H9931 데이터 시트보기 (PDF) - Supertex Inc

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H9931

Unity Power Factor LED Lamp Driver

Supertex Inc 

HV9931

HV9931 Unity Power Factor LED Lamp Driver

Features

► Constant output current

► Large step-down ratio

► Unity power factor

► Low Input current harmonic distortion

► Fixed frequency or fixed off-time operation

► Internal 450V linear regulator

► Input and output current sensing

► Input current limit

► Enable, PWM and phase dimming

Applications

► Offline LED lamps and fixtures

► Street lamps

► Traffic signals

► Decorative lighting

General Description

The HV9931 is a fixed frequency PWM controller IC designed

to control an LED lamp driver using a single-stage PFC

buckboost-buck topology. It can achieve a unity power factor

and a very high step-down ratio that enables driving a single

high-brightness LED from the 85-264VAC input without a

need for a power transformer. This topology allows reducing

the filter capacitors and using non-electrolytic capacitors to

improve reliability. The HV9931 uses open-loop peak current

control to regulate both the input and the output current. This

control technique eliminates a need for loop compensation,

limits the input inrush current, and is inherently protected from

input under-voltage condition.

Capacitive isolation protects the LED Lamp from failure of the

switching MOSFET. HV9931 provides a 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 kilohertz.

The PWM dimming capability enables HV9931 phase control

solutions that can work with standard wall dimmers.

Typical Application Circuit

VIN

D4

~AC ~AC

CIN

RS1

Rref1

RCS1

D1

L1

C1

D2

L2

-

D3

Q1

VO

RS2

+

RCS2

RT

VIN

RT

GATE PWMD

Rref2

CS1

CS2

GND

VDD

C2

HV9931

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