TDA3604Q datasheet(14/20 Pages) PHILIPS

14 / 20 page

1997 Aug 21

Philips Semiconductors

Product speciﬁcation

Multiple voltage regulators with external

reset delay and switch

TDA3604Q; TDA3604TH

SHORT CIRCUIT BEHAVIOUR OF POWER SWITCH

The short circuit behaviour of the switch with large

inductive loads (switch output goes out of the radio) can be

improved by replacing C2 (see Fig.7) by a larger

electrolytic capacitor of 10

µF/16 V. When the temperature

protection of the switch becomes active, due to a short

circuit of the switch, the behaviour will be improved.

When the switch is clamped an minimum output capacitor

of 10

µF is needed.

The power switch is not protected against ‘loss of ground’

condition (= short of the switch to ground with floating

ground pin of the TDA3604 itself). A ‘loss of ground’

situation can in practice only occur when the switch output

goes outside the car-radio box.

There is an application solution to protect against ‘loss of

ground’ (see Fig.8).

It is advisable to limit the dissipation at short circuit

condition by monitoring the output of the power switch.

The microprocessor can switch of the power switch when

the switch was enabled and the switch output remains low

due to a short circuit condition.

Fig.8 ‘Loss of ground’ protection.

handbook, full pagewidth

MGL209

Vbat (+)

Vbat (−)

TDA3604Q

VI(sw), VP

2, 3

GND

VO(sw)

switch output

short circuit

to Vbat (−)

radio disconnected

from Vbat (−)

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