TDA8385 查看數據表（PDF） - Philips Electronics

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TDA8385

Control circuit for a Self-Oscillating Power Supply (SOPS)

Philips Electronics 

Philips Semiconductors

Control circuit for a Self-Oscillating

Power Supply (SOPS)

Preliminary specification

TDA8385

BLOCK DIAGRAMS

handbook, full pagewidth

current reference

setting

feed forward

input

regulation indicator

output

differential amplifier

output

VP GND

16 14

3 I ref

REFERENCE

BLOCK

2

I ref

Vref

13 Vfo

latch

STABILIZED

SUPPLY

1

VP (min)

DETECTOR

reset

28

Vstab

SUPPLY REFERENCES

(28, 27, 23)

I

1 RIO

11 V diff

V ts

29

REGULATION

INDICATOR

X

7

Vmv

DIFFERENTIAL AMPLIFIER

Vref

(2.5 V)

V diff

V ts

3

feedback voltage

input

9 Vfb

transistor-on

setting input

4 Ton(min)

slow start voltage

input

7 Vss

50 µA

CLAMP

V TCG

TCG

2.5 V

4

MINIMUM

VOLTAGE

CLAMP 6

CONTROL PART III

5

Vss + Ton (min)

50 µA

charge

19

reset (28)

quick

discharge

27

SLOW START

VII

MCD417

Fig.1 Block diagram; part A (continued in Fig.2; part B).

March 1994

3

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