LD7890

11/5/2013

1

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7890-DS-01 November, 2013

High Voltage 4-Channel LED Controller Driver

REV: 01

General Description

The LD7890 is a 4-channel LED controller with a boost

switching controller

. It’s an ideal solution for driving high

power LED backlights. The LD7890 can deliver high

accuracy of constant current to 4 individual LED strings

with 4 External MOSFET without cross-reference.

The

LD7890

is

designed

for

Current-Mode

Boost

Controller, capable to operate over a wide range VIN from

9V to 28V and build in the High voltage MOSFET gate to

reduce external Power MOSFET thermal issue.

The other features include LED short and open protection,

cycle by cycle current limit, and thermal shutdown.

Features

Applications

Typical Application

33uF

R1

R2

NMOS

Gate3

PARL

OVP

RT

EN

CS

DRV

LOSC

Gate4

GND

DIM

STATUS

COMP

VIN

Gate2

Gate1

Cin

EN

PWM

VIN

LD7890

10V

Sense3

Sense4

Sense2

Sense1

FB3

FB4

FB2

FB1

G4

G3

S4

S3

D4

D3

G3

S3

D3

G4

S4

D4

5V

OVP

OVP

Fig. 1

Application circuit for 4 strings of LED light bar with External PWM