CMOS Current-Mode PWM Voltage Controller

Copyright  ANPEC Electronics Corp.

Rev. A.7 - Jan., 2003

APW38HC42A/3A/4A/5A

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

Features

General Description

The APW38HC4XA family are fixed frequency, high

performance, current-mode PWM controller with 1.2

A drive current capability. Undervoltage lockout cir-

cuitry allows the APW38HC42A and APW38HC44A

versions to start up at 14.5V and operate down to

9V, and the APW38HC43A and APW38HC45A ver-

sions start at 8.4V with operateion down to 7.6V. All

versions operate up to 24V. The ultra low start-up

current 25

µA (typical), and operating current 2mA

(typical) have been designed to improve the converter

efficiency. High output driving capability up to 1.2A

ensures the fast switching to minimize the switching

losses. The APW38HC4XA features a trimmed and

temperature compensated oscillator discharge cur-

rent and bandgap reference. APW38HC4XA is avail-

able in both 8-pin plastic DIP and SOP packages.

Applications

Supplies

, forward, and synchronous FET)

Ordering and Marking Information

APW 38HC4XA

Package Code

J : DIP - 8

K : SOP-8

Temp. Range

C : 0 to 70 C

I : -40 to 85 C

Handling Code

TU : Tube

TR : Tape & Reel

Lead Free Code

L : Lead Free Device

Blank : Original Device

°

Handling Code

Temp. Range

Package Code

°

X - 2/3/4/5

XXXXX - Date Code

APW 38HC4XA

XXXXX

APW 384XA J :

APW 38HC4XA

XXXXX

APW 384XA K :

X - 2/3/4/5

XXXXX - Date Code

Lead Free Code

Pin Description

ISNS

RT/CT

VDD

GND

COMP

FB

OUT

1

2

3

4

VREF

5

6

7

8