具有立体声耳机驱动和 I2C 控制的立体声 AB 类音频放大器
The is a stereo audio power amplifier in a 24-pin TSSOP thermally enhanced package capable of delivering 2 W of continuous RMS power per channel into 4- loads. This device utilizes the I2C bus to control its functionality, which minimizes the number of external components needed, simplifies the design, and frees up board space for other features. When driving 1 W into 8- speakers, the TPA0172 has less than 0.2% THD+N from 20 Hz to 20 kHz.
Included within this device is integrated depop circuitry that virtually eliminates transients that cause noise in the speakers at power up, power down, and while transitioning in and out of shutdown mode.
The overall gain of the amplifier is controlled digitally by the volume control registers which are programmed via the I2C interface. At power up, the amplifier defaults to -60 dB in BTL mode, or -66 dB in SE mode. There are four registers that contain the gains: left BTL, right BTL, left SE, and right SE. Each register contains six bits, which allows 64 gain steps from -60 dB to 20 dB in 1.25-dB steps, and two bits that mute the amplifier.
The TPA0172 only consumes 6.5 mA of supply current during normal operation. A shutdown mode is included that reduces supply current to less than 15 uA.
The PowerPAD package PWP delivers a level of thermal performance that was previously achievable on TO-200-type packages. Thermal impedances of approximately 35°C/W are truly realized in multilayer PCB applications. This allows the TPA0172 to operate at full power into 8- loads at ambient temperatures of 85°C.
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- I2C Bus Controllable
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- 2-W/Ch Output Power Into 4- Load
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- Low Supply Current and Shutdown Current
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- Depop Circuitry
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- Digital Volume Control From 20 dB to -60 dB
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- Internal Gain Control, Which Eliminates External Gain-Setting Resistors
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- Fully Differential Input
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- Stereo Input MUX
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- PC-Beep Input
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- Compatible With PC 99 Desktop Line-Out Into 10-k Load
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- Compatible With PC 99 Portable Into 8- Load
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- Surface-Mount Power Packaging 24-Pin TSSOP PowerPAD
PowerPAD is a trademark of Texas Instruments.