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| 型號： | TPA005D14DCA |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 音頻放大器 |
| 英文描述： | 2-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 2 - W立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 21/29頁 |
| 文件大小： | 420K |
| 代理商： | TPA005D14DCA |
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TPA005D14
2-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS240A – AUGUST 1999 – REVISED MARCH 2000
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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 r
DS(on)
, and rise and fall times that are greater than zero.
The loss due to a nonzero r
DS(on)
is called conduction loss, and is the power lost in the output transistors at
nonswitching times, when the transistor is ON (saturated). Any R
DS(on)
above 0
causes conduction loss.
Figure 25 shows an H-bridge output circuit simplified for conduction loss analysis and can be used to determine
new efficiencies with conduction losses included.
VDD = 5 V
RL
4
0.35
0.35
RDS(on)
RDS(off)
RDS(off)
RDS(on)
5 M
5 M
Figure 25. Output Transistor Simplification for Conduction Loss Calculation
The power supplied, P
SUP
, 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
I
2
R
L
I
2
2r
DS(on)
I
2
R
L
Efficiency
P
L
P
SUP
Efficiency
R
L
2r
DS(on)
R
L
Efficiency
95%
at all output levels r
DS(on)
0.1, R
L
4
Efficiency
85%
at all output levels r
DS(on)
0.35, R
L
4
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