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TPA2031D1 Arkusz danych(PDF) 11 Page - Texas Instruments |
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TPA2031D1 Arkusz danych(HTML) 11 Page - Texas Instruments |
11 / 24 page Decoupling Capacitor (CS) Input Capacitors (CI) C I I 1 f = (2 R C ) p ´ ´ (2) I I C 1 C = (2 R f ) p ´ ´ (3) _ + IN- IN+ PWM H- Bridge VO+ VO- Internal Oscillator CS ToBattery VDD GND Bias Circuitry RI RI + - Differential Input Filter-FreeClassD SHUTDOWN TPA2031D1 TPA2031D1 www.ti.com........................................................................................................................................................................................................ SLOS546 – MAY 2008 For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the TPA2031D1 to operate at its best, and keeps a high voltage at the input making the inputs less susceptible to noise. The TPA2031D1 is a high-performance class-D audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1 µF, placed as close as possible to the device V DD lead works best. Placing this decoupling capacitor close to the TPA2031D1 is very important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise signals, a 10 µF or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high PSRR of this device. The TPA2031D1 does not require input coupling capacitors if the design uses a differential source that is biased from 0.5 V to VDD –0.8 V (shown in Figure 28). If the input signal is not biased within the recommended common-mode input range, if needing to use the input as a high pass filter (shown in Figure 29), or if using a single-ended source (shown in Figure 30), input coupling capacitors are required. The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in Equation 2. The value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. Equation 3 is reconfigured to solve for the input coupling capacitance. If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. For a flat low-frequency response, use large input coupling capacitors (1 µF). However, in a GSM phone the ground signal is fluctuating at 217 Hz, but the signal from the codec does not have the same 217 Hz fluctuation. The difference between the two signals is amplified, sent to the speaker, and heard as a 217 Hz hum. Figure 28. Typical TPA2031D1 Application Schematic With Differential Input for a Wireless Phone Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPA2031D1 |
Podobny numer części - TPA2031D1 |
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Podobny opis - TPA2031D1 |
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