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TS4984FC Datasheet(PDF) 24 Page - STMicroelectronics

Part # TS4984FC
Description  1.2W Stereo Audio Power Amplifier with Active Low Standby Mode
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4984FC Datasheet(HTML) 24 Page - STMicroelectronics

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Application Information
TS4984FC
24/30
4.9
Application example: differential-input BTL power stereo
amplifier
The schematic in
Figure 67 shows how to design the TS4984 to work in differential-input mode.
For this discussion, only the left-channel amplifier will be referred to.
Let:
R1R =R2L =R1, R2R =R2L =R2
CinR = CinL =Cin
The gain of the amplifier is:
In order to reach the optimal performance of the differential function,
R1 and R2 should be
matched at 1% maximum.
The value of the input capacitor Cin can be calculated with the following formula, using the -3dB
lower frequency required (where FL is the lower frequency required):
Figure 67. Differential input amplifier configuration
G
Vdif= 2
R2
R1
--------
R1L
CinL
R2L
VCC
Cs
Cb
Neg. Input LEFT
8 Ohms
LEFT Speaker
8 Ohms
RIGHT Speaker
R1R
CinR
R2R
Neg. Input RIGHT
StandBy
Control
R1L
CinL
Pos. Input LEFT
R1R
CinR
Pos. Input RIGHT
R2L
R2R
Bias
StandBy
BypassL
VO-L
VO+L
VO-R
VO+R
IN-L
IN+L
IN+R
IN-R
+
-
+
-
+
-
AV = -1
+
-
AV = -1
BypassR
TS4984
C
in
1
2
πR
1FL
---------------------
(F)
≈



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