LM831 datasheet(9/14 Pages) NSC

Part #	LM831

Description	LM831 Low Voltage Audio Power Amplifier

PDF	14 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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9 / 14 page

LM831 Circuit Description Refer to the external component diagram and equivalent schematic

The power supply is applied to Pin 9 and is filtered by resis-

tor R1 and capacitor CBY on Pin 16 This filtered voltage at

Pin 16 is used to bias all of the LM831 circuits except the

power output stage Resistor R0 generates a biasing current

that sets the output DC voltage for optimum output power

for any given supply voltage

Feedback is provided to the input transistor Q1 emitter by

R6 and R7

The capacitor CNF on Pin 2 provides unity DC gain for maxi-

mum DC accuracy

Q2 provides voltage gain and the rest of the devices buffer

the output load from Q2’s collector

Bootstrapping of Pin 5 by CBS allows maximum output

swing and improved supply rejection

R5 is provided for bridge (BTL) operation

External Component Diagram

TLH6754 – 12

LM831 Datasheet(PDF) 9 Page - National Semiconductor (TI)