CA2524F Ver la hoja de datos (PDF) - Intersil

Número de pieza

componentes Descripción

Fabricante

CA2524F

Regulating Pulse Width Modulator

Intersil 

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”.

V+

+15V

5KΩ

R2

15KΩ

1

5KΩ

0.1µF

2KΩ

R1 21

5KΩ

116

61

71

0.01µF

31

110

61

CA3524

18

112

IN4001

111

20µF

113

IN4001

114

41

IN4001

15

19

0.01µF

-5V

20mA

50µF

R1 = 5KΩ

R2 = R1 ( | VO | + 2.5)

(VREF - 2.5)

FIGURE 18. CAPACITOR-DIODE OUTPUT CIRCUIT

V+

+28V

R2

5KΩ

R1

5KΩ

5KΩ

1

0.1µF

5KΩ

21

116

3KΩ

61

71

0.02µF

31

110

V-

115

CA3524

18

2N6388

112

Q1

111

2KΩ

113

114

41

15

19

0.001µF

50KΩ

0.9mH

+5V IA

500µF

RURD410

0.1Ω

FIGURE 19. SINGLE-ENDED LC SWITCHING REGULATOR CIRCUIT

11

Share Link: