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參數(shù)資料
| 型號： | TPA6021A4NE4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDIP20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS001-AD, DIP-20 |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 1823K |
| 代理商： | TPA6021A4NE4 |
www.ti.com
P
D(max) +
2V2
DD
p 2
R
L
(11)
q
JA =
=
= 45 C/W
o
1
Derating Factor
0.0222
(12)
T
A Max = T
P
J
JA
D
Max - q
= 150 - 45 (0.6 x 2) = 96 C(15-dB crest factor)
o
(13)
TPA6021A4
SLOS465 – JUNE 2005
Table 4. TPA6021A4 Power Rating, 5-V, 4-
Stereo
PEAK OUTPUT POWER
POWER DISSIPATION
MAXIMUM AMBIENT
AVERAGE OUTPUT POWER
(W)
(W/Channel)
TEMPERATURE
3
1500 mW (3 dB)
1.26
37
°C
3
750 mW (6 dB)
1.20
42
°C
3
380 mW (9 dB)
1.00
59
°C
3
190 mW (12 dB)
0.79
79
°C
3
95 mW (15 dB)
0.60
96
°C(1)
3
48 mW (18 dB)
0.44
110
°C(1)
(1)
Package limited to 85
°C ambient.
Table 5. TPA6021A4 Power Rating, 5-V, 8-
Stereo
PEAK OUTPUT POWER
POWER DISSIPATION
MAXIMUM AMBIENT
AVERAGE OUTPUT POWER
(W)
(W/Channel)
TEMPERATURE
2.2
1100 mW (3-dB crest factor)
0.57
99
°C(1)
2.2
876 mW (4-dB crest factor)
0.61
95
°C(1)
2.2
440 mW (7-dB crest factor)
0.62
95
°C(1)
2.2
220 mW (10-dB crest factor)
0.53
103
°C(1)
(1)
Package limited to 85
°C ambient.
The maximum dissipated power (PD(max)) is reached at a much lower output power level for an 8- load than for
a 4-
load. As a result, this simple formula for calculating P
D(max) may be used for an 8- application.
However, in the case of a 4-
load, the P
D(max) 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 PD(max) formula for
a 4-
load.
The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor
for the N package with an external heatsink is shown in the dissipation rating table. Use Equation 12 to convert
this to
θ
JA. .
To calculate maximum ambient temperatures, first consider that the numbers from the dissipation graphs are per
channel, so the dissipated power needs to be 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 TPA6021A4 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.
Table 4 and Table 5 show that some applications require no airflow to keep junction temperatures in the
specified range. The TPA6021A4 is designed with thermal protection that turns the device off when the junction
temperature surpasses 150
listening volume without distortion. When the output level is reduced the numbers in the table change
significantly. Also, using 8-
speakers increases the thermal performance by increasing amplifier efficiency.
22
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