TDA8566Q Datasheet, PDF (4/12 Pages) NXP Semiconductors – 2 x 25 W BTL stereo car radio power amplifier with differential inputs and diagnostic outputs

Philips Semiconductors
2 × 25 W BTL stereo car radio power amplifier
with differential inputs and diagnostic outputs
Product specification
TDA8566Q
PINNING
SYMBOL PIN
DESCRIPTION
IN1+
IN1−
1 channel 1 input positive
2 channel 1 input negative
SGND
3 small signal ground
CLIP
4 clip-detection
V_P1
OUT1+
5 supply voltage 1
6 channel 1 speaker output positive
PGND1
7 channel 1 negative power supply
(ground)
OUT1−
n.c.
8 channel 1 speaker output negative
9 not connected
OUT2+
10 channel 2 speaker output positive
PGND2
11 channel 2 negative power supply
(ground)
OUT2−
V_P2
MODE
12 channel 2 speaker output negative
13 supply voltage 2
14 mode select switch
(stand-by/mute/operating)
DIAG
15 short-circuit and temperature
pre-warning diagnostic
IN2+
16 channel 2 input positive
IN2−
17 channel 2 input negative
handbook, halfpage
IN1+ 1
IN1− 2
SGND 3
CLIP 4
VP1 5
OUT1+ 6
PGND1 7
OUT1− 8
n.c. 9 TDA8566Q
OUT2+ 10
PGND2 11
OUT2− 12
VP2 13
MODE 14
DIAG 15
IN2+ 16
IN2− 17
MGD101
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
The TDA8566Q contains two identical amplifiers and can
be used for BTL applications. The gain of each amplifier is
fixed at 26 dB. Special features of this device are:
1. Mode select switch
2. Clip detection
3. Short-circuit diagnostic
4. Temperature pre-warning
5. Open-collector outputs
6. Differential inputs.
Mode select switch (pin 14)
• Standby: low supply current (< 100 µA)
• Mute: input signal suppressed
• Operating: normal on condition.
Since this pin has a very low input current (< 40 µA), a low
cost supply switch can be applied. To avoid switch-on
plops, it is advisable to keep the amplifier in the mute mode
for a period of ≥150 ms (charging the input capacitors at
pins 1, 2, 16 and 17). This can be realized by
microcontroller control or by an external timing circuit
(see Fig.7).
Clip detection (pin 4)
When clipping occurs at one or more output stages, the
dynamic distortion detector becomes active and pin 4
goes low. This information can be used to drive a sound
processor or DC volume control to attenuate the input
signal and so limit the level of distortion. The output level
of pin 4 is independent of the number of channels that are
being clipped. The clip detection circuit is disabled in a
short-circuit condition, so if a fault condition occurs at the
outputs, pin 4 will remain at a high level. The clip detection
waveforms are illustrated in Fig.3.
1998 Sep 23
4