TS4890 datasheet(33/46 Pages) STMICROELECTRONICS

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TS4890

Application information

For the same power supply voltage, the output power in BTL configuration is four times

higher than the output power in single ended configuration.

5.2

Gain in typical application schematic

In flat region (no effect of Cin), the output voltage of the first stage is:

For the second stage: Vout2 = -Vout1 (V)

The differential output voltage is:

The differential gain named gain (Gv) for more convenient usage is:

Remark: Vout2 is in phase with Vin and Vout1 is 180 phased with Vin. It means that the

positive terminal of the loudspeaker should be connected to Vout2 and the negative to

Vout1.

5.3

Low and high frequency response

In low frequency region, the effect of Cin starts. Cin with Rin forms a high pass filter with a -

3 dB cut-off frequency.

In high frequency region, you can limit the bandwidth by adding a capacitor (Cfeed) in

parallel on Rfeed. Its form a low pass filter with a -3 dB cut-off frequency.

Pout

2Vout

RMS

()

------------------------------------ W

()

Vout1

Vin

Rfeed

Rin

-----------------

–

()

Vout2

Vout1

–

2Vin

Rfeed

Rin

----------------- V

()

Vout2

Vout1

–

Vin

----------------------------------------

Rfeed

Rin

-----------------

πRinCin

--------------------------- Hz

()

πRfeedCfeed

------------------------------------------ Hz

()

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