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| TPA6120A2_08 Datasheet, PDF (18/26 Pages) Texas Instruments – HIGH FIDELITY HEADPHONE AMPLIFIER | |||
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TPA6120A2
SLOS431 â MARCH 2004
APPLICATION INFORMATION (continued)
VP + Ǹ2 PL RL
Therefore,
PSUP
+
VCCVP
p RL
) VCC ICC(q)
PL = Power delivered to load (per channel)
PSUP = Power drawn from power supply
VLRMS = RMS voltage on the load
RL = Load resistance
VP = Peak voltage on the load
ICCavg = Average current drawn from the power supply
ICC(q) = Quiescent current (per channel)
VCC = Power supply voltage (total supply voltage = 30 V if running on a ±15-V power supply
η = Efficiency of a SE amplifier
www.ti.com
(5)
(6)
For stereo operation, the efficiency does not change because both PL and PSUP are doubled. This effects the
amount of power dissipated by the package in the form of heat.
A simple formula for calculating the power dissipated, PDISS, is shown in Equation 7:
PDISS + (1 * h) PSUP
(7)
In stereo operation, PSUP is twice the quantity that is present in mono operation.
The maximum ambient temperature, TA, depends on the heat-sinking ability of the system. θJA for a 20-pin DWP,
whose thermal pad is properly soldered down, is shown in the dissipation rating table.
TA Max + TJ Max * ÎJA PDiss
(8)
2
Mono Operation
1.8
VCC = +15 V, RL = 32 W
1.6
1.4
VCC = +12 V, RL = 32 W
1.2
1
VCC = +15 V,
RL = 64 W
0.8
0.6
0.4
VCC = +12 V,
RL = 64 W
0.2
0
0 0.5 1 1.5 2 2.5 3 3.5
PO â Output Power â W
Figure 35. Power Dissipation vs Output Power
18
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