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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： | 8/27頁 |
| 文件大小： | 1016K |
| 代理商： | TPA2015D1YZHT |
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SLOS638 – MAY 2010
www.ti.com
FULLY DIFFERENTIAL CLASS-D AMPLIFIER
The TPA2015D1 uses a fully differential amplifier with differential inputs and outputs. The differential output
voltage equals the differential input multiplied by the amplifier gain. The TPA2015D1 can also be used with a
single-ended input. However, using differential input signals when in a noisy environment, like a wireless
handset, ensures maximum system noise rejection.
Advantages of Fully Differential Amplifiers
Mid-supply bypass capacitor, CBYPASS, not required:
–
The fully differential amplifier does not require a mid-supply bypass capacitor. Any shift in the mid-supply
affects both positive and negative channels equally and cancels at the differential output.
Improved RF-immunity:
–
GSM handsets save power by turning on and shutting off the RF transmitter at a rate of 217 Hz. This
217 Hz burst often couples to audio amplifier input and output traces causing frame-rate noise. Fully
differential amplifiers cancel frame-rate noise better than non-differential amplifiers.
Input-coupling capacitors not required, but recommended:
–
The fully differential amplifier allows the inputs to be biased at voltages other than mid-supply (PVDD/2).
The TPA2015D1 inputs can be biased anywhere within the common mode input voltage range, as listed in
the OPERATING CHARACTERISTICS table. If the inputs are biased outside of that range, then
input-coupling capacitors are required.
–
Note that without input coupling capacitors, any dc offset from the audio source will be modulated by the
AGC. This could cause artifacts in the audio output signal. Perform listening tests to determine if direct
input coupling is acceptable.
The TPA2015D1 has 3 selectable fixed-gains: 6 dB, 15.5 dB, and 20 dB. Connect the GAIN pin as shown in
Table 2. Amplifier Fixed-Gain
Connect GAIN Pin to
Amplifier Gain
GND
6 dB
No Connection (Floating)
15.5 dB
VBAT
20 dB
Improved Class-D Efficiency
The TPA2015D1 output stage uses a modulation technique that modulates the PWM output only on one side of
the differential output, leaving the other side held at ground. Although the differential output voltage is
undistorted, each output appears as a half-wave rectified signal.
This technique reduces output switching losses and improves overall amplifier efficiency. Figure 25 shows how
OUT+, OUT-, and the differential output voltages appear on an oscilloscope.
16
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPA2015D1
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