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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

Stand-by circuit (Block IX)

During stand-by operation the voltage Vsb is supplied from the SOPS via thyristor TH1 (see Fig.16). In the stand-by state,

SOPS operates in a burst mode. When the voltage on pin 10 exceeds 2.5 V the LED driver is permanently activated. The

LED driver is released again if the voltage is below 2 V (see Fig.11).

handbook, full pagewidth

Vsb

(V)

2.5 V

2V

0

output sub-section 25

0

I LED

(mA)

0

t

t

5 mA

t

MCD410

Fig.11 Stand-by operation; burst mode.

March 1994

11

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