Supertex inc.

HV9961

Supertex inc.

www.supertex.com

Features

Applications

General Description

The HV9961 is an average current mode control LED driver

IC operating in a constant off-time mode. Unlike HV9910B,

this control IC does not produce a peak-to-average error, and

therefore greatly improves accuracy, line and load regulation

of the LED current without any need for loop compensation or

high-side current sensing. The output LED current accuracy

is ±3%.

The IC is equipped with a current limit comparator for hiccup-

mode output short circuit protection.

The HV9961 can be powered from an 8.0 - 450V supply.

A PWM dimming input is provided that accepts an external

control TTL compatible signal. The output current can be

programmed by an internal 275mV reference, or controlled

externally through a 0 - 1.5V dimming input.

HV9961 is pin-to-pin compatible with HV9910B and it can

be used as a drop-in replacement for many applications to

improve the LED current accuracy and regulation.

Typical Application Circuit

LED Driver with Average-Mode

Constant Current Control

1

4

2

8

5

6

7

3

HV9961

VIN

GATE

PWMD

LD

VDD

RT

CS

GND

LED

Load

Sets

LED

Current

8.0 - 450VDC

R

CS

R

T