TDA7265
BRIDGE APPLICATION
Another application suggestion concerns the
BRIDGE configuration, where the two power am-
plifiers are connected as shown by the schematic
diagram of figure. 17.
This application shows, however, some operative
limits due to dissipation and current capability of
the output stage. For this reason, we reccomend
to use the TDA7265 in bridge with the supply volt-
age equal/lower than
±16V
when the load is 8Ω;
with higher loads (i.e.16
Ω
), the amplifier can work
correctly in the whole supply voltage range.
The detected characteristics of T.H.D. vs Pout
and Frequency Response are shown in fig.18 and
fig.19.
With R1=8Ω, Vs=+/-16V the maximum output
power obtainable is 50W at T.D.H.=10%.
The quiescent current remains unchanged with
respect to the stereo configuration (~80mA as
typical at Vs=+/-16V).
The last point to take into consideration concerns
the short-circuit protection. As for the stereo appli-
cation, the TDA7265 is fully protected against any
kind of short-circuit ( between Out/Gnd, Out/+Vs
and Out/-Vs).
Figure 17:
Bridge Application Circuit
ST-BY/
MUTE
C3
0.1µF
C1
IN
1µF
5
7
+
-
8
3
4
R1
36KΩ
R2
560Ω
R4
560Ω
R3
36KΩ
C8
5.6nF
C4
1000µF
R5 4.7Ω
+V
S
C7
0.1µF
9
RL
10
C2
11
-
+
1
6
2
1µF
R6
4.7Ω
-V
S
C6
1000µF
C9
0.1µF
D94AU190
C5
0.1µF
Figure 18:
Distortion vs. Output Power
Figure 19:
Frequency Response of the Bridge
Applications
9/11
STMICROELECTRONICS [ STMICROELECTRONICS ]
