Microchip HV9931 Manual de Usario

Microchip No categorizado HV9931

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 2020 Microchip Technology Inc. DS20005733A-page 1

HV9931

Features

• Constant Output Current LED Driver

• 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 Pulse-Width Modulation (PWM) Dimming

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 buck-boost-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 85 VAC to 264 VAC input without 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 input and output

currents. This control technique eliminates the need for

loop compensation, limits the input inrush current, and

is inherently protected from Input Undervoltage

condition.

Capacitive isolation protects the LED Lamp from failure

of the switching MOSFET. The HV9931 provides a

low-frequency PWM dimming input that accepts an

external control signal with a duty ratio of 0% to 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.

Package Type

8-lead SOIC

(Top view)

See Table 2-1 for pin information.

VIN

CS1

GND

GATE

CS2

VDD

PWMD

Unity Power Factor LED Lamp Driver

HV9931

DS20005733A-page 2 2020 Microchip Technology Inc.

Functional Block Diagram

7.5V

VIN

CS1

CS2

PWMD

GATE

VDD

R Q

GND

HV9931

Regulator

Osc

Leading

Edge

Blanking

 2020 Microchip Technology Inc. DS20005733A-page 3

HV9931

Typical Application Circuit

VIN

GATE

CS1 CS2

VDD

PWMD

GND

REF2

REF1

CS1

CS2

L1 L2

Q1 D3

D1 D2

~AC

HV9931

~AC

Especificaciones del producto

Marca:	Microchip
Categoría:	No categorizado
Modelo:	HV9931
Color del producto:	Transparent, White
Amable:	Elektronisch
País de origen:	Engeland
No contiene:	Bisfenol A / BPA
Estuche de viaje:	Ja
voltaje-de-entrada-de-CA:	100-240 V
Edad (mín.):	0 maand(en)
Edad (máx.):	6 maand(en)