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參數資料
| 型號： | TPA005D14DCAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48 |
| 封裝： | PLASTIC, HTSSOP-48 |
| 文件頁數： | 14/30頁 |
| 文件大小： | 492K |
| 代理商： | TPA005D14DCAR |
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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 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 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(on)
5 M
5 M
Figure 25. 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) +
0.35, R
L +
4
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