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PDF TDA8565Q Data sheet ( Hoja de datos )
| Número de pieza | TDA8565Q | |
| Descripción | 4 x 12 W single-ended car radio power amplifier with diagnostic interface | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA8565Q
4 × 12 W single-ended car radio
power amplifier with diagnostic
interface
Product specification
Supersedes data of November 1994
File under Integrated Circuits, IC01
1995 Dec 08
1 page  
Philips Semiconductors
4 × 12 W single-ended car radio
power amplifier with diagnostic interface
Product specification
TDA8565Q
Diagnostic output (pin 16)
DYNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin 16
goes LOW. This information can be used to drive a sound
processor or DC volume control to attenuate the input
signal and thus limit the distortion. The output level of
pin 16 is independent of the number of channels that are
clipping (see Fig.4).
handbook, halfpage VO
0
MGA706
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.5).
The power dissipation in any short-circuit condition is
very low.
V16
VP
0
t
Fig.4 Distortion detector waveform.
TEMPERATURE DETECTION
When the virtual junction temperature Tvj 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 pagewidthcurrent
in
output
stage
V15
VP
short-circuit over the load
20 ms
1995 Dec 08
50 µs
Fig.5 Short-circuit waveform.
5
MGA707
t
t
5 Page 
Philips Semiconductors
4 × 12 W single-ended car radio
power amplifier with diagnostic interface
Product specification
TDA8565Q
50
handbook, full pagewidth
SVRR
(dB)
60
MLC399
70
80
(1)
90
100
10
10 2
10 3
10 4 f (Hz)
10 5
(1) Standby condition.
Fig.12 Ripple rejection as a function of frequency; VP = 14.4 V; Vripple = 2 V (p-p); Rs = 0 Ω.
30
handbook, full pagewidth
α cs
(dB)
40
MGA719
50
60
70
80
10
10 2
10 3
10 4 f (Hz)
10 5
1995 Dec 08
Fig.13 Channel separation as a function of frequency.
11
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