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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright
Intersil Corporation 2000
CA1524, CA2524
CA3524
Regulating Pulse Width Modulator
Description
The CA1524 and CA3524 are silicon monolithic integrated
circuits designed to provide all the control circuitry for use in
a broad range of switching regulator circuits.
The CA1524 and CA3524 have all the features of the indus-
try types SG1524, SG2524, and SG3524, respectively. A
block diagram of the CA1524 series is shown in Figure 1.
The circuit includes a zener voltage reference, transconduc-
tance error amplifier, precision R-C oscillator, pulse-width
modulator, pulse-steering flip-flop, dual alternating output
switches, and current-limiting and shutdown circuitry. This
device can be used for switching regulators of either polarity,
transformer-coupled dc-dc converter, transformerless volt-
age doublers, dc-ac power inverters, highly efficient variable
power supplies, and polarity converter, as well as other
power-control applications.
Ordering Information
PART
NUMBER
TEMPERATURE
RANGE
PACKAGE
CA1524E
-55
o
C to +125
o
C
16 Lead Plastic DIP
CA1524F
-55
o
C to +125
o
C
16 Lead CerDIP
CA2524E
0
o
C to +70
o
C
16 Lead Plastic DIP
CA2524F
0
o
C to +70
o
C
16 Lead CerDIP
CA3524E
0
o
C to +70
o
C
16 Lead Plastic DIP
CA3524F
0
o
C to +70
o
C
16 Lead CerDIP
Features
Complete PWM Power Control Circuitry
Separate Outputs for Single-Ended or Push-Pull
Operation
Line and Load Regulation. . . . . . . . . . . . . . . 0.2%(Typ)
Internal Reference Supply with 1% (Max) Oscillator
and Reference Voltage Variation Over Full
Temperature Range
Standby Current of Less Than 10mA
Frequency of Operation Beyond 100kHz
Variable-Output Dead Time of 0.5
μ
s to 5
μ
s
Low V
CE(sat)
Over the Temperature Range
Applications
Positive and Negative Regulated Supplies
Dual-Output Regulators
Flyback Converters
DC-DC Transformer-Coupled Regulating Converters
Single-Ended DC-DC Converters
Variable Power Supplies
File Number
1239.4
Pinout
CA1524, CA3524
(PDIP, CERDIP)
TOP VIEW
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
C
T
R
T
V
REF
EMITTER B
COLLECTOR B
COLLECTOR A
EMITTER A
SHUTDOWN
INV. INPUT
NON-
INV. INPUT
OSC OUT
(+) C.L.
SENSE
GND
(-) C.L.
SENSE
V+
COMPENSATION
AND COMPARATOR
October 2000
CA2524PRODUCT