Datasheet > AC242E-F8A-G-LF-TR

AC242E-F8A-G-LF-TR

更新时间： 2022-12-01 19:04:52

品牌	Logo	应用领域
美高森美 - MICROSEMI		/
页数	文件大小	规格书
8页	201K
描述
Switching Controller

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Power Management AAC242/243

AAC242/243

PRELIMINARY DATA

Current Mode PWM Contoller

DESCRIPTION

The AAC242 and AAC243 are part of AAI’s new

family of specialty products for Power Management

applications. The AAC242 and AAC243 are high

performance integrated circuits designed for Off-line

or DC to DC converters using peak current mode

control. The AAC24X has a current sense of 250mV

in comparison to 1V for AAC14X parts.

In offline AC designs the startup is improved by the

low start-up current of the family. The integrated

soft-start function adds to the easy of using the

AAC24X parts in offline applications.

FEATURES

•

Low Start-up current

Pulse by pulse current limiting

The AAC242 and AAC243 are identical except for the

Under Voltage Lockout. The AAC242 has UVLO_on

threshold of 16V and off of 10V making it easy to use

in offline supplies where startup requirements for

energy storage is necessary. For applications using

lower supply voltages the AAC243 has UVLO_onof

8.4V and UVLO_offof 7.6V.

On board voltage reference

Under Voltage Lockout with hysteresis

Simple oscillator circuit

Over Voltage protection zener

High current output driver

Less than 30ns rise and fall times

Operation to over 1MHz

The AAC24X family is offered in DIP and SMD

packages. The packages are industry standards and

are ROHS compliant.

Extended temperature is

Peak Current Mode control

standard with the AAC24X family.

Integrated Soft-Start Function (~330 Clock

Cycles)

The greater than 1A output driver is ideal for driving

MOSFETs and low power IGBTs. Rise and fall times

are typically less that 30ns with a 1000pF load. The

improvements in switching speed can provide

improvements in efficiency, higher operating

frequency and over current protection.

•

100ns leading edge current blanking for reduced

filtering

250mV current sense

PIN CONFIGURATION: 8-Lead DIP and SOIC8

The AAC24X family has a minimum pulse width of

0.4% allowing operation at very low power without

pulse skipping or erratic operation. The narrower

pulse width capibilities enhances operation at higher

frequencies and voltages.

View of the AAC24X shown from the top.

COMP 1 8 VREF

AAC242

AAC243

Rt/Ct 4 5 GND

VFB

VCC

OUT

ISENSE

–

AADS00012 / R127B

Preliminary

October 2010 1 / 8

12 3 4 5 6 7 8

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