March 1994

11

Philips Semiconductors

Preliminary specification

Control circuit for a Self-Oscillating

Power Supply (SOPS)

TDA8385

Stand-by circuit (Block IX)

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).

Fig.11 Stand-by operation; burst mode.

handbook, full pagewidth

MCD410

t

0

output sub-section 25

t

0

t

0

V

sb

(V)

I LED

(mA)

5 mA

2.5 V

2 V