Application information

TDA7498E

16/20

Doc ID 022595 Rev 1

5

Application information

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).

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.

Table 7.

Gain settings

GAIN0

Total Gain

Application suggestion

VGAIN < 0.25*VDDS

23.6 dB

GAIN pin connected to SGND

0.25*VDDS < VGAIN < 0.5*VDDS

29.6 dB

Rc10 = Rc11= Rc12 = 100 K max

0.5*VDDS < VGAIN < 0.75*VDDS

33.1 dB

Rc10 = Rc11 = Rc12 = 100K max

VGAIN > 0.75*VDDS

35.6 dB

GAIN pin connected to VDDS