HV9803 데이터 시트보기 (PDF) - Supertex Inc

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HV9803

LED Driver IC with Average-Mode Constant Current Control

Supertex Inc 

Supertex inc.

HV9803

LED Driver IC

with Average-Mode Constant Current Control

Features

►► Fast average current control

►► Correction for propagation delay and offset voltage

►► Fixed off-time switching mode

►► Linear dimming input

►► PWM dimming input

►► Output short circuit protection with programmable

skip mode

►► Input under-voltage shutdown

Applications

►► Backlighting of LCD Panels

General Description

The HV9803 is an open loop average-mode current control

LED driver IC operating in a constant off-time mode. The IC

features ±2% current accuracy, tight line and load regulation

of the LED current without any need for loop compensation

or high-side current sensing. Its auto-zero circuit cancels the

effect of both the input offset voltage and the propagation

delay in the current sense comparator.

The HV9803 can be powered from a 7.0~13.2V supply. The

IC features fast PWM dimming response. The linear dimming

input LD can accept a reference voltage up to 2.5V.

The IC is equipped with a current limit comparator for

hiccup-mode output short circuit protection. It also features a

programmable input under-voltage shutdown.

Typical Application Circuit

+VIN

7.0~13.2V

CIN

CDD

R1

DIM

REF

VDD

PWMD GATE

HV9803

LD

CS

CSKIP

R2

UVLO

RT

GND

RT

D1

L1

Q1

RCS

Doc.# DSFP-HV9803

NR012313

Supertex inc.

www.supertex.com

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