CM494 Datasheet, PDF (2/9 Pages) List of Unclassifed Manufacturers – ADVANCED REGULATING PULSE WIDTH MODULATOR

CM494
ADVANCED REGULATING PULSE WIDTH MODULATOR
GENERAL DESCRIPTION
FEATURES
This of PWM modulator provides a complete pulse width !
modulation system in a single monolithic integrated circuit. !
This device includes a 5V reference accurate to ±1%, two !
independent amplifiers usable for both voltage and current !
sensing, an externally synchronizable oscillator with its
!
linear ramp generator, and two-uncommitted transistor
!
output switches. These two outputs may be operated
!
either in parallel for single-ended operation or alternating !
for push-pull applications with an externally controlled
dead-band. This unit is internally protected against
double-pulsing of a single output or from extraneous
output signals when the input supply voltage is below
minimum.
The CM494 contains an on-chip 39V zener diode for
high-voltage applications where Vcc would be greater
than 40V, and a buffered output steering control that
overrides the internal control of the pulse steering flip-flop.
Dual uncommitted 40V, 200mA output transistors.
1% accurate 5V reference.
Dual error amplifiers.
Wide range, variable dead time.
Single-ended or push-pull operation.
Under-voltage lockout with hysteresis.
Double pulse protection.
Master or slave oscillator operation.
APPLICATIONS
! Linear Regulators
! Adjustable Supplies
! Switching Power Supplies
! Battery Operated Computers
! Instrumentation
! Computer Disk Drives
PIN CONFIGURATION
16-PIN PDIP/SOP
(Top View)
1
1IN+
2IN+
16
2
1IN-
2IN-
15
3
FEEDBACK
REF
14
4
DTC
OUTPUT CTRL
13
5
CT
VCC
12
6
RT
C2
11
7
GND
E2
10
8
C1
E1
9
2000/12/29 Preliminary
Champion Microelectronic Corporation
Page 1