2-1 J2-2 J2-3 J2-4 J2-5 J2-6 Output 1 2.782 [70,66] Input Connector .685 [17,40] Cathode 1 Anode 1 Cathode 2 Anode 2 Cathode 3 Anode 3 J2-7 J2-8 J2-9 J2-10 J2-11 J2-12 1 Input .135 [3,43] Cathode 4 Anode 4 Cathode 5 Anode 5 Cathode 6 Anode 6 * Requires harness: ERG part number H10312152 recommended .96 [24,4] PCB components are shown for reference only. Actual product may differ from that shown. Designed, manufactured and supported within the USA, the SFDMD features: Mass: 9 grams typ. page 1 of 5. SFDMDB3638F Absolute Maximum R atings R ating Symbol Value U nits Input Voltage Range Vin -0.3 to +20.0 V dc Storage Temperature Tstg -40 to +85 Enable Input Voltage VEnable 0 to Vi n V dc C ontrol Input Voltage VPWM 0 to +5.0 V dc V FL 0 to +4.0 V dc Symbol Min Typ Max U nits V in +8.0 +12.0 +18.0 V dc Temperature (Note 1) Ts -40 - +80 Input C urrent I in 0.23 0.27 0.31 A dc V LE D 26.0 (Note 3) - 38.5 V dc h - 89 - % I out 15 16 17 mAdc Turn-on Threshold Vthon - - 3.5 V dc Turn-off Threshold Vthoff 0.8 - - V dc REnable - 9.0 - kOhms Vthon - 1.0 - V dc VPWmin - 4.5 - V dc C ontrol Input Bi as C urrent I C bi as - - 10 uA Frequency FPWM - 245 - Hz Fault Indi cator o C Operating C haracteristics Unless otherwi se noted Vi n = 12.00 Volts dc and Ta = 25oC . C haracteristic Input Voltage C omponent Surface LED Stri ng Voltage (Note 2) Effi ci ency (Note 4) Output C urrent (per stri ng) o C Enable Pin (Note 5) Enable Input Impedance (Note 6) C ontrol Pin (Notes 7,8) Full-on Threshold Mi ni mum Pulse Wi dth Threshold (Operating Characteristics and notes are continued on next page.) page 2 of 5. SFDMDB3638F Operating Characteristics (continued) Characteristic Symbol Min Typ Max Units VNFL - 2.5 - V dc V FL Specifications subject to change without notice. - 0.3 - V dc Fault Indicator No Fault Level (Note 9) Fault Level (Note 9) Note 1 Note 2 Note 3 Surface temperature must not exceed 80C, except U1, which cannot exceed 95C. Exceeding maximum string voltage specification will damage the LED driver. The LED driver is capable of driving strings less than the minimum string voltage specification, although doing so will limit the maximum input voltage. To determine max Vin: minimum LED string voltage (1.3) x (Vin maximum) Note 4 Note 5 Note 6 Note 7 Note 8 Note 9 Efficiency is calculated using a 30V LED string. The Enable pin is internally pulled up above the turn-on threshold. Enable pin input impedance is 9k to 8V with a 12V input voltage. Control pin is internally pulled up above the turn-on threshold. Control pin input impedance is 485k. Loading with an impedance less than 100k to Vcc or to ground may cause the default levels to change. page 3 of 5. SFDMDB3638F Application Information The ERG SFDMDB3638F has been designed to be configured in multiple ways: NO DIMMING * OPERATION: The SFD can be configured to operate without dimming by floating the Enable (J1-5) and Control (J1-7) pins. * Pins 1 and 2 of connector J1 must be connected to +Vin, between 8 and 18 Vdc. Pins 3 and 4 of connector J1 must be connected to GND. * DISABLING DRIVER: Pulling the Enable pin (J1-5) below the minimum turn-off threshold of 0.8V will disable the driver. Disabling the driver will require the ability to sink 2mA below the turn-off threshold. This pin may be driven by an open collector stage or a totem pole stage. 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. A dimming ratio up to 255:1 is possible with this configuration. DIMMING: Dimming is accomplished by applying an analog voltage to the Control Pin (J1-7). 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(J1-5). Enable Pin on and off levels are specified in the Operating Characteristics section of the data sheet. The driver can also be enabled by floating the Enable Pin. Pins 1 and 2 of connector J1 must be connected to +Vin, between 8 and 18 Vdc. Pins 3 and 4 of connector J1 must be connected to GND. FAULT INDICATOR * The Fault Indicator pin (J1-8) may be used as a feedback signal that will fall below the fault level of 0.3V in the case of an open string, a shorted string, an output overvoltage condition, or an over temperature condition. If used, this pin should be loaded with a high impedance stage as specified in the Operating Characteristics. Do not drive this pin with a voltage, as it will damage the driver. page 4 of 5. SFDMDB3638F ONBOARD PWM DIMMING Graph 1 J1 +12V J2 1,2 + Anode 1 Vin Cathode 1 (1) 3,4 GND Anode 2 Cathode 2 Optional Potentiometer 1,2 Analog Dimming Voltage (0 to 5V) 7 3,4 +On -Off (output) 5 8 Anode 3 Vin Cathode 3 Control Anode 4 Cathode 4 GND Anode 5 Cathode 5 Enable Anode 6 Fault Cathode 6 Figure 1 search Gr Re R 13 M (R) c. RE UL p, In ou Endi co tt (1) Low ESR type input by-pass capacitor (10 uF - 220 uF) may be required to reduce reflected ripple and to improve power supply response. 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.