TDA8563 Philips Semiconductors, TDA8563 Datasheet - Page 5

• Manufacturer Part Number: TDA8563
• Description: 2 x 40 W/2 ohm stereo BTL car radio power amplifier with diagnostic facility
• Manufacturer: Philips Semiconductors

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Philips Semiconductors
S
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 12 is continuously low.
When a short-circuit across the load of one or both
channels occurs the output stages are switched off during
approximately 20 ms. After that time it is checked during
approximately 50 s to see whether the short-circuit is still
present. Due to this duty cycle of 50 s/20 ms the average
current consumption during this short-circuit condition is
very low (approximately 40 mA).
1997 Feb 20
HORT
2
amplifier with diagnostic facility
-
CIRCUIT PROTECTION
40 W/2
current
output
stage
V 12
in
V P
stereo BTL car radio power
short-circuit over the load
Fig.4 Short-circuit waveform.
50 s
5
During this short-circuit condition, pin 12 is low for 20 ms
and high for 50 s (see Fig.4).
The power dissipation in any short-circuit condition is
very low.
T
When the virtual junction temperature T
pin 12 will become continuously low.
O
Pin 12 is an open collector output, which allows pin 12 of
more devices being tied together.
EMPERATURE DETECTION
PEN COLLECTOR OUTPUT
20 ms
MGA722
TDA8563AQ
t
t
Product specification
vj
reaches 150 C,