HV9910BNG-G データシートの表示（PDF） - Supertex Inc

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HV9910BNG-G

Universal High Brightness LED Driver

Supertex Inc 

HV9910B

Universal High Brightness

LED Driver

Features

► Switch mode controller for single switch LED drivers

► Enhanced drop-in replacement to the HV9910

► Open loop peak current controller

► Internal 8.0 to 450V linear regulator

► Constant frequency or constant off-time operation

► Linear and PWM dimming capability

► Requires few external components for operation

Applications

► DC/DC or AC/DC LED driver applications

► RGB backlighting LED driver

► Back lighting of flat panel displays

► General purpose constant current source

► Signage and decorative LED lighting

► Chargers

General Description

The HV9910B is an open loop, current mode, control LED

driver IC. The HV9910B can be programmed to operate in

either a constant frequency or constant off-time mode. It

includes an 8.0 - 450V linear regulator which allows it to work

from a wide range of input voltages without the need for an

external low voltage supply. The HV9910B includes a 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.

The HV9910B is ideally suited for buck LED drivers. Since

the HV9910B operates in open loop current mode control, the

controller achieves good output current regulation without the

need for any loop compensation. PWM dimming response is

limited only by the rate of rise and fall of the inductor current,

enabling very fast rise and fall times. The HV9910B requires

only three external components (apart from the power stage)

to produce a controlled LED current making it an ideal solution

for low cost LED drivers.

Typical Application Circuit

CIN

CDD

VIN

VDD

HV9910B

LD

GATE

PWMD

CS

RT GND

RT

D1

CO

L1

Q1

RCS

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