CA3524E Intersil, CA3524E Datasheet - Page 11

• Manufacturer Part Number: CA3524E
• Description: REGUL. PULSE WIDTH MODULATOR
• Manufacturer: Intersil

Specifications of CA3524E

• Rohs Status: RoHS non-compliant
• Other names: CA3524

Applications
A capacitor-diode output filter is used in Figure 19 to convert
+15V
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
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.
DC
DC
to -5V
to -5V
+28V
DC
DC
V-
V+
+15V
0.1 F
0.1 F
at output currents up to 50mA. Since the
at output currents up to 50mA. Since the
5K
(Note 1)
5K
5K
V+
5K
R2
0.01 F
0.02 F
2K
3K
5K
FIGURE 19. SINGLE-ENDED LC SWITCHING REGULATOR CIRCUIT
R1
5K
R1
5K
R2
15K
1 16
1 16
1 10
1 10
1
1 2
1 6
1 7
1 3
1
1 2
1 6
1 7
1 3
1
1
FIGURE 18. CAPACITOR-DIODE OUTPUT CIRCUIT
CA1524, CA2524, CA3524
CA3524
CA3524
1 15
1 6
1 8
1 8
0.01 F
1 12
1 11
1 13
1 14
1 12
1 11
1 13
1 14
1 4
1 5
1 9
1 4
1 5
1 9
11
IN4001
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:
2N6388
1. For additional information on the application of this device and a
50K
0.001 F
further explanation of the circuits below, see Intersil Application
Note AN6915 “Application of the CA1524 series PWM lC”.
20 F
2K
IN4001
IN4001
Q1
50 F
RURD410
0.9mH
0.1
R1 = 5K
R2 =
-5V
20mA
R1 ( | V
(V
REF
500 F
O
+5V IA
- 2.5)
| + 2.5)