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參數(shù)資料
| 型號： | CA3524F |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Regulating Pulse Width Modulator |
| 中文描述： | 0.1 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, CDIP16 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 206K |
| 代理商： | CA3524F |
11
CA1524, CA2524, CA3524
Applications
(Note 1)
A capacitor-diode output filter is used in Figure 19 to convert
+15V
DC
to -5V
DC
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
+15V
DC
to -5V
DC
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
1
CA3524
1
1
16
1
1
1
1
10
12
11
13
14
1
1
1
1
1
+15V
V+
5K
2K
0.1
μ
F
5K
R1
5K
0.01
μ
F
0.01
μ
F
R2
15K
IN4001
IN4001
20
μ
F
IN4001
50
μ
F
-5V
20mA
R1 = 5K
R2 =
R1 ( | V
O
| + 2.5)
(V
REF
- 2.5)
1
1
CA3524
1
1
16
1
1
1
1
10
12
11
13
14
1
1
1
1
1
15
+28V
V+
5K
3K
0.1
μ
F
5K
0.02
μ
F
0.001
μ
F
R2
5K
RURD410
V-
50K
0.1
500
μ
F
0.9mH
Q1
2N6388
2K
+5V IA
R1
5K
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