전자부품 데이터시트 검색엔진 |
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LM2876T 데이터시트(PDF) 6 Page - National Semiconductor (TI) |
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LM2876T 데이터시트(HTML) 6 Page - National Semiconductor (TI) |
6 / 19 page Equivalent Schematic (excluding active protection circuitry) External Components Description ( Figures 1, 2) Components Functional Description 1. R IN Acts as a volume control by setting the voltage level allowed to the amplifier’s input terminals. 2. R A Provides DC voltage biasing for the single supply operation and bias current for the positive input terminal. 3. C A Provides bias filtering. 4. C Provides AC coupling at the input and output of the amplifier for single supply operation. 5. R B Prevents currents from entering the amplifier’s non-inverting input which may be passed through to the load upon power-down of the system due to the low input impedance of the circuitry when the under-voltage circuitry is off. This phenomenon occurs when the supply voltages are below 1.5V. 6. C C (Note 15) Reduces the gain (bandwidth of the amplifier) at high frequencies to avoid quasi-saturation oscillations of the output transistor. The capacitor also suppresses external electromagnetic switching noise created from fluorescent lamps. 7. Ri Inverting input resistance to provide AC Gain in conjunction with R f1. 8. Ci (Note 15) Feedback capacitor. Ensures unity gain at DC. Also a low frequency pole (highpass roll-off) at: f c = 1/(2πRi Ci) 9. R f1 Feedback resistance to provide AC Gain in conjunction with Ri. 10. R f2 (Note 15) At higher frequencies feedback resistance works with C f to provide lower AC Gain in conjunction with Rf1 and Ri. A high frequency pole (lowpass roll-off) exists at: f c = [Rf1 Rf2 (s + 1/Rf2Cf)]/[(Rf1 +Rf2)(s + 1/Cf(Rf1 +Rf2))] 11. C f (Note 15) Compensation capacitor that works with R f1 and Rf2 to reduce the AC Gain at higher frequencies. DS011775-6 www.national.com 6 |
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