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TPA0213DGQG4 데이터시트(PDF) 11 Page - Texas Instruments |
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TPA0213DGQG4 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 24 page TPA0213 2-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE SLOS276D – JANUARY 2000 – REVISED NOVEMBER 2002 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION output coupling capacitor, C(C) In the typical single-supply SE configuration, an output coupling capacitor (C(C)) is required to block the dc bias at the output of the amplifier, thus preventing dc currents in the load. As with the input coupling capacitor, the output coupling capacitor and impedance of the load form a high-pass filter governed by equation 6. (6) f c(high) + 1 2 pR L C (C) –3 dB fc The main disadvantage, from a performance standpoint, is that the load impedances are typically small, which drives the low-frequency corner higher, degrading the bass response. Large values of C(C) are required to pass low frequencies into the load. Consider the example where a C(C) of 330 µF is chosen and loads vary from 3 Ω, 4 Ω, 8 Ω, 32 Ω, 10 kΩ, to 47 kΩ. Table 1 summarizes the frequency response characteristics of each configuration. Table 1. Common Load Impedances vs Low Frequency Output Characteristics in SE Mode RL C(C) Lowest Frequency 3 Ω 330 µF 161 Hz 4 Ω 330 µF 120 Hz 8 Ω 330 µF 60 Hz 32 Ω 330 µF 15 Hz 10,000 Ω 330 µF 0.05 Hz 47,000 Ω 330 µF 0.01 Hz As Table 1 indicates, most of the bass response is attenuated into a 4- Ω load, an 8-Ω load is adequate, headphone response is good, and drive into line level inputs (a home stereo for example) is exceptional. Furthermore, the total amount of ripple current that must flow through the capacitor must be considered when choosing the component. As shown in the application circuit, one coupling capacitor must be in series with the mono loudspeaker for proper operation of the stereo-mono switching circuit. For a 4- Ω load, this capacitor must be able to handle about 700 mA of ripple current for a continuous output power of 2 W. using low-ESR capacitors 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. |
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