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參數資料
| 型號： | TPA2015D1YZHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA16 |
| 封裝： | 1.954 X 1.954 MM, 0.50 MM PITCH, DSBGA-16 |
| 文件頁數： | 9/27頁 |
| 文件大小： | 1016K |
| 代理商： | TPA2015D1YZHT |
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t Time s
V
Voltage
V
0.0
0.5
1.0
1.5
2.0
6
4
2
0
2
4
6
8
10
12
PVOUT
VOUT+ VOUT
VBAT = 3.6 V
Gain = 20 dB
AGC = Float
RL = 8 + 33 H
www.ti.com
SLOS638 – MAY 2010
FILTERED OUTPUT WAVEFORMS
Figure 25.
ADAPTIVE BOOST CONVERTER
The TPA2015D1 consists of an adaptive boost converter and a Class-D amplifier. The boost converter takes the
supply voltage, VBAT, and increases it to a higher output voltage, PVOUT. PVOUT drives the supply voltage of
the Class-D amplifier, PVDD. This improves loudness over non-boosted solutions.
The boost converter is adaptive and activates automatically depending on the output audio signal amplitude.
When the peak output audio signal exceeds a preset voltage threshold, the boost converter is enabled, and the
voltage at PVOUT is 5.5 V. When the audio output voltage is lower than the threshold voltage, the boost
deactivates automatically. The boost activation threshold voltage is not user programmable. It is optimized to
prevent clipping while maximizing system efficiency.
The boost converter can be forcibly deactivated by setting the ENB pin to logic-low. When the boost is
deactivated, PVOUT is equal to the supply voltage (VBAT) minus the I x R drop across the inductor and boost
converter pass transistor.
A timer prevents the input signal from modulating the PVOUT voltage within the audio frequency range,
eliminating the potential for audible artifacts on the Class-D output.
Figure 26 shows how the adaptive boost modulates with a typical audio signal. By automatically deactivating the
boost converter and passing VBAT to PVOUT, the TPA2015D1 efficiency is improved at low output power.
Figure 26. ADAPTIVE BOOST CONVERTER with TYPICAL MUSIC PLAYBACK
The primary external components for the boost converter are the inductor and the boost capacitor. The inductor
stores current, and the boost capacitor stores charge. As the Class-D amplifier depletes the charge in the boost
capacitor, the boost inductor replenishes charge with its stored current. The cycle of charge and discharge
occurs frequently enough to keep PVOUT within its minimum and maximum voltage specification.
Copyright 2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPA2015D1
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