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參數(shù)資料
| 型號： | TPA032D04DCARG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48 |
| 封裝： | PLASTIC, HTSSOP-48 |
| 文件頁數(shù)： | 8/26頁 |
| 文件大小： | 439K |
| 代理商： | TPA032D04DCARG4 |
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TPA032D04
10W STEREO CLASSD AUDIO POWER AMPLIFIER
SLOS203B DECEMBER 1999 REVISED JUNE 2000
17
TI.COM
APPLICATION INFORMATION
losses in a real-world class-D amplifier
Losses make class-D amplifiers nonideal, and reduce the efficiency below 100%. These losses are due to the
output transistors having a nonzero rDS(on), and rise and fall times that are greater than zero.
The loss due to a nonzero rDS(on) is called conduction loss, and is the power lost in the output transistors at
nonswitching times, when the transistor is on (saturated). Any rDS(on) above 0 causes conduction loss.
Figure 9 shows an H-bridge output circuit simplified for conduction loss analysis and can be used to determine
new efficiencies with conduction losses included.
VDD = 12 V
RL
4
0.36
0.36
rDS(on)
rDS(off)
rDS(on)
5 M
5 M
Figure 9. Output Transistor Simplification for Conduction Loss Calculation
The power supplied, PSUP, is determined to be the power output to the load plus the power lost in the transistors,
assuming that there are always two transistors on.
Efficiency
+ h +
I2R
L
I2 2r
DS(on) )
I2R
L
Efficiency
+ h +
P
L
P
SUP
Efficiency
+ h +
R
L
2r
DS(on) )
R
L
Efficiency
+ h + 95% at all output levels r
DS(on) +
0.1
,R
L +
4
Efficiency
+ h + 85% at all output levels r
DS(on) +
0.36
,R
L +
4
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