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LM2876T データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM2876T
部品情報  Overture??Audio Power Amplifier Series High-Performance 40W Audio Power Amplifier w/Mute
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2876T データシート(HTML) 6 Page - National Semiconductor (TI)

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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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