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TS4890ID 数据表(PDF) 24 Page - STMicroelectronics

部件名 TS4890ID
功能描述  RAIL TO RAIL OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW
PDF  32 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS4890ID 数据表(HTML) 24 Page - STMicroelectronics

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TS4890
24/32
Fig. 105 : SO8 & MiniSO8 Demoboard Top
Solder Layer
Fig. 106 : SO8 & MiniSO8 Demoboard Bottom
Solder Layer
s BTL Configuration Principle
The TS4890 is a monolithic power amplifier with a
BTL output type. BTL (Bridge Tied Load) means
that each end of the load are connected to two
single ended output amplifiers. Thus, we have :
Single ended output 1 = Vout1 = Vout (V)
Single ended output 2 = Vout2 = -Vout (V)
And Vout1 - Vout2 = 2Vout (V)
The output power is :
For the same power supply voltage, the output
power in BTL configuration is four times higher
than
the
output
power
in
single
ended
configuration.
s Gain In Typical Application Schematic
(cf. page 1)
In flat region (no effect of Cin), the output voltage
of the first stage is :
For the second stage : Vout2 = -Vout1 (V)
The differential output voltage is
The differential gain named gain (Gv) for more
convenient usage is :
Remark : Vout2 is in phase with Vin and Vout1 is
180 phased with Vin. It means that the positive
terminal of the loudspeaker should be connected
to Vout2 and the negative to Vout1.
s Low and high frequency response
In low frequency region, the effect of Cin starts.
Cin with Rin forms a high pass filter with a -3dB cut
off frequency .
In high frequency region, you can limit the
bandwidth by adding a capacitor (Cfeed) in
parallel on Rfeed. Its form a low pass filter with a
-3dB cut off frequency .
)
W
(
R
)
Vout
2
(
Pout
L
2
RMS
=
)
V
(
Rin
Rfeed
Vin
1
Vout
−
=
)
V
(
Rin
Rfeed
Vin
2
1
Vout
2
Vout
=
−
Rin
Rfeed
2
Vin
1
Vout
2
Vout
Gv
=
−
=
(Hz)
RinCin
2
1
FCL
π
=
)
Hz
(
Cfeed
Rfeed
2
1
FCH
π
=



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