ml4833 Microsemi Corporation, ml4833 Datasheet

ml4833

Manufacturer Part Number

ml4833

Description

Electronic Dimming Ballast Controller

Manufacturer

Microsemi Corporation

Datasheet

1.ML4833.pdf (13 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

ml4833CS

Manufacturer:

MICROLINEAR

Quantity:

20 000

Current page: 1 of 13
Download datasheet (270Kb)

GENERAL DESCRIPTION

The ML4833 is a complete solution for a dimmable or a

non-dimmable, high power factor, high efficiency

electronic ballast. The BiCMOS ML4833 contains

controllers for “boost” type power factor correction as

well as for a dimming ballast. The ML4833 was designed

to minimize the number of external components required

to build an electronic ballast.

The PFC circuit uses a new, simple PFC topology which

requires only one loop for compensation. This system

produces a power factor of better than 0.99 with low

input current THD. An overvoltage protection comparator

inhibits the PFC section in the event of a lamp out or lamp

failure condition.

The ballast controller section provides for programmable

starting sequence with individually adjustable preheat and

lamp out-of-socket interrupt times. The IC controls lamp

output power through feedback. The ML4833 provides a

power down input which reduces power to the lamp, for

GFI, end of life, etc.

BLOCK DIAGRAM

PDWN

PIFB

PEAO

PVFB/OVP

SET

RAMP

VARIABLE FREQUENCY

AND INTERRUPT

CONTROLLER

OSCILLATOR

PRE-HEAT

FACTOR

TIMERS

POWER

Electronic Dimming Ballast Controller

GATING LOGIC

FEATURES

CONTROL

UNDER-VOLTAGE

AND THERMAL

Complete power factor correction and dimming

ballast control in one IC

Low distortion, high efficiency continuous boost,

peak current sensing PFC section

Programmable start scenario for rapid or

instant start lamps

Lamp current feedback for dimming control

Variable frequency dimming and starting

Programmable restart for lamp out condition to

reduce ballast heating

Internal over-temperature shutdown replaces

external heat sensor

PFC overvoltage comparator eliminates output

“runaway” due to load removal

Low start-up current <0.5mA

Power reduction pin for end of life and GFI detectors

SHUTDOWN

OUTPUT

DRIVERS

INTERRUPT

PFC OUT

LFB OUT

LAMP FB

OUT A

OUT B

PGND

GND

VCC

ML4833*

REF

PRELIMINARY

July 2000

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