TS4972 datasheet(24/30 Pages) STMICROELECTRONICS

24 / 30 page

TS4972

Application Information

24/30

and the theoretical value of the -3dB cut-off higher

frequency is 2MHz/3 = 660kHz.

We can keep this value or limit the bandwidth by

adding a capacitor Cfeed, in parallel on Rfeed.

Then:

So, we could use for Cfeed a 220pF capacitor

value that gives 24kHz.

Now, we can calculate the value of Cb with the

formula

τb = 50kΩxCb >> τin = (Rin+Rfeed)xCin

which permits to reduce the pop and click effects.

Then Cb >> 0.8µF.

We can choose for Cb a normalized value of

2.2µF that gives good results in THD+N and

PSRR.

In the following tables, you could find three

another examples with values required for the

demoboard.

Application n°1 : 20Hz to 20kHz bandwidth

and 6dB gain BTL power amplifier

Components:

Application n°2 : 20Hz to 20kHz bandwidth

and 20dB gain BTL power amplifier

Components:

Application n°3 : 50Hz to 10kHz bandwidth

and 10dB gain BTL power amplifier

Components:

Designator

Part Type

22k / 0.125W

Short Cicuit

100k / 0.125W

Short Circuit

470nF

100µF

100nF

Short Circuit

C10

Short Circuit

C12

1µF

S1, S2, S6, S7

2mm insulated Plug

10.16mm pitch

3 pts connector 2.54mm

pitch

SMB Plug

C FEED =

π RFEEDFCH

--------------------------------------- = 265pF

Designator

Part Type

110k / 0.125W

22k / 0.125W

Short Cicuit

100k / 0.125W

Short Cicuit

470nF

100µF

100nF

Short Circuit

C10

Short Circuit

C12

1µF

S1, S2, S6, S7

2mm insulated Plug

10.16mm pitch

3 pts connector 2.54mm

pitch

SMB Plug

Designator

Part Type

33k / 0.125W

Short Circuit

22k / 0.125W

Short Cicuit

100k / 0.125W

Short Cicuit

470pF

150nF

100µF

100nF

Short Circuit

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