TPA2016D2 datasheet(36/51 Pages) TI2

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DMAX

Max =

Max -

= 150 - 100 (0.4) = 110

100°C/W

TPA2016D2

SLOS524E – JUNE 2008 – REVISED MAY 2016

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12.3 Efficiency and Thermal Considerations

The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor

for the packages are shown in the dissipation rating table. Converting this to

θJA for the DSBGA package:

(7)

Given

θJA of 100°C/W, the maximum allowable junction temperature of 150°C, and the maximum internal

dissipation of 0.4 W (0.2 W per channel) for 1.5 W per channel, 8-

Ω load, 5-V supply, from Figure 15, the

maximum ambient temperature can be calculated with Equation 8.

(8)

Equation 8 shows that the calculated maximum ambient temperature is 110°C at maximum power dissipation

with a 5-V supply and 8-

Ω a load. The TPA2016D2 is designed with thermal protection that turns the device off

when the junction temperature surpasses 150°C to prevent damage to the IC. Also, using speakers more

resistive than 8-

Ω dramatically increases the thermal performance by reducing the output current and increasing

the efficiency of the amplifier.

TPA2016D2 Datasheet(PDF) 36 Page - Texas Instruments