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TPA0211 Datenblatt(PDF) 11 Page - Texas Instruments |
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TPA0211 Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 26 page TPA0211 2-W MONO AUDIO POWER AMPLIFIER SLOS275D – JANUARY 2000 – REVISED NOVEMBER 2002 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION gain setting via input resistance The gain of the input stage is set by the user-selected input resistor and a 50-k Ω internal feedback resistor. However, the power stage is internally configured with a gain of –1.25 V/V in SE mode, and –2.5 V/V in BTL mode. Thus, the feedback resistor (RF) is effectively 62.5 kΩ in SE mode and 125 kΩ in BTL mode. Therefore, the overall gain can be calculated using equations (1) and (2). (1) A V + –125 k W R I (BTL) (2) A V + –62.5 k W R I (SE) The –3 dB frequency can be calculated using equation 3: (3) ƒ –3dB + 1 2 p R I C i If the filter must be more accurate, the value of the capacitor should be increased while the value of the resistor to ground should be decreased. In addition, the order of the filter could be increased. 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 the input resistance of the amplifier, RI, form a high-pass filter with the corner frequency determined in equation 4. f c(highpass) + 1 2 pR I C i –3 dB fc (4) The value of Ci is important to consider as it directly affects the bass (low frequency) performance of the circuit. Consider the example where RI is 10 kΩ and the specification calls for a flat bass response down to 40 Hz. Equation 2 is reconfigured as equation 5. C i + 1 2 pR I fc (5) In this example, CI is 0.4 µF so one would likely choose a value in the range of 0.47 µF to 1 µF. A further consideration for this capacitor is the leakage path from the input source through the input network (Ci) and the feedback network to the load. This leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason a low-leakage tantalum or 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. Note that it is important to confirm the capacitor polarity in the application. |
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