PT6937 Datasheet, PDF (3/15 Pages) Princeton Technology Corp – White LED Step-Up Converter

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White LED Step-Up Converter
PT6937
PIN DESCRIPTION
Pin Name
Description
Pin No.
SW
Switch Pin.
Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
1
GND Ground Pin. Connect directly to local ground plane.
2
Feedback Pin.
Reference voltage is 95mV. Connect cathode of lowest LED and resistor here.
FB
Calculate resistor value according to the formula:
3
RFB=95mV/ILED
/SHDN
Shutdown Pin.
Connect to 1.5V or higher to enable device; 0.4V or less to disable device.
4
VIN
Input Supply Pin.
Must be locally bypassed.
5
PT6937 V1.1
-3-
March, 2006