Microchip HV9982 Handleiding

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 2014 Microchip Technology Inc.DS20005295B-page 1

HV9982

Features

•Switch mode controller for single-switch convert-

ers

•Closed loop control of output current

- Buck

- Boost

- SEPIC

•High PWM dimming ratio

•Internal 40V linear regulator

•Constant frequency operation

•Programmable slope compensation

•Linear and PWM dimming

•+0.2A/-0.4A gate drives for the switching FETs

•Output short circuit protection

•Output over voltage protection

•Hiccup-mode protection

•Analog control of PWM dimming

Applications

•RGB backlight applications

•Multiple string, white-LED driver applications

Description

HV9982 is a three-channel, closed loop, peak-current

mode PWM controller designed to drive a constant out-

put current. It can be used for driving either RGB LEDs

or multiple channels of white LEDs.

HV9982 includes a 40V linear regulator which provides

an 8.0V supply to power the IC. The switching frequen-

cies of the three converters are controlled by an exter-

nal clock signal. The channels operate at a switching

frequency of 1/12th of the external clock frequency and

are positioned 120°out-of-phase to reduce the input

current ripple. Each converter is driven by a peak cur-

rent mode controller with output current feedback.

The three output currents can be individually dimmed

using either linear or PWM dimming. The IC also

includes three disconnect FET drivers, which enable

high PWM-dimming ratios and also help to disconnect

the input in case of an output short-circuit condition.

HV9982 includes a Hiccup-mode protection for both

open LED and short-circuit condition with automatic

recovery when the fault clears.

Three-Channel, Closed-Loop, Switch Mode

LED Drive IC

Product specificaties