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TPA721 Datasheet(PDF) 18 Page - Texas Instruments

Part No. TPA721
Description  700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPA721 Datasheet(HTML) 18 Page - Texas Instruments

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TPA721
SLOS231E – NOVEMBER 1998 – REVISED JUNE 2004
Converting dB back into watts:
PW = 10
PdB/10
= 22 mW (15-dB headroom)
= 44 mW (12-dB headroom)
= 88 mW (9-dB headroom)
= 175 mW (6-dB headroom)
= 350 mW (3-dB headroom)
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 700 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 TPA721 and
maximum ambient temperatures is shown in Table 2.
Table 2. TPA721 Power Rating, 5-V, 8-
Ω BTL
D PACKAGE
DGN PACKAGE
(SOIC)
(MSOP)
PEAK OUTPUT
AVERAGE
POWER
POWER
OUTPUT
DISSIPATION
MAXIMUM AMBIENT
MAXIMUM AMBIENT
(mW)
POWER
(mW)
TEMPERATURE
TEMPERATURE
(0
° CFM)
(0
° CFM)
700
700 mW
675
34
°C
110
°C
700
350 mW (3 dB)
595
47
°C
115
°C
700
176 mW (6 dB)
475
68
°C
122
°C
700
88 mW (9 dB)
350
89
°C
125
°C
700
44 mW (12 dB)
225
111
°C
125
°C
Table 2 shows that the TPA721 can be used to its full 700-mW rating without any heat sinking in still air up to
110
°C and 34°C for the DGN package (MSOP) and D package (SOIC), respectively.
18


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