ML4863 Datasheet

IC型號(hào)：
ML4863
PDF描述：
Micro Linear Corporation [High Efficiency Flyback Controlle...
文件大小：
217.41KB
芯片廠家：
MICRO-LINEAR

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Extended C

mercial Tem

-20藲C to 70藲C uipment

Handheld E

for Portable

FEATURIN

erature Range

July 2000

ML4863*

High Efficiency Flyback Controller

GENERAL DESCRIPTION

The ML4863 is a flyback controller designed for use in

multi-cell battery powered systems such as PDAs and

notebook computers. The flyback topology is ideal for

systems where the battery voltage can be either above or

below the output voltage, and where multiple output

voltages are required.

The ML4863 uses the output voltage as the feedback

control signal to the current mode variable frequency

flyback controller. In addition, a synchronous rectifier

control output is supplied to provide the highest possible

conversion efficiency (greater than 85% efficiency over a

1mA to 1A load range).

The ML4863 has been designed to operate with a

minimum number of external components to optimize

space and cost.

FEATURES

Variable frequency current mode control and

synchronous rectification for high efficiency

Minimum external components

Guaranteed start-up and operation over a wide input

voltage range (3.15V to 15V)

High frequency operation (>200kHz) minimizes the

size of the magnetics

Flyback topology allows multiple outputs in addition to

the regulated 5V

Built-in overvoltage and current limit protection

*Some Packages Are Obsolete

BLOCK DIAGRAM

SHDN

VIN

VFB

4.5V

LDO

BIAS & UVLO

VFB

VCC

鈥?/div>

VFB

VREF

VCC

GND

OUT 1

CURRENT

COMPARATOR

鈥?/div>

COMP

SWITCHING

CONTROL

18mV

Rgm

18mV

鈥?/div>

COMP

RECTIFIER

COMPARATOR

BLANKING

VCC

CROSS-CONDUCTION

PROTECTION

OUT 2

SENSE

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