TDA7292 Datasheet, PDF (14/22 Pages) STMicroelectronics – 40 W + 40 W stereo amplifier with mute and standby

Applications information
5
Applications information
TDA7292
Warning: SOA protection:
If the TDA7292 is operated without a load connected to the
output terminals, the SOA protection circuit could be
activated when a high amplitude and high frequency signal is
applied to the input.
The frequency and amplitude of the signal able to trigger the
protection is a function also of the supply voltage level used.
If the above mentioned condition is possible when the
speakers are not connected, it is recommended to connect
the input to ground or add a dummy resistive load. For
example, a 1-kΩ / 1-W resistor can be used at Vcc = ±26 V. If a
lower supply voltage is used, the resistor value must be
decreased accordingly.
5.1
Applications with dual supply
Figure 18. Test and applications circuit (dual supply)
R2
A
R1
Q1
B
SW1
ST-BY ^DZ
C3
MUTE/
ST-BY ₅
IN (L) 7
C1
R4
R3
SW2 ^{A B}
MUTE
GND 9
C2
IN (R) 11
SW1 position
B
B
A
A
SW2 position
A
B
A
B
Mode
Standby
Standby
Mute
Play
D94AU087B
+V_S
+V_S
3
C4
C5
+
4 OUT (L)
-
R5
R7
8 IN- (L)
C8
R6
10 IN- (R)
R9
R8
-
2 OUT (R)
+
R10
1
6
-V_S
C9
C7
C6
RL (L)
RL (R)
14/22
Doc ID 15775 Rev 5