TS4972 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TS4972' PDF : 30 Pages View PDF
TS4972
Application Information
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:
CFEED = 2----π------R-----F---1E----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.
Application n°1 : 20Hz to 20kHz bandwidth
and 6dB gain BTL power amplifier
Components:
Designator
Part Type
R1
R4
R6
R7
R8
C5
C6
C7
C9
C10
C12
S1, S2, S6, S7
S8
P1
22k / 0.125W
22k / 0.125W
Short Cicuit
100k / 0.125W
Short Circuit
470nF
100µF
100nF
Short Circuit
Short Circuit
1µF
2mm insulated Plug
10.16mm pitch
3 pts connector 2.54mm
pitch
SMB Plug
Application n°2 : 20Hz to 20kHz bandwidth
and 20dB gain BTL power amplifier
Components:
Designator
Part Type
R1
R4
R6
R7
R8
C5
C6
C7
C9
C10
C12
S1, S2, S6, S7
S8
P1
110k / 0.125W
22k / 0.125W
Short Cicuit
100k / 0.125W
Short Cicuit
470nF
100µF
100nF
Short Circuit
Short Circuit
1µF
2mm insulated Plug
10.16mm pitch
3 pts connector 2.54mm
pitch
SMB Plug
Application n°3 : 50Hz to 10kHz bandwidth
and 10dB gain BTL power amplifier
Components:
Designator
Part Type
R1
33k / 0.125W
R2
Short Circuit
R4
22k / 0.125W
R6
Short Cicuit
R7
100k / 0.125W
R8
Short Cicuit
C2
470pF
C5
150nF
C6
100µF
C7
100nF
C9
Short Circuit
24/30
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