TS19450

AC/DC WLED Driver with External MOSFET

Universal High Brightness

1/8

Version: A10

SOP-8

General Description

The TS19450 is an open loop, current mode control LED driver IC. It can be programmed to operate in either a

constant frequency or constant off-time mode. It includes an 8V~450V linear regulator which allows it to work from a

wide range of input voltages without the need for an external low voltage supply. The TS19450 includes a PWM

dimming input that can accept an external control signal with a duty ratio of 0~100% and a frequency of up to a few

kHz. It also includes a 0~250mV linear dimming input which can be used for linear dimming of the LED current.

The TS19450 is ideally suited for buck LED drivers. Since it operates in open loop current mode control, the controller

achieves good output current regulation without the need for any loop compensation. PWM dimming response is

limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times. The TS19450

requires only free external components (apart from the power stage) to produce a controlled LED current making it and

ideal solution for low cost LED drivers.

Ordering Information

Part No.

Package

Packing

TS19450CS RL

SOP-8

2.5Kpcs / 13” Reel

Features

●

Switch mode controller for single switch LED drivers

●

Open loop peak current controller

●

Internal 8V~450V linear regulator

●

Constant frequency or constant off-time operation

●

Linear and PWM dimming capability

●

Requires few external components for operation

Application

●

DC/DC or AC/DC LED driver applications

●

RGB backlighting LED driver

●

Back lighting of flat panel displays

●

General purpose constant current source

●

Signage and decorative LED lighting

●

Charger

Typical Application Circuit

Absolute Maximum Rating

Parameter

Symbol

Limit

Unit

Input Voltage Range

-0.5 ~ +470

V

Internal Regulated Voltage

13.5

V

CS, LD, PWMD, Gate, RT to GND

V

Continuous Power Dissipation

630

mW

Storage Temperature Range

-65 to +150

Junction Temperature Range

-40 to +150

Thermal Resistance – Junction to Ambient

128

Pin Definition:

1. VIN

8. RT

2. CS

7. LD

3. GND

6. VDD

4. Gate

5. PWMD