HV9963NG-G Ver la hoja de datos (PDF) - Supertex Inc

Número de pieza

componentes Descripción

Fabricante

HV9963NG-G

Closed Loop LED Driver with Enhanced PWM Dimming

Supertex Inc 

HV9963

Closed Loop LED Driver with Enhanced PWM Dimming

Features

► Switch mode controller for single switch converters

● Buck

● Boost

● Buck-boost and SEPIC

► High output current accuracy

► High PWM dimming ratio (>5000:1)

► Internal 40V linear regulator

► Internal ±2% voltage reference

► Constant frequency operation with sync capability

► Programmable soft start

► 10V GATE drivers

► Hiccup mode protection for both short circuit and

open circuit conditions

Applications

► RGB or white LED backlighting

► Battery powered LED lamps

► Other DC/DC LED drivers

General Description

The HV9963 is a current mode control LED driver IC designed

to control single switch PWM converters (buck, boost,

buck-boost or SEPIC) in a constant frequency mode. The

controller uses a peak current-mode control scheme (with

programmable slope compensation) and includes an internal

transconductance amplifier to accurately control the output

current over all line and load conditions. Multiple HV9963s

can be synchronized to each other or to an external clock

using the SYNC pin. The IC also provides a disconnect switch

gate drive output, which can be used to disconnect the LEDs

in case of a fault condition using an external disconnect

FET. The 10V external FET drivers allow the use of standard

level FETs. The low voltage 5.0V AVDD is used to power the

internal logic and also acts as a reference voltage to set the

current level.

The HV9963 includes an enhanced PWM dimming logic (patent

pending) that enables very high PWM dimming ratios.

HV9963 also provides a TTL compatible, low-frequency 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 tens of

kilohertz.

Typical Application Circuit

D2 (optional)

CIN

CPVDD

D1

Q1

CSC

RCS

ROVP1

CO

ROVP2

VIN PVDD GT CS

OVP FLT

GND

HV9963

PWMD

HCP SYNC SS COMP RT

FB

IREF

AVDD

CHCP

CSS

CC

RT

RREF1

CAVDD

Q2

RS

RREF2

● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

Share Link: