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CA3524E 数据表(PDF) 11 Page - Intersil Corporation

部件名 CA3524E
功能描述  Regulating Pulse Width Modulator
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

CA3524E 数据表(HTML) 11 Page - Intersil Corporation

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11
CA1524, CA2524, CA3524
Applications (Note 1)
A capacitor-diode output filter is used in Figure 19 to convert
+15VDC to -5VDC at output currents up to 50mA. Since the
output transistors have built-in current limiting, no additional
current limiting is needed. Table 1 gives the required
minimum input voltage and feedback resistor values, R2, for
an output voltage.
Capacitor-Diode Output Circuit
A capacitor-diode output filter is used in Figure18 to convert
+15VDC to -5VDC at output currents up to 50mA. Since the
output transistors have built-in current limiting, no additional
current limiting is needed. Table 1 gives the required
minimum input voltage and feedback resistor values, R2, for
an output voltage range of -0.5V to -20V with an output
current of 40mA.
Single-Ended Switching Regulator
The CA1524 in the circuit of Figure 19 has both output
stages connected in parallel to produce an effective 0% -
90% duty cycle. Transistor Q1 is pulsed on and off by these
output stages. Regulation is achieved from the feedback
provided by R1 and R2 to the error amplifier which adjusts
the on-time of the output transistors according to the load
current being drawn. Various output voltages can be
obtained by adjusting R1 and R2. The use of an output
inductor requires an R-C phase compensation network to
stabilize the system. Current limiting is set at 1.9 amperes by
the sense resistor R3.
NOTE:
1. For additional information on the application of this device and a
further explanation of the circuits below, see Intersil Application
Note AN6915 “Application of the CA1524 series PWM lC”.
FIGURE 18. CAPACITOR-DIODE OUTPUT CIRCUIT
FIGURE 19. SINGLE-ENDED LC SWITCHING REGULATOR CIRCUIT
1
CA3524
1
1
2
1
16
1
6
1
7
1
3
1
10
1
12
1
11
1
13
1
14
1
4
1
5
1
9
1
8
1
6
+15V
V+
5K
2K
0.1
µF
5K
R1
5K
0.01
µF
0.01
µF
R2
15K
IN4001
IN4001
20
µF
IN4001
50
µF
-5V
20mA
R1 = 5K
R2 =
R1 ( | VO | + 2.5)
(VREF - 2.5)
1
CA3524
1
1
2
1
16
1
6
1
7
1
3
1
10
1
12
1
11
1
13
1
14
1
4
1
5
1
9
1
8
1
15
+28V
V+
5K
3K
0.1
µF
5K
0.02
µF
0.001
µF
R2
5K
RURD410
V-
50K
0.1
500
µF
0.9mH
Q1
2N6388
2K
+5V IA
R1
5K


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