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TPA6030A4 데이터시트(PDF) 23 Page - Texas Instruments

부품명 TPA6030A4
상세설명  3-2 STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
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TPA6030A4
SLOS395B − DECEMBER 2002 − REVISED JANUARY 2005
www.ti.com
23
Equation 12 represents the power drawn from the supply during mono operation. For stereo operation, the first term of
equation 12 is doubled while the second term in the equation, quiescent power, does not change.
Equation 13 represents the power drawn from the supply during stereo operation.
PSUP(stereo) +
4VCCVP
pRL
) VCC ICC(q)
Substituting PL and PSUP into equation 10:
hBTL(stereo) +
2PL
4VCCVP
pRL
) VCC ICC(q)
Note the factor of 2 in the numerator for stereo operation.
Recall that:
hBTL(stereo) +
2p PL RL
4VCC 2PL ) VCC ICC(q) p RL
+
2p PL RL
4VCCVP ) VCC ICC(q) pRL
VP + 2PL RL
therefore,
For SE operation, the current waveform is halfwave rectified. Therefore, ICCavg must be recalculated.
In an SE system:
ICCavg +
1
p
p
2
0
VP
RL
sin(t) dt +*
VP
pRL
[cos(t)]
p
2
0
+
VP
p RL
therefore,
PSUP +
VCCVP
p RL
) VCC ICC(q)
Stereo operation has the same effect in SE as it does in BTL when doubling the first term of the equation dealing with power
drawn from the supply (equation 16).
PSUP(stereo) +
2VCCVP
p RL
) VCC ICC(q)
Following the same steps for SE operation as in BTL operation:
hSE(stereo) +
2PL
2VCCVP
p RL
) VCC ICC(q)
+
2p PL RL
2VCCVP ) VCC ICC(q) pRL
Recall that:
hSE(stereo) +
2p PL RL
2VCC 2PL ) VCC ICC(q) p RL
VP + 2PL RL
therefore,
(13)
(14)
(15)
(16)
(17)
(18)


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