CFEED= 1

2πRFEEDFCH=265pF

So, we could use for Cfeed a 220 pF capacitor value that gives 24 kHz.

Now, we can calculate the value of Cb with the formula τb = 50 kΩ x Cb >> τin = (Rin+Rfeed) x Cin which permits

to reduce the pop and click effects.

Then Cb >> 0.8 μF.

We can choose for Cb a normalized value of 2.2 μF 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.

Remark : components with (*) marking are optional.

5.8

Application n°1 : 20 Hz to 20 kHz bandwidth and 6 dB gain BTL power amplifier

Table 7. Components

Designator

Part type

R1

22 k / 0.125 W

R4

22 k / 0.125 W

R6

Short-circuit

R7

330 k / 0.125 W

R8*

(Vcc-Vf_led) / If_led

C5

470 nF

C6

100 µF

C7

100 nF

C9

Short-circuit

C10

Short-circuit

C12

1 µF

S1, S2, S6, S7

2 mm insulated plug 10.16 mm pitch

S8

3 pt connector 2.54 mm pitch

P1

PCB phono Jack

D1*

LED 3 mm

U1

TS4871IS

TS4871

Application information

DS2547 - Rev 10

page 28/42