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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TPA6203A1 데이터시트(PDF) 11 Page - Texas Instruments |
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TPA6203A1 데이터시트(HTML) 11 Page - Texas Instruments |
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11 / 29 page  Input Capacitor (CI) Decoupling Capacitor (CS) fc + 1 2pR I C I (2) USING LOW-ESR CAPACITORS –3 dB fc DIFFERENTIAL OUTPUT VERSUS C I + 1 2pR I fc (3) TPA6203A1 www.ti.com.......................................................................................................................................................... SLOS364F – MARCH 2002 – REVISED JUNE 2008 The TPA6203A1 does not require input coupling The TPA6203A1 is a high-performance CMOS audio capacitors if using a differential input source that is amplifier that requires adequate power supply biased from 0.5 V to VDD - 0.8 V. Use 1% tolerance decoupling to ensure the output total harmonic or better gain-setting resistors if not using input distortion (THD) is as low as possible. Power supply coupling capacitors. decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. For In the single-ended input application an input higher frequency transients, spikes, or digital hash on capacitor, CI, is required to allow the amplifier to bias the line, a good low equivalent-series- resistance the input signal to the proper dc level. In this case, CI (ESR) ceramic capacitor, typically 0.1 µF to 1 µF, and RI form a high-pass filter with the corner placed as close as possible to the device VDD lead frequency determined in Equation 2. works best. For filtering lower frequency noise signals, a 10- µF or greater capacitor placed near the audio power amplifier also helps, but is not required in most applications because of the high PSRR of this device. Low-ESR capacitors are recommended throughout this applications section. A real (as opposed to ideal) capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance the more the real capacitor behaves like an ideal capacitor. The value of CI is important to consider as it directly affects the bass (low frequency) performance of the SINGLE-ENDED OUTPUT circuit. Consider the example where RI is 10 kΩ and Figure 31 shows a Class-AB audio power amplifier the specification calls for a flat bass response down (APA) in a fully differential configuration. The to 100 Hz. Equation 2 is reconfigured as Equation 3. TPA6203A1 amplifier has differential outputs driving both ends of the load. There are several potential benefits to this differential drive configuration, but initially consider power to the load. The differential In this example, CI is 0.16 µF, so one would likely drive to the speaker means that as one side is choose a value in the range of 0.22 µF to 0.47 µF. A slewing up, the other side is slewing down, and vice further consideration for this capacitor is the leakage versa. This in effect doubles the voltage swing on the path from the input source through the input network load as compared to a ground referenced load. (RI, CI) and the feedback resistor (RF) to the load. Plugging 2 × VO(PP) into the power equation, where This leakage current creates a dc offset voltage at the voltage is squared, yields 4× the output power from input to the amplifier that reduces useful headroom, the same supply rail and load impedance (see especially in high gain applications. For this reason, a Equation 4). ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications, as the dc level there is held at VDD/2, which is likely higher than the source dc level. It is important to confirm the capacitor polarity in the application. Copyright © 2002–2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPA6203A1 |
유사한 부품 번호 - TPA6203A1_15 |
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유사한 설명 - TPA6203A1_15 |
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