HV9989 datasheet(1/21 Pages) MICROCHIP

Part #	HV9989

Description	Three-Channel CCM/DCM Boost LED Driver

PDF	21 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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2014-2026 Microchip Technology Inc. and its subsidiaries

DS20005296C-page 1

HV9989

Features

• Three out-of-phase constant-current boost

converters

• Current loop closed, with sub-microsecond PWM-

dimming pulses, supports PWM dimming >20 kHz

• Internal 40V linear regulator

• External clock input

• External individual reference inputs

• Individual PWM dimming inputs

• Programmable slope compensation

• +0.2A/-0.4A gate drivers

• Independent short circuit protection with hiccup

for each channel

• Latching output open-circuit protection

Applications

• LCD panel back-lighting

Description

HV9989 is a three-channel peak current mode PWM

controller designed to drive single switch converters in

a constant-output current mode. It can be used for driv-

ing either RGB LEDs or multiple channels of white

LEDs.

HV9989 features a proprietary PWM-dimming control

algorithm that achieves a dimming pulse of a few hun-

dred nanoseconds from a Continuous-Conduction

Mode (CCM) or Discontinuous-Conduction Mode

(DCM) boost converter, while maintaining the instanta-

neous LED constant current determined by the external

reference voltage input. This feature permits a dimming

frequency outside of the audible range, and can also

yield a wide dimming ratio in excess of 10,000:1 at low

dimming frequency. Each of the three channels fea-

tures individual PWM-dimming and reference voltage

inputs.

The switching frequencies of the three converters are

controlled by an external clock signal, such that the

channels operate at a switching frequency of 1/12th the

external clock frequency, and are positioned 120° out-

of-phase to reduce the input current ripple.

HV9989 provides a full protection feature set, including

output-short and open-circuit protection, for each indi-

vidual channel that is independent from the other chan-

nels.

HV9989 is powered by a built-in 40V linear regulator.

Three-Channel CCM/DCM Boost LED Driver

with Sub-Microsecond PWM Dimming

Obsolete Device

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