APW38HC42A/3A/4A/5A
CMOS Current-Mode PWM Voltage Controller
Features
General Description
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Ultralow start-up current (25µA typical)
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 25µA (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.
Low operating current (2mA typical)
Fast output rise/fall times :
−15ns rise/10ns fall
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High output drive (1.2A peak current)
CMOS outputs with rail-to-rail swing
Current-mode operation up to 1MHz
Trimmed 5V bandgap reference
Pin-to-pin compatible with MIC38HC4X
Trimmed oscillator discharge current
UVLO with hysteresis
Low cross-conduction currents
Pin Description
Applications
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Current-mode , Off-line , Switched-mode Power
Supplies
1
2
8
7
COMP
FB
VREF
VDD
OUT
GND
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Current-mode , DC-to-DC converters
6
5
3
4
ISNS
Various converters ( step-down, step-up, flyback
, forward, and synchronous FET)
RT/CT
Ordering and Marking Information
Package Code
APW38HC4XA
J : DIP - 8
K : SOP-8
I : -40 to 85 C
TR : Tape & Reel
Blank : Original Device
Temp. Range
Lead Free Code
Handling Code
°
°
C : 0 to 70 C
Handling Code
TU : Tube
Temp. Range
Package Code
Lead Free Code
L : Lead Free Device
X - 2/3/4/5
XXXXX - Date Code
APW38HC4XA
APW384XA J :
APW384XA K :
XXXXX
APW38HC4XA
XXXXX
X - 2/3/4/5
XXXXX - Date Code
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.
Copyright ANPEC Electronics Corp.
Rev. A.7 - Jan., 2003
1
www.anpec.com.tw