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TS1937

Boost (Step-up) WLED Driver

TSC Corporation 

Functional Block

TS1937

Boost (Step-up) WLED Driver

Pin Description

Pin

Function

1

SW

2

Ground

3

Feedback

4

CTRL

5

Input

Description

Switching Pin. This is the collector of the internal NPN power switch. Connect to

inductor and diode. Minimize the metal trace area connected to this pin to reduce

EMI.

Ground Pin. Connect directly to local ground plane.

Feedback Pin. Reference voltage is 95mV. Connect LEDs and a resistor at this pin.

LED current is determined by the resistance and CTRL voltage.

Shutdown Pin and Dimming Control Pin.

VCTRL > 1.8V generates full-scale LED current

VCTRL < 0.4V chip is off

Switching from 0.4V to 2.0V, PWM duty cycle controls the LED current

Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible

3/8

Version: C07

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