TS19450

AC/DC WLED Driver with External MOSFET

Universal High Brightness

3/8

Version: A10

Block Diagram

Pin Description

Pin

Function

Description

1

VIN

This pin is the input of 8V~450V linear regulator

2

CS

This pin is the current sense pin used to sense the MOSFET current by means of an

external sense resistor. When this pin exceeds the low of either the internal 250mV

or the voltage at the LD pin, the GATE output goes low

3

GND

Ground return for all internal circuitry. This pin must be electrically connected to the

ground of the power train.

4

GATE

This pin is the output GATE driver for an external N-CH Power MOSFET

5

PWMD

This is the PWM dimming input of the IC. When this pin is pulled to GND, the Gate

Driver is turned off. When the pin is pulled high, the GATE driver operates normally.

6

VDD

This is the power supply pin for all internal circuits.

It must be bypassed with a low ESR capacitor to GND (≥0.1µF)

7

LD

This pin is the linear dimming input and sets the current sense threshold as long as

the voltage at the pin is less than 250mV (typ.)

8

RT

This pin sets the oscillator frequency. When a resistor is connected between RT and

GND, the IC operates in constant frequency mode. When the resistor is connected

between RT and GATE, the IC operates in constant off-time mode.