HV9910CNG-G datasheet(1/18 Pages) MICROCHIP

Part #	HV9910CNG-G

Description	Universal High-Brightness LED Driver

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Manufacturer	MICROCHIP [Microchip Technology]

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DS20005323A-page 1

HV9910C

Features

• Switch mode controller for single switch LED drivers

• Enhanced drop-in replacement to the HV9910B

• Open loop peak current controller

• Internal 15 to 450V linear regulator

• Constant frequency or constant off-time operation

• Linear and PWM dimming capability

• Requires few external components for operation

• Over-temperature protection

Applications

• DC/DC or AC/DC LED driver applications

• RGB back-lighting LED driver

• Back lighting of flat panel displays

• General purpose constant current source

• Signage and decorative LED lighting

• Chargers

Description

HV9910C is an open-loop, current-mode control, LED

driver IC. This IC can be programmed to operate in

either a constant frequency or constant off-time mode.

It includes a 15 – 450V linear regulator which allows it

to work with a wide range of input voltages without the

need for an external low voltage supply. HV9910C

includes a TTL-compatible, 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 kilohertz. It

also includes a 0 – 250mV linear-dimming input which

can be used for linear dimming of the LED current.

Unlike the HV9910B, the HV9910C is equipped with

built-in thermal-shutdown protection.

HV9910C is ideally suited for buck LED drivers. Since

the HV9910C operates in open-loop current mode con-

trol, the controller achieves good output current regula-

tion without the need for any loop compensation. Also,

being

an

open-loop

controller,

PWM-dimming

response is limited only by the rate of rise of the induc-

tor current, enabling a very fast rise and fall times of the

LED current. HV9910C requires only three external

components (apart from the power stage) to produce a

controlled LED current. This makes HV9910C an ideal

solution for low-cost LED drivers.

Universal High-Brightness LED Driver

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