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Part No.	PT6903
Manufacturer	PTC
Size	233 Kbytes
Pages	4 pages
Description	High Brightness LED Driver

Datasheet Summary with AI

## PIN CONFIGURATION
· SOP-8: RT, CS, GND, SW, VIN, PWMD, VDD, LD
· TO252: RT, CS, GND, SW, VIN

## PIN DESCRIPTION
· RT: Fixed off-time setting resistor
· CS: LED string current sense
· GND: Ground
· SW: Internal switch
· VIN: Positive input supply voltage
· PWMD: PWM dimming & enable input
· VDD: Internal regulated voltage
· LD: Linear dimming

## PROTECTION FEATURES
· Thermal Shutdown: Turns off switch at ~135°C, restarts at ~115°C
· Over Current: Protection triggers at approximately 2x set current (requires power-up to reset).
· Temperature Compensation: (SOP8 Package Only) Uses NTC thermistor on LD pin to reduce current when temperature rises, voltage on LD pin under 240mV.

# PT6903 High Brightness LED Driver

## FEATURES
· Efficiency: >90%
· Input Voltage: 7V to 36V
· Driver Type: Constant Current
· Output Current: Up to 1.0A
· Dimming: Linear & PWM
· Protection: Thermal Shutdown, Over Current
· Switch: Internal 40V Power NMOS

## APPLICATIONS
· DC/DC LED Driver
· Low Voltage Industrial LED Lighting
· Low Voltage Halogen Replacement LEDs
· Decorative LED Lighting

## ORDERING INFORMATION
· PT6903-S: 8-Pin SOP, 150 MIL
· PT6903: 5-Pin TO252

## PIN CONFIGURATION
· SOP-8: RT, CS, GND, SW, VIN, PWMD, VDD, LD
· TO252: RT, CS, GND, SW, VIN

## PIN DESCRIPTION
· RT: Fixed off-time setting resistor
· CS: LED string current sense
· GND: Ground
· SW: Internal switch
· VIN: Positive input supply voltage
· PWMD: PWM dimming & enable input
· VDD: Internal regulated voltage
· LD: Linear dimming

## PROTECTION FEATURES
· Thermal Shutdown: Turns off switch at ~135°C, restarts at ~115°C
· Over Current: Protection triggers at approximately 2x set current (requires power-up to reset).
· Temperature Compensation: (SOP8 Package Only) Uses NTC thermistor on LD pin to reduce current when temperature rises, voltage on LD pin under 240mV.