TDA8566 NXP Semiconductors, TDA8566 Datasheet - Page 7

• Manufacturer Part Number: TDA8566
• Description: The TDA8566 is an integrated class-B output amplifier which is available in severalpackages
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8566_6
Product data sheet
7.3 Short-circuit diagnostic (pin DIAG)
7.4 Temperature pre-warning (pin DIAG)
7.5 Open-collector diagnostic outputs
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 the removal of the short-circuit).
During this short-circuit condition, pin DIAG is continuously LOW.
When a short-circuit occurs across the load of one or both channels, the output stages are
switched off for approximately 20 ms. After that time the load condition 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 the short-circuit condition is very
low (approximately 40 mA). During this condition, pin DIAG is LOW for 20 ms and HIGH
for 50 s; see
When the virtual junction temperature (T
continuously LOW.
Pins DIAG and CLIP are open-collector outputs, therefore more devices can be tied
together. Pins DIAG and CLIP can also be tied together. An external pull-up resistor is
required.
Fig 5. Clip detection waveforms
Fig 6. Short-circuit diagnostic timing diagram
current
output
V
stage
DIAG
(V)
in
Figure
short-circuit over the load
6. The power dissipation in any short-circuit condition is very low.
Rev. 06 — 15 October 2007
V
V
(V)
CLIP
(V)
O
0
0
2
40 W/2
vj
50 s
) reaches 145 C, pin DIAG will become
stereo BTL car radio power amplifier
20 ms
mgu357
t (s)
TDA8566
© NXP B.V. 2007. All rights reserved.
t (s)
t (s)
mgu360
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