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參數資料
| 型號： | TS4872IJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封裝： | FCP-8 |
| 文件頁數： | 14/29頁 |
| 文件大小： | 1012K |
| 代理商： | TS4872IJT |
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Obsolete
Product(s)
- Obsolete
Product(s)
TS4872
21/29
NO
T
F
O
R
NEW
D
E
SIGN
Fig. 83 : Flip Chip Demoboard Bottom Layer
■ BTL Configuration Principle
The TS4872 is a monolithic power amplifier with a
BTL output type. BTL (Bridge Tied Load) means
that each end of the load is 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.
■ 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.
■ 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
■ Power dissipation and efficiency
Hypothesis :
Voltage and current in the load are sinusoidal
(Vout and Iout)
Supply voltage is a pure DC source (Vcc)
Regarding the load we have :
and
)
W
(
R
)
Vout
2
(
Pout
L
2
RMS
=
Vout1 =
Vin
–
R fe ed
Ri n
-------------------- (V)
Vout2
Vo ut1 = 2Vin
–
Rfee d
Rin
-------------------- (V)
Gv =
Vout2
Vou t1
–
Vi n
--------------------------------------- = 2
Rfee d
Ri n
--------------------
F CL =
1
2
π Rin Cin
--------------------------------
Hz
()
FCH =
1
2
π Rfeed Cfeed
-----------------------------------------------
Hz
()
VOUT = VPEAK sinωt (V)
IOUT =
VOUT
R L
----------------- (A)
POUT =
VPEAK
2
2RL
---------------------- (W)
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