TDA7492E Datasheet, PDF (11/24 Pages) STMicroelectronics – 79 W + 79 W dual BTL class-D audio amplifier

TDA7492E
Application information
4
4.1
Application information
Gain setting
The four gain settings of the TDA7492E are set by GAIN (pin 31). Internally, gain is set by
changing the feedback resistors of the amplifier.
Voltage on GAIN pin
Table 8: Gain settings
Total gain
Application recommendations
VGAIN < 0.25*VDDS
0.25*VDDS < VGAIN < 0.5*VDDS
0.5*VDDS < VGAIN < 0.75*VDDS
VGAIN > 0.75*VDDS
20.8 dB
26.8 dB
30 dB
32.8 dB
GAIN pin connected to SGND
External resistor divider <100 k
External resistor divider <100 k
GAIN pin connected to VDDS
4.2
Stereo and mono applications
The TDA7492E can be used in stereo BTL or in mono BTL configuration. When the input
pins, INPB and INNB of the right channel are directly shorted to VDDS (without input
capacitors) the device is in mono configuration as shown in Figure 3: "Mono BTL settings".
Figure 3: Mono BTL settings
INPA
INN A
INPB
INN B
OUTPB
OUTPA
IC
OUTNA
OUTNB
LC
Filter
4.3
4.3.1
Smart protections
Overcurrent protection (OCP)
If the overcurrent protection threshold is reached, the power stage will be shut down
immediately. The device will recover automatically when the fault is removed.
The overcurrent protection scheme is shown in Table 9: "Overcurrent protection". Two
typical thresholds are as follows.
Table 9: Overcurrent protection
I (Shutdown)
High side (A)
11.2
Low side (A)
10.0
DocID027638 Rev 1
11/24