TS4871DT 데이터 시트보기 (PDF) - STMicroelectronics

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TS4871DT

OUTPUT RAIL TO RAIL 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE

STMicroelectronics 

TS4871

CIN = -------------1---------------- = 795nF

2π RinFCL

which gives 16Hz.

In Higher frequency we want 20kHz (-3dB cut off

frequency). The Gain Bandwidth Product of the

TS4871 is 2MHz typical and doesn’t change when

the amplifier delivers power into the load.

The first amplifier has a gain of:

R----R-f--e--i--ne----d-- = 3

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:

C FEED = -2---π------R-----F--1-E----E---D----F----C----H- = 265pF

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.

Remark : components with (*) marking are

optional.

Application n°1 : 20Hz to 20kHz bandwidth and

6dB gain BTL power amplifier.

Components :

Designator

R1

R4

R6

R7

R8*

C5

C6

C7

C9

C10

C12

S1, S2, S6, S7

S8

P1

D1*

U1

Part Type

22k / 0.125W

22k / 0.125W

Short Cicuit

330k / 0.125W

(Vcc-Vf_led)/If_led

470nF

100µF

100nF

Short Circuit

Short Circuit

1µF

2mm insulated Plug

10.16mm pitch

3 pts connector 2.54mm

pitch

PCB Phono Jack

Led 3mm

TS4871ID or TS4871IS

Application n°2 : 20Hz to 20kHz bandwidth and

20dB gain BTL power amplifier.

Components :

Designator

R1

R4

R6

R7

R8*

C5

C6

C7

Part Type

110k / 0.125W

22k / 0.125W

Short Cicuit

330k / 0.125W

(Vcc-Vf_led)/If_led

470nF

100µF

100nF

23/28

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