TDA7498E Datasheet, PDF (16/20 Pages) STMicroelectronics – 160-watt + 160-watt dual BTL class-D audio amplifier

Application information
5
Application information
TDA7498E
5.1
Stereo and mono BTL operation selection using the MODE
pin
The TDA7498E can be used in stereo applications or mono BTL applications. Connecting
the MODE pin to the VDDS pin configures the device in mono BTL. The output of the two
channels can be paralleled. When the MODE pin is connected to ground or floating (pulled
down internally) the device works as a stereo amplifier.
5.2
Gain setting
The gain of the TDA7498E is set by GAIN (pin 30).
Table 7. Gain settings
GAIN0
VGAIN < 0.25*VDDS
0.25*VDDS < VGAIN < 0.5*VDDS
0.5*VDDS < VGAIN < 0.75*VDDS
VGAIN > 0.75*VDDS
Total Gain
23.6 dB
29.6 dB
33.1 dB
35.6 dB
Application suggestion
GAIN pin connected to SGND
Rc10 = Rc11= Rc12 = 100 K max
Rc10 = Rc11 = Rc12 = 100K max
GAIN pin connected to VDDS
5.3
Smart protection
To avoid dynamic impedance drop, two overcurrent thresholds are set. The first threshold is
for the overcurrent limit. The device limits the output current to the first threshold but does
not shut down the PWM outputs.
If the device is shorted and at least one of the two output currents reaches the second
threshold, the device is shut down immediately. The device will recover automatically when
the fault is removed from the BTL outputs.
16/20
Doc ID 022595 Rev 1