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REV.-A

I

I

Primary

I

I

1

I

1

Secondary

1

I

1

Full Wave

Rectification

— Smoothing

Switching

;

Smoothing

<

Circuit

Circuit

Circuit

I

Circuit

I

1

1

m

9

Filter Circuit

AC input

I

1

1

I

1

1

1

l------

1

I

1

1

I

I

I

I

1

I

1

1

I

1

1

t

1

+5

v

Switching

Regulator

. . . . . . . . . . . . . . .

.

+5V

Over Current

Control Circuit

----..-.....----

+5V

Over Voltage

Control Circuit

I

1

ZD51

Photo-

+35 V Line

coupler

+

Detector Circuit

I

8A

1

1

1

1

I

1

1

1

1

1

I

I

t

t

I

I

I

I

I

I

I

I

1

I

I

I

I

1

t

1

1

1

1

I

{

+5 V Line Voltage

ZD53

Photo-

+

Overload

coupler

Protection Circuit

-

—

.

—

+35 V Line

Voltage Drop

Protection Circuit

.

4 +35

VDC

+

+5 VDC

~

Switch

Figure 2-22. Power Supply Circuit Block Diagram

2-21