HA17524P Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA17524P

Switching Regulator Controller

Hitachi -> Renesas Electronics 

HA17524P/FP

Push Pull Switching Regulator: Figure 12 shows the circuit configuration of push-pull switching regulator

that uses transformer. This system is suited for high power. Output transistors inside HA17524 can drive

external switching transistors.

5kΩ

5kΩ

0.1µF

2kΩ

0.01µF

VCC = 28V

5kΩ

VCC

INV.

Input

NON-INV.

5kΩ Input

VREF

1kΩ

1W

E1

C1

C2

RT

E2

CT

SHUT

DOWN

OSC Out

CL(+)

CL(–)

COMP

GND

1kΩ

1W

1kΩ

1kΩ

0.001µF

20kΩ

0.1Ω

20T

5T

20T

5T

+

− 100µF

1mH

1,500µF

+

− 5V, 5A

Figure 12 Push-Pull Switching Regulator

Note

Compared with conventional series regulators, switching regulators generate high frequency noise by

switching current quickly. To reduce noise

1. As a general rule, insert line filter to reduce noise at the input.

2. To reduce noise at the output:

a. Twist output wiring together.

b. Do not bundle power source and output wiring.

c. Insert capacitor should be inserted at the load side.

d. Ground the power frame.

3. When choosing external parts (external switching transistor, diode, coil, etc) consider their capacitance

and characteristics.

10

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