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TPA032D04DCA Folha de dados(PDF) 11 Page - Texas Instruments |
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TPA032D04DCA Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 26 page TPA032D04 10W STEREO CLASSD AUDIO POWER AMPLIFIER SLOS203B − DECEMBER 1999 − REVISED JUNE 2000 12 TI.COM POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 APPLICATION INFORMATION input capacitor, CI In the typical application an input capacitor, CI, is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation. In this case, CI and ZI, the TPA032D04’s input resistance forms a high-pass filter with the corner frequency determined in equation 8. (8) f c(highpass) + 1 2 pZ I C I −3 dB fc ZI is nominally 10 kΩ The value of CI is important to consider as it directly affects the bass (low frequency) performance of the circuit. Consider the example where the specification calls for a flat bass response down to 40 Hz. Equation 8 is reconfigured as equation 9. (9) C I + 1 2 pZ I fc In this example, CI is 0.40 µF so one would likely choose a value in the range of 0.47 µF to 1 µF. A low-leakage tantalum or ceramic capacitor is the best choice for the input capacitors. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input, as the dc level there is held at 1.5 V, which is likely higher than the source dc level. Please note that it is important to confirm the capacitor polarity in the application. differential input The TPA032D04 has differential inputs to minimize distortion at the input to the IC. Since these inputs nominally sit at 1.5 V, dc-blocking capacitors are required on each of the four input terminals. If the signal source is single-ended, optimal performance is achieved by treating the signal ground as a signal. In other words, reference the signal ground at the signal source, and run a trace to the dc-blocking capacitor, which should be located physically close to the TPA032D04. If this is not feasible, it is still necessary to locally ground the unused input terminal through a dc-blocking capacitor. power supply decoupling, CS The TPA032D04 is a high-performance Class-D CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series- resistance (ESR) ceramic capacitor, typically 0.1 µF placed as close as possible to the device’s various VDD leads, works best. For filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10 µF or greater placed near the audio power amplifier is recommended. The TPA032D04 has several different power supply terminals. This was done to isolate the noise resulting from high-current switching from the sensitive analog circuitry inside the IC. |
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