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參數資料
| 型號： | TPA3005D2PHPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封裝： | GREEN, PLASTIC, HTQFP-48 |
| 文件頁數： | 4/30頁 |
| 文件大小： | 643K |
| 代理商： | TPA3005D2PHPRG4 |
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0 V
12 V
+12 V
Current
OUTP
Differential Voltage
Across Load
OUTN
SLOS427A – MAY 2004 – REVISED AUGUST 2010
www.ti.com
CLASS-D OPERATION
This section focuses on the class-D operation of the TPA3005D2.
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, VCC. Therefore,
the differential prefiltered output varies between positive and negative VCC, 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 16. 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 and thus causing a high supply current.
Figure 16. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an
Inductive Load With No Input
TPA3005D2 Modulation Scheme
The TPA3005D2 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 I2R losses in the load.
12
Copyright 2004–2010, Texas Instruments Incorporated
Product Folder Link(s): TPA3005D2
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