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CA3524 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer CA3524
Beschreibung Regulating Pulse Width Modulator
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 16 Seiten
CA3524 Datasheet, Funktion
October 2000
CA2524 IPSRAONDOUCBTSOLETE
CA1524, CA2524
CA3524
Regulating Pulse Width Modulator
Features
Description
• 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 0.5µs to 5µs
• Low VCE(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
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
CA1524E
CA1524F
CA2524E
CA2524F
CA3524E
CA3524F
TEMPERATURE
RANGE
PACKAGE
-55oC to +125oC 16 Lead Plastic DIP
-55oC to +125oC 16 Lead CerDIP
0oC to +70oC 16 Lead Plastic DIP
0oC to +70oC 16 Lead CerDIP
0oC to +70oC 16 Lead Plastic DIP
0oC to +70oC 16 Lead CerDIP
Pinout
CA1524, CA3524
(PDIP, CERDIP)
TOP VIEW
INV. INPUT
NON-
INV. INPUT
OSC OUT
(+) C.L.
SENSE
(-) C.L.
SENSE
RT
1
2
3
4
5
6
CT 7
GND 8
16 VREF
15 V+
14 EMITTER B
13 COLLECTOR B
12 COLLECTOR A
11 EMITTER A
10 SHUTDOWN
9 COMPENSATION
AND COMPARATOR
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 2000
1
File Number 1239.4






CA3524 Datasheet, Funktion
CA1524, CA2524, CA3524
Schematic Diagram (Continued)
A
OUTPUT A
B
OUTPUT B
Q33
COLL. A 12
EMIT A 11
R33
200 Q35
Q34
R32
1K
R31
4.7
R34
500
CA
1pF
Q36
D3
RE
500
R36
Q40 200
Q41
CB
1pF
Q39
D4
RF
500
R37
1K
R35
500
R38
4.7
Q37 Q38
13 COLL. B
14 EMIT B
C
R21
43.3K
NOR
NOR
R30
43.3K
D
E
R23
8.7K
R25 R26
5K 5K
R24 Q29
5K
R28
8.7K
Q26 Q30
R27
Q27 5K Q31
F
G
H
I
R52
1.96K
R54
1.96K
COMPARATOR
COMP
10 9
Q65
J
C3
45pF
R49
1K
R53
1.8K
Q64
Q63
R51
10K Q66
R50
10K
K
L
CURRENT
LIMIT
SECTION
5
(-) C.L.
SENSE
4
(+) C.L.
SENSE
Q67
Q68 Q70
Q68 Q71
Q72 Q73
6

6 Page









CA3524 pdf, datenblatt
CA1524, CA2524, CA3524
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 circuit
is accomplished by sensing current in the primary line and
resetting the soft-start circuit.
Push-Pull Converter
The output stages of the CA1524 provide the drive for
transistors Q1 and Q2 in the push-pull application of Figure
21. Since the internal flip-flop divides the oscillator frequency
by two, the oscillator must be set at twice the output
frequency. Current limiting for this circuit is done in the
primary of transformer T1 so that the pulse width will be
reduced if transformer saturation should occur.
Low-Frequency Pulse Generator
Figure 22 shows the CA1524 being used as a low-frequency
pulse generator. Since all components (error amplifier,
oscillator, oscillator reference regulator, output transistor
drivers) are on the lC, a regulated 5-V (or 2.5-V) pulse of 0%
- 45% (or 0% - 90%) on time is possible over a frequency
range of 150 to 500Hz. Switch S1 is used to go from a 5-V
output pulse (S1 closed) to a 2.5-V output pulse (S1 open)
with a duty cycle range of 0% to 45%. The output frequency
will be roughly half of the oscillator frequency when the
output transistors are not connected in parallel (75Hz to
250Hz, respectively). Switch S2 will allow both output stages
to be paralleled for an effective duty cycle of 0%-90% with
the output frequency range from 150 to 500Hz. The
frequency is adjusted by R1; R2 controls duty cycle.
V+
+5V
+
100µF
25K 5K
ΩΩ
5K
5K
2K
0.02µF
RURD620
+15V
115 300
1 112
21 111
116
CA3524
113
61 114
1M
200
0.1µF
50T 50µF
20T
50T
50µF
-15V
RURD620
2N6290
71 41
CORE: FEROX CUBE
2213P - A250 - 387
31 15
620
OR EQUIVALENT
IN914
110 19
510
+
18
2N2102
0.001µF 4.7µF
1
V+
+28V
5K
5K
5K
0.1µF
5K
0.01µF
2K
FIGURE 20. FLYBACK CONVERTER CIRCUIT
115
1K
1K
1W 1W 2N6292
1 112
21 111 1K
116 113
61 114 1K
71 41
2N6292
31 15
110 19
0.001µF
18 20K
0.1µF
RURD620 1mH
20T 5T
+
1500µF
5V
5A
5T
20T
RURD620
+
100µF
FIGURE 21. PUSH-PULL TRANSFORMER-COUPLED CONVERTER
12

12 Page





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