TS4872_05 datasheet(25/29 Pages) STMICROELECTRONICS

25 / 29 page

Obsolete

Product(s)

- Obsolete

Product(s)

TS4872

25/29

Application n°4 : Differential inputs BTL power

amplifier.

In this configuration, we need to place these

components : R1, R4, R5, R6, R7, C4, C5, C12.

We have also : R4 = R5, R1 = R6, C4 = C5.

The gain of the amplifier is :

For a 20Hz to 20kHz bandwidth and 6dB gain BTL

power amplifier you could follow the bill of material

below.

Components :

■ Note on how to use the PSRR curves

(page 8)

We have finished a design and we have chosen

the components :

■ Rin=Rfeed=22kΩ

■ Cin=100nF

■ Cb=1µF

Now, on fig. 13, we can see the PSRR (input

grounded) vs frequency curves. At 217Hz we have

a PSRR value of -36dB.

In reality we want a value about -70dB. So, we

need a gain of 34dB !

Now, on fig. 12 we can see the effect of Cb on the

PSRR (input grounded) vs. frequency. With

Cb=100

µF, we can reach the -70dB value.

The process to obtain the final curve (Cb=100µF,

Cin=100nF, Rin=Rfeed=22k

Ω) is a simple transfer

point by point on each frequency of the curve on

fig. 13 to the curve on fig. 12.

The measurement results is shown on figure 84.

C10

Short Circuit

C12

µF

S1, S2, S6, S7

2mm insulated Plug

10.16mm pitch

2 pts connector 2.54mm

pitch

SMB Plug

TS4872IJ

Designator

Part Type

22k / 0.125W

330k / 0.125W

470nF

Designator

Part Type

GVDIFF = 2

-------- (Pos. Input - Neg.Input)

100

µF

100nF

Short Circuit

C10

Short Circuit

C12

µF

S1, S2, S6, S7

2mm insulated Plug

10.16mm pitch

2 pts connector 2.54mm

pitch

J1, J3

SMB Plug

TS4872IJ

Designator

Part Type

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