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TS4872 数据表(PDF) 25 Page - STMicroelectronics

部件名 TS4872
功能描述  RAIL TO RAIL INPUT/OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE
PDF  29 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS4872 数据表(HTML) 25 Page - STMicroelectronics

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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 :
s Note on how to use the PSRR curves
(page 8)
We have finished a design and we have chosen
the components :
s Rin=Rfeed=22k
Ω
s Cin=100nF
s Cb=1
µF
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
1
µF
S1, S2, S6, S7
2mm insulated Plug
10.16mm pitch
S8
2 pts connector 2.54mm
pitch
J1
SMB Plug
U1
TS4872IJ
Designator
Part Type
R1
22k / 0.125W
R4
22k / 0.125W
R5
22k / 0.125W
R6
22k / 0.125W
R7
330k / 0.125W
C4
470nF
C5
470nF
Designator
Part Type
GVDIFF = 2
R1
R4
-------- (Pos. Input - Neg.Input)
C6
100
µF
C7
100nF
C9
Short Circuit
C10
Short Circuit
C12
1
µF
S1, S2, S6, S7
2mm insulated Plug
10.16mm pitch
S8
2 pts connector 2.54mm
pitch
J1, J3
SMB Plug
U1
TS4872IJ
Designator
Part Type



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