TS4872IJT View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TS4872IJT Datasheet PDF : 29 Pages
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TS4872
Designator
Part Type
Designator
Part Type
C10
Short Circuit
C6
100µF
C12
1µF
C7
100nF
S1, S2, S6, S7
S8
2mm insulated Plug
C9
10.16mm pitch
C10
2 pts connector 2.54mm
pitch
C12
Short Circuit
Short Circuit
1µF
J1
SMB Plug
U1
TS4872IJ
Application n°4 : Differential inputs BTL power
amplifier.
S1, S2, S6, S7
S8
J1, J3
2mm insulated Plug
10.16mm pitch
2 pts connector 2.54mm
pitch
SMB Plug
In this configuration, we need to place these
) components : R1, R4, R5, R6, R7, C4, C5, C12.
ct(s We have also : R4 = R5, R1 = R6, C4 = C5.
du The gain of the amplifier is :
Pro GVDIFF = 2 RR-----14-- (Pos. Input - Neg.Input)
lete For a 20Hz to 20kHz bandwidth and 6dB gain BTL
o power amplifier you could follow the bill of material
s below.
Ob Components :
) - Designator
t(s R1
uc R4
rod R5
P R6
te R7
ole C4
ObsC5
Part Type
22k / 0.125W
22k / 0.125W
22k / 0.125W
22k / 0.125W
330k / 0.125W
470nF
470nF
U1
TS4872IJ
■ 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=100µF, we can reach the -70dB value.
The process to obtain the final curve (Cb=100µF,
Cin=100nF, Rin=Rfeed=22kΩ) 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.
25/29
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