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TS4962M 数据表(PDF) 28 Page - STMicroelectronics

部件名 TS4962M
功能描述  3W filter-free class D audio power amplifier
PDF  41 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS4962M 数据表(HTML) 28 Page - STMicroelectronics

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Application information
TS4962M
28/41
5
Application information
5.1
Differential configuration principle
The TS4962M is a monolithic fully-differential input/output class D power amplifier. The
TS4962M also includes a common-mode feedback loop that controls the output bias value
to average it at VCC/2 for any DC common mode input voltage. This allows the device to
always have a maximum output voltage swing, and by consequence, maximizes the output
power. Moreover, as the load is connected differentially compared to a single-ended
topology, the output is four times higher for the same power supply voltage.
The advantages of a full-differential amplifier are:
●
High PSRR (power supply rejection ratio).
●
High common mode noise rejection.
●
Virtually zero pop without additional circuitry, giving a faster start-up time compared to
conventional single-ended input amplifiers.
●
Easier interfacing with differential output audio DAC.
●
No input coupling capacitors required due to common mode feedback loop.
The main disadvantage is:
●
As the differential function is directly linked to external resistor mismatching, paying
particular attention to this mismatching is mandatory in order to obtain the best
performance from the amplifier.
5.2
Gain in typical application schematic
Typical differential applications are shown in Figure 1 on page 4.
In the flat region of the frequency-response curve (no input coupling capacitor effect), the
differential gain is expressed by the relation:
with Rin expressed in kΩ.
Due to the tolerance of the internal 150k
Ω feedback resistor, the differential gain will be in
the range (no tolerance on Rin):
A
V
diff
Out
+
Out
-
–
In
+
In
-
–
-------------------------------
300
R
in
----------
==
273
R
in
----------
A
V
diff
327
R
in
----------
≤≤



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