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參數(shù)資料
| 型號： | TPA6211A1TDGNRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO AMPLIFIER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大小： | 424K |
| 代理商： | TPA6211A1TDGNRQ1 |
hBTL +
p
2 P
L
R
L
4 V
DD
Therefore,
θ
JA
+
1
Derating Factor
+
1
0.0218
+ 45.9
°C W
T
A Max + TJ Max * θJA PDmax
+ 150 * 45.9 (1.27) + 91.7°C
P
Dmax +
2V2
DD
p 2
R
L
SBOS555
– JUNE 2011
(15)
Table 2. Efficiency and Maximum Ambient Temperature vs Output Power
Output Power
Efficiency
Internal Dissipation
Power From Supply
Max Ambient Temperature
(W)
(%)
(W)
(
°C)
5-V, 3-
Systems
0.5
27.2
1.34
1.84
1
38.4
1.60
2.60
76
2.45
60.2
1.62
4.07
75
3.1
67.7
1.48
4.58
82
5-V, 4-
BTL Systems
0.5
31.4
1.09
1.59
1
44.4
1.25
2.25
2
62.8
1.18
3.18
2.8
74.3
0.97
3.77
5-V, 8-
Systems
0.5
44.4
0.625
1.13
1
62.8
0.592
1.60
1.36
73.3
0.496
1.86
1.7
81.9
0.375
2.08
Table 2 employs Equation 15 to calculate efficiencies
The maximum ambient temperature depends on the
for four different output power levels. Note that the
heat sinking ability of the PCB system. The derating
efficiency of the amplifier is quite low for lower power
factor for the 3 mm
×3 mm DRB package is shown in
levels and rises sharply as power to the load is
the dissipation rating table. Converting this to
θJA:
increased resulting in a nearly flat internal power
dissipation over the normal operating range. Note that
the internal dissipation at full output power is less
(17)
than in the half power range. Calculating the
Given
θJA,
the
maximum
allowable
junction
efficiency for a specific system is the key to proper
temperature, and the maximum internal dissipation,
power supply design. For a 2.8-W audio system with
the maximum ambient temperature can be calculated
4-
loads and a 5-V supply, the maximum draw on
with Equation 18. The maximum recommended
the power supply is almost 3.8 W.
junction
temperature
for
the
TPA6211A1-Q1
is
A final point to remember about Class-AB amplifiers
150
°C.
is how to manipulate the terms in the efficiency
equation to the utmost advantage when possible.
(18)
This indicates that as VDD goes down, efficiency goes
Equation 18 shows that the maximum ambient
up.
temperature is 91.7
°C (package limited to 85°C
A simple formula for calculating the maximum power
ambient) at maximum power dissipation with a 5-V
dissipated, PDmax, may be used for a differential
supply.
output application:
Table 2 shows that for most applications no airflow is
required
to
keep
junction
temperatures
in
the
specified range. The TPA6211A1-Q1 is designed with
(16)
thermal protection that turns the device off when the
junction temperature surpasses 150
°C to prevent
PDmax for a 5-V, 4- system is 1.27 W.
damage to the IC. In addition, using speakers with an
impedance higher than 4-
dramatically increases
the thermal performance by reducing the output
current.
Copyright
2011, Texas Instruments Incorporated
19
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