PT6901_10 Datasheet, PDF (3/4 Pages) Princeton Technology Corp – High Power LED Driver

ORDER INFORMATION
Valid Part Number
PT6901-SA
Package Type
8 Pins, SOP, 150MIL
PIN CONFIGURATION
PT6901
Top Code
PT6901-SA
PIN DESCRIPTION
Pin Name
CS
GND
GD
VIN
PWMD
VDD
LD
RF
Description
Senses LED string current with an external sense resistor. When the voltage of CS pin exceeds
the lower of either the internal 240mV or the voltage of LD pin, the GD output goes low.
IC Ground.
IC output drives the gate of external MOSFET.
Input supply voltage 8V-12V DC.
Low frequency PWM dimming pin, also enable pin. When PWMD pin is floating or is pulled to
GND, IC operates in shut-down mode. When PWMD pin is pulled to high, IC operates normally.
Internal regulated voltage. The voltage acts as power supply of internal control circuit, also
provides a supply voltage for external circuit. The current source capability is limited less than
10mA.
Linear dimming. If the voltage at the LD pin is less than 240mV, the LD pin voltage sets the
current sense threshold.
Oscillator frequency control. The PT6901 operates in constant frequency mode when a resistor
is connected between RF and GND. The PT6901 operates in constant off-time mode when a
resistor is connected between RF and GD.
Pin No.
1
2
3
4
5
6
7
8
V1.5
3
August, 2009