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TPA6211A1DRB Datasheet(PDF) 18 Page - Texas Instruments

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Part # TPA6211A1DRB
Description  3.1-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TPA6211A1DRB Datasheet(HTML) 18 Page - Texas Instruments

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RL
CC
VO(PP)
VO(PP)
VDD
-3 dB
fc
V(LRMS)
VO
IDD
IDD(avg)
FULLY DIFFERENTIAL AMPLIFIER
TPA6211A1
SLOS367B – AUGUST 2003 – REVISED AUGUST 2004
An easy-to-use equation to calculate efficiency starts
out as being equal to the ratio of power from the
power supply to the power delivered to the load. To
accurately calculate the RMS and average values of
power in the load and in the amplifier, the current and
voltage waveform shapes must first be understood
(see Figure 35).
Figure 34. Single-Ended Output and Frequency
Response
Figure 35. Voltage and Current Waveforms for
Increasing power to the load does carry a penalty of
BTL Amplifiers
increased internal power dissipation. The increased
dissipation is understandable considering that the
Although the voltages and currents for SE and BTL
BTL configuration produces 4
× the output power of
are sinusoidal in the load, currents from the supply
the SE configuration.
are different between SE and BTL configurations. In
an
SE
application
the
current
waveform
is
a
half-wave rectified shape, whereas in BTL it is a
EFFICIENCY AND THERMAL INFORMATION
full-wave rectified waveform. This means RMS con-
version factors are different. Keep in mind that for
Class-AB amplifiers are inefficient, primarily because
most of the waveform both the push and pull transis-
of voltage drop across the output-stage transistors.
tors are not on at the same time, which supports the
The two components of this internal voltage drop are
fact that each amplifier in the BTL device only draws
the headroom or dc voltage drop that varies inversely
current from the supply for half the waveform. The
to output power, and the sinewave nature of the
following equations are the basis for calculating
output. The total voltage drop can be calculated by
amplifier efficiency.
subtracting the RMS value of the output voltage from
VDD. The internal voltage drop multiplied by the
average value of the supply current, IDD(avg), deter-
mines the internal power dissipation of the amplifier.
18


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