TDA7491P STMicroelectronics, TDA7491P Datasheet - Page 35

• Manufacturer Part Number: TDA7491P
• Description: IC, AMP, AUDIO, CLASS D, 36POWERSO
• Manufacturer: STMicroelectronics

Specifications of TDA7491P

• Amplifier Class: D
• No. Of Channels: 2
• Output Power: 10W
• Supply Voltage Range: 5V To 18V
• Thd + N: 0.1% @ 1W, 6ohm, VCC=11V
• Load Impedance: 8ohm
• Operating Temperature Range: 0°C To +70°C
• Rohs Compliant: Yes

TDA7491P
7.5
Filterless modulation
The output modulation scheme of the BTL is called unipolar pulse width modulation (PWM).
The differential output voltages change between 0 V and +V
This is in contrast to the traditional bipolar PWM outputs which change between +V
and -V
An advantage of this scheme is that it effectively doubles the switching frequency of the
differential output waveform. The OUTP and OUTN are in the same phase when the input is
zero, then the switching current is low and the loss in the load is small. In practice, a short
delay is introduced between these two outputs in order to avoid the BTL output switching at
the same time.
TDA7491P can be used without a filter before the speaker, because the frequency of the
TDA7491P output is beyond the audio frequency, the audio signal can be recovered by the
inherent inductance of the speaker and natural filter of the human ear.
Figure 54. Unipolar PWM output
CC
.
INP
INN
OUTP
OUTN
Differential
OUT
Doc ID 13540 Rev 4
CC
and between 0 V and -V
Applications information
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CC
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