PR4101A Prema

< version code> <lot code> <date code> < version code> <lot code> <date code> LED DRIVER PR4101 High Power LED Buck Driver PR4101 The PR4101 is a LED buck driver for driving one or several high power LEDs in series. The supply voltage can be up to 40V, with an output current of more than 1A using an external N-channel MOSFET switching transistor. The PR4101A with additional PWM and power down input is delivered SOP14 packaged, while the PR4101B is offered SO8 packaged. Features Applications Adjustable output current of several amps Halogen lamp or filament Supply voltage up to 40V bulb replacement by LEDs Dimming with phase-cut dimmer General illumination Brightness control with PWM (PR4101A only) Warning lights Output current temperature compensation Automotive lighting Delayed start possible (PR4101A only) Indicator signs Over temperature protection LCD backlighting Frequency spreading for improved EMI Low standby current of < 35 A Under voltage lockout Typical Application Vcc 7V ... 40V Vcc D1 CLED 5VLo VDI CIN Gnd L One or SUB more LEDs NDRV Vsense 5VHi RVsense Rsense PR4101 Pin Configurations Test 1 14 RTK 2 PwrDwn 13 Temp Vsense RTK 8 1 Delay 3 12 Vsense 2 NDRV GND 7 PWM 4 11 NDRV 3 6 VDI 5VHi GND 5 10 VDI 5VLo 5 Vcc 4 Vcc SUB 6 9 5VHi 5VLo 7 8 PR4101A: Package SOP14 PR4101B: Package SOP8 Topside marking: version codePR4101 Topside marking: version codePR4101 PREMA Semiconductor GmbH 2007-2008 Page 1/20 Rev 4808LED DRIVER PR4101 Pin Description Pin No. Pin No. Pin Pin Function Description PR4101A PR4101B Name 1 n.c. Test For test and internal use only 2 n.c. PwrDwn Power Down, sleep mode for min. power consumption. When connected to GND, NDRV is clamped to GND. 3 n.c. Delay Not connected: Delay Start is disabled connected to GND: Delay Start is enabled 4 n.c. PWM If V < V the buck converter is switched off. PWM refPWM If V > V the buck converter is switched on. PWM refPWM 5 2 GND Ground 6 2 SUB Substrate has to be connected to GND for PR4101A (internally connected to GND for PR4101B) 7 3 5VHi Internal 5V linear regulator output for high currents. Connect a capacitor of 100 nF to GND. Voltage is not for external use. 8 4 5VLo Internal 5V linear regulator output for low currents. Connect a capacitor of 100 nF to GND. Voltage is not for external use. 9 5 Vcc Supply voltage 10 6 VDI Undervoltage detection pin. If unused, connect to Vcc. For use with phase fired controllers (see application notes). 11 7 NDRV Gate connection for an external n-channel MOSFET. 12 8 VSense Feedback for controlling the output current. Connect this pin to the series resistor RVSENSE and the sense resistor R . SENSE The external MOSFET is switched off when the voltage at this pin is higher than V . SENSE 13 n.c. Temp Voltage output of the internal chip temperature sensor (over temperature protection). Please see Electrical Characteristics for relationship between V and the TEMP chip temperature T . CHIP 14 1 RTK Softstart feature and temperature compensation of the output current. By connecting for example a NTC resistor from RTK to GND the sensing threshold voltage Vsense will be decreased depending on the NTCs temperature. A capacitor C connected to SOFT GND offers a soft ramp up of the LED current. PREMA Semiconductor GmbH 2007-2008 Page 2/20 Rev 4808