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TPA2025D1YZGT 数据表(PDF) 11 Page - Texas Instruments |
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TPA2025D1YZGT 数据表(HTML) 11 Page - Texas Instruments |
11 / 29 page IN- IN+ PVDD AGND Oscillator Adaptive Boost Converter VBAT Monitor + – PWM H- Bridge BGND Bias Control EN AGC PGND OUT- OUT+ PVDD SW VBAT AGC TPA2025D1 www.ti.com SLOS717B – AUGUST 2011 – REVISED DECEMBER 2014 9 Parameter Measurement Information All parameters are measured according to the conditions described in the Specifications section. Many audio analyzers will not give the correct readings on a Class-D amplifier without additional filtering, even if they have an internal low-pass filter. A RC 30kHz low-pass filter (100- Ω, 47n-F) is implemented to reduce the remaining noise frequencies from the PWM carrier signal. This filter was used on each output for the data sheet graphs. 10 Detailed Description 10.1 Overview The TPA2025D1 is a constant output, high efficiency Class-D audio amplifier with battery tracking AGC technology and an integrated Class-G boost converter. This features give the device a great performance and enhances efficiency at low output power. The TPA2025D1 can drive up to 1.9 W into an 8- Ω speaker (1% THD+N). The built-in boost converter operates from a battery supply voltage and generates a higher output voltage PVDD at 5.75 V that drives the supply voltage of the Class-D amplifier. This provides a louder audio output than a stand-alone amplifier directly connected to the battery. The battery tracking AGC adjusts the Class-D gain to limit battery current at lower battery voltage. This lets the device to extend the battery life while playing audio, typically with 85% efficiency. When the battery voltage is below a certain threshold voltage, The TPA2025D1 lowers the audio loudness. The threshold is selectable with an external pin. The TPA2025D1 has an integrated low-pass filter to improve the RF rejection and reduce DAC out-of-band noise, increasing the signal-to-noise ratio (SNR). The features included in this device allow it to be used in a wide range of portable applications. 10.2 Functional Block Diagram Copyright © 2011–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPA2025D1 |
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类似说明 - TPA2025D1YZGT |
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