TPA301
350-mW MONO AUDIO POWER AMPLIFIER
SLOS208C – JANUARY1998 – REVISED MARCH 2000
APPLICATION INFORMATION
headroom and thermal considerations (continued)
This is valuable information to consider when attempting to estimate the heat dissipation requirements for the
amplifier system. Comparing the absolute worst case, which is 350 mW of continuous power output with 0 dB
of headroom, against 12 dB and 15 dB applications drastically affects maximum ambient temperature ratings
for the system. Using the power dissipation curves for a 5-V, 8-Ω system, the internal dissipation in the TPA301
and maximum ambient temperatures is shown in Table 2.
Table 2. TPA301 Power Rating, 5-V, 8-Ω, BTL
MAXIMUM AMBIENT
PEAK OUTPUT POWER
(mW)
POWER DISSIPATION
(mW)
TEMPERATURE
0 CFM
46°C
AVERAGE OUTPUT POWER
350
350
350
350
350
350
350 mW
600
500
380
300
200
180
175 mW (3 dB)
88 mW (6 dB)
44 mW (9 dB)
22 mW (12 dB)
11 mW (15 dB)
64°C
85°C
98°C
115°C
119°C
Table 2 shows that the TPA301 can be used to its full 350-mW rating without any heat sinking in still air up to
46°C.
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