參數(shù)資料
型號: TPA301DGNRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝: GREEN, PLASTIC, MSOP-8
文件頁數(shù): 11/28頁
文件大小: 765K
代理商: TPA301DGNRG4
www.ti.com
TPA301
SLOS208E – JANUARY 1998 – REVISED JUNE 2004
Converting dB back into watts:
PW = 10
PdB/10
= 11 mW (15 dB headroom)
= 22 mW (12 dB headroom)
= 44 mW (9 dB headroom)
= 88 mW (6 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 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-
system, the internal dissipation in the TPA301 and
maximum ambient temperatures is shown in Table 2.
Table 2. TPA301 Power Rating, 5-V, 8-
, BTL
MAXIMUM AMBIENT
PEAK OUTPUT
AVERAGE OUTPUT
POWER DISSIPATION
TEMPERATURE
POWER
(mW)
0 CFM
350
350 mW
600
46
°C
350
175 mW (3 dB)
500
64
°C
350
88 mW (6 dB)
380
85
°C
350
44 mW (9 dB)
300
98
°C
350
22 mW (12 dB)
200
115
°C
350
11 mW (15 dB)
180
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.
19
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