TDA8562Q Datasheet, PDF (5/16 Pages) NXP Semiconductors – 4 x 12 W single-ended car radio power amplifier with dynamic distortion detector and diagnostic interface

Philips Semiconductors
4 x 12 W single-ended car radio power amplifier with
dynamic distortion detector and diagnostic interface
Product specification
TDA8562Q
SHORT-CIRCUIT PROTECTION
When a short-circuit occurs at one or more outputs to
ground or to the supply voltage, the output stages are
switched off until the short-circuit is removed and the
device is switched on again, with a delay of approximately
20 ms, after removal of the short-circuit. During this
short-circuit condition, pin 16 is continuously low.
When a short-circuit across the load of one or more
channels occurs the output stages are switched off during
approximately 20 ms. After that time it is checked during
approximately 50 µs to see whether the short-circuit is still
present. Due to this duty cycle of 50 µs/20 ms the average
current consumption during this short-circuit condition is
very low (approximately 40 mA).
During this short-circuit condition, pin 16 is low for 20 ms
and high for 50 µs (see Fig.4).
The power dissipation in any short-circuit condition is very
low.
handbook, halfpage ^VO
0
V16
VP
0
MGA706
t
Fig.3 Distortion detector waveform.
TEMPERATURE DETECTION
When the virtual junction temperature T_vj reaches 150 °C,
pin 16 will be active LOW.
OPEN COLLECTOR OUTPUT
Pin 16 is an open collector output, which allows pin 16 of
more devices being tied together.
handbook, full pagewidth^current
in
output
stage
V15
VP
short-circuit over the load
50 µs
20 ms
July 1994
Fig.4 Short-circuit waveform.
5
MGA707
t
t