CA3524F Intersil Corporation, CA3524F Datasheet

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CA3524F

Manufacturer Part Number
CA3524F
Description
Regulating pulse width modulator
Manufacturer
Intersil Corporation
Datasheet

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Part Number
Manufacturer
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Price
Part Number:
CA3524F
Manufacturer:
AT&T
Quantity:
6 224
Part Number:
CA3524F
Manufacturer:
INTERS
Quantity:
64
October 2000
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
Features
• Complete PWM Power Control Circuitry
• Separate Outputs for Single-Ended or Push-Pull
• Line and Load Regulation . . . . . . . . . . . . . . . 0.2% (Typ)
• Internal Reference Supply with 1% (Max) Oscillator
• Standby Current of Less Than 10mA
• Frequency of Operation Beyond 100kHz
• Variable-Output Dead Time of 0.5 s to 5 s
• Low V
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
Pinout
Operation
and Reference Voltage Variation Over Full
Temperature Range
CE(sat)
Over the Temperature Range
|
Copyright
©
Intersil Corporation 2000
INV. INPUT
INV. INPUT
OSC OUT
(+) C.L.
SENSE
SENSE
(-) C.L.
NON-
GND
C
R
T
T
1
2
3
4
5
6
7
8
CA1524, CA3524
(PDIP, CERDIP)
TOP VIEW
1
CA1524, CA2524
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
CA1524E
CA1524F
CA2524E
CA2524F
CA3524E
CA3524F
NUMBER
PART
Regulating Pulse Width Modulator
16
15
14
13
12
11
10
9
V
V+
EMITTER B
COLLECTOR B
COLLECTOR A
EMITTER A
SHUTDOWN
COMPENSATION
AND COMPARATOR
REF
TEMPERATURE
-55
-55
0
0
0
0
o
o
o
o
o
o
C to +70
C to +70
C to +70
C to +70
RANGE
C to +125
C to +125
o
o
o
o
C
C
C
C
o
o
C
C
CA3524
16 Lead Plastic DIP
16 Lead CerDIP
16 Lead Plastic DIP
16 Lead CerDIP
16 Lead Plastic DIP
16 Lead CerDIP
File Number
PACKAGE
1239.4

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CA3524F Summary of contents

Page 1

... Ordering Information PART NUMBER CA1524E CA1524F CA2524E CA2524F CA3524E CA3524F CA1524, CA3524 (PDIP, CERDIP) TOP VIEW V 16 INV. INPUT 1 NON INV ...

Page 2

Functional Block Diagram REFERENCE REGULATOR REF 3 OSC OUT +5V OSCILLATOR INV. INPUT ERROR AMP + 2 NON-INV. INPUT 1k 10 SHUTDOWN 10k 8 GND Test Circuit ...

Page 3

Specifications CA1524, CA2524, CA3524 Absolute Maximum Ratings Input Voltage (Between V and GND Terminals 40V IN Operating Voltage Range (V to GND ...

Page 4

Specifications CA1524, CA2524, CA3524 Electrical Specifications 20kHz, Unless Otherwise Stated. (Continued) PARAMETER Output Voltage T Amplifier Pole Pin 9 Shutdown Current External Sink COMPARATOR SECTION Duty Cycle % Each Output On Input Threshold Zero ...

Page 5

Schematic Diagram R1 R5 500 2.7K RC 10K 500 8 GND Q42 Q43 Q47 6 Q44 R T Q49 ...

Page 6

Schematic Diagram (Continued) A OUTPUT A B COLL Q34 R31 4.7 11 EMIT A C R21 43. R23 R24 8.7K Q26 Q27 COMP 45pF R49 1K Q64 Q63 ...

Page 7

Circuit Description Voltage Reference Section The CAl524 series contains an internal series voltage regu- lator employing a zener reference to provide a nominal 5-volt output, which is used to bias all internal timing and control circuitry. The output of this ...

Page 8

Figure 7. To synchronize two or more CAl524’s, one must be designated as master, with R C set for the correct period. Each ...

Page 9

Output Section The CA1524 series outputs are two identical n-p-n transistors with both collectors and emitters uncommitted. Each output transistor has antisaturation circuitry that enables a fast transient response for the wide range of oscillator frequencies. Current limiting of the ...

Page 10

S // MAX SENSE + FIGURE 14. FOLDBACK CURRENT-LIMITING CIRCUIT USED TO REDUCE POWER DISSIPATION SHORTED OUTPUT CONDITIONS ...

Page 11

Applications (Note 1) A capacitor-diode output filter is used in Figure 19 to convert +15V to -5V at output currents up to 50mA. Since the DC DC output transistors have built-in current limiting, no additional current limiting is needed. Table ...

Page 12

Flyback Converter Figure 20 shows a flyback converter circuit for generating a dual 15V output at 20mA from a 5V regulated line. Reference voltage is provided by the input and the internal reference generator is unused. Current limiting in this ...

Page 13

TO PIN 9 2K DUTY CYCLE 1 ADJUSTMENT R2 2 10K 50K FREQUENCY ADJUSTMENT 8 0.1 F 20K SILVER MICA FIGURE 22. LOW-FREQUENCY PULSE GENERATOR The Variable Switcher The circuit diagram of the ...

Page 14

Digital Readout Scale The CA1524 can be used as the driving source for an electronic scale application. The circuit shown in Figures 24 and 25 uses half (Q2) of the CA1524 output in a low-voltage switching regulator (2.2V) application to ...

Page 15

PL1 TO SCALE S MECHANISM PL2 39K 430K 30K 2N4037 9V 200 4. CA1524 4. 6.2K 4.7K 4700pF 4.7K FIGURE 26. SCHEMATIC DIAGRAM ...

Page 16

... All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reli- able. However, no responsibility is assumed by Intersil or its subsidiaries for its use ...

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