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參數(shù)資料
| 型號： | TPA0252PWPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 17/34頁 |
| 文件大小： | 851K |
| 代理商： | TPA0252PWPR |
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P
Dmax +
2V2
DD
p 2
R
L
(11)
θ
JA +
1
Derating Factor
+
1
0.022
+ 45
°C W
(12)
T
A Max + TJ Max * θJA PD
+ 150 * 45(0.6
2) + 96°C (15-dB crest factor)
(13)
TPA0252
SLOS288B – JUNE 2000 – REVISED SEPTEMBER 2004
Table 3. TPA0252 Power Rating, 5-V, 3-
, Stereo
PEAK OUTPUT POWER
POWER DISSIPATION
MAXIMUM AMBIENT
AVERAGE OUTPUT POWER
(W)
(W/Channel)
TEMPERATURE(1)
4
2 W (3 dB)
1.7
-3
°C
4
1000 mW (6 dB)
1.6
6
°C
4
500 mW (9 dB)
1.3
24
°C
4
250 mW (12 dB)
1.0
51
°C
4
125 mW (15 dB)
0.9
78
°C
4
63 mW (18 dB)
0.6
85
°C(1)
(1)
Package limited to 85
°C ambient
Table 4. TPA0252 Power Rating, 5-V, 8-
, Stereo
PEAK OUTPUT POWER
POWER DISSIPATION
MAXIMUM AMBIENT
AVERAGE OUTPUT POWER
(W)
(W/Channel)
TEMPERATURE
2.5
1250 mW (3-dB crest factor)
0.53
85
°C(1)
2.5
1000 mW (4-dB crest factor)
0.59
85
°C(1)
2.5
500 mW (7-dB crest factor)
0.62
85
°C(1)
2.5
250 mW (10-dB crest factor)
0.55
85
°C(1)
(1)
Package limited to 85
°C ambient
The maximum dissipated power (PDmax) is reached at a much lower output power level for a 3- load than for an
8-
load. As a result, the formula in Equation 11for calculating P
Dmax may be used for a 3- application:
However, in the case of an 8-
load, the P
Dmax occurs at a point well above the normal operating power level.
The amplifier may therefore be operated at a higher ambient temperature than required by the PDmax formula for
an 8-
load, but do not exceed the maximum ambient temperature of 85°.
The maximum ambient temperature depends on the heatsinking ability of the PCB system. The derating factor
for the PWP package is shown in the dissipation rating table. Converting this to
θ
JA:
To calculate maximum ambient temperatures, first consider that the numbers from the dissipation graphs are
per-channel, so the dissipated heat is doubled for two-channel operation. Given
θ
JA, the maximum allowable
junction temperature, and the total internal dissipation, the maximum ambient temperature can be calculated
using Equation 13. The maximum recommended junction temperature for the device is 150
°C. The internal
dissipation figures are taken from the Power Dissipation vs Output Power graphs.
NOTE:
Internal dissipation of 0.6 W is estimated for a 2-W system with 15-dB crest factor per
channel.
Due to package limitiations, the actual TAMAX is 85°C.
The power rating tables show that for some applications, no airflow is required to keep junction temperatures in
the specified range. The internal thermal protection turns the device off at junction temperatures higher than
150
°C to prevent damage to the IC. The power rating tables in this section were calculated for maximum
listening volume without distortion. When the output level is reduced the numbers in the table change
significantly. Also, using 8-
speakers dramatically increases the thermal performance by increasing amplifier
efficiency.
24
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| TPA0253DGQ | 制造商:Texas Instruments 功能描述:IC SM POWER AMP CLASS-AB AUDIO |
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