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參數(shù)資料
| 型號： | TPA3000D1 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 17-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 17單聲道無濾波器D類音頻功率放大器 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 273K |
| 代理商： | TPA3000D1 |
TPA3000D1
SLOS379A
–
SEPTEMBER 2001
–
REVISED JANUARY 2002
11
www.ti.com
APPLICATION INFORMATION
eliminating the output filter with the TPA3000D1
This section focuses on how the user can eliminate the output filter with the TPA3000D1.
effect on audio
The class-D amplifier outputs a pulse-width modulated (PWM) square wave, which is the sum of the switching
waveform and the amplified input audio signal. The human ear acts as a band-pass filter such that only the
frequencies between approximately 20 Hz and 20 kHz are passed. The switching frequency components are
much greater than 20 kHz, so the only signal heard is the amplified input audio signal.
traditional class-D modulation scheme
The traditional class-D modulation scheme, which is used in the TPA032D0x family, has a differential output
where each output is 180 degrees out of phase and changes from ground to the supply voltage, V
CC
. Therefore,
the differential prefiltered output varies between positive and negative V
CC
, where filtered 50% duty cycle yields
0 V across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown
in Figure 23. Note that even at an average of 0 V across the load (50% duty cycle), the current to the load is
high, causing high loss, thus causing a high supply current.
0 V
–
12 V
+12 V
Current
OUTP
Differential Voltage
Across Load
OUTN
Figure 23. Traditional Class-D Modulation Scheme
’
s Output Voltage and
Current Waveforms Into an Inductive Load With No Input
TPA3000D1 modulation scheme
The TPA3000D1 uses a modulation scheme that still has each output switching from 0 to the supply voltage.
However, OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater
than 50% and OUTN is less than 50% for positive output voltages. The duty cycle of OUTP is less than 50%
and OUTN is greater than 50% for negative output voltages. The voltage across the load sits at 0 V throughout
most of the switching period, greatly reducing the switching current, which reduces any I
2
R losses in the load.
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| TPA3000D1PWPR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AUDIO AMPLIFIER|SINGLE|CMOS|TSSOP|20PIN|PLASTIC |
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