LM831 datasheet(11/14 Pages) NSC

11 / 14 page

External Components (Refer to External Component Diagram)

Component

Comments

Min

Max

Required to stabilize output stage

033 mF1 mF

Output coupling capacitors for Dual Mode Sets a low-frequency pole in

100 mF

10000 mF

the frequency response

fL e

2qCcRL

CBS

Bootstrap capacitors Sets a low-frequency pole in the power BW

22 mF or

470 mF

Recommended value is

(short Pins

412to9)

CBS e

2qfLRL

Supply bypass Larger values improve low-battery performance by

47 mF

10000 mF

reducing supply ripple

CBY

Filters the supply for improved low-voltage operation Also sets

47 mF

470 mF

turn-on delay

CNF

Sets a low-frequency response Also affects turn-on delay

10 mF

100 mF

fL e

CNF(RAV a 80)

In BTL Mode CNF on Pin 15 can be reduced without affecting the

frequency response However the turn-on ‘‘POP‘‘ will be worsened

CBTL

Used only in the Bridge Mode Connects the output of the first amplifier to

01 mF1 mF

the inverting input of the other through an internal resistor Sets a low-

frequency pole in one-half the frequency response

fL e

CBTL16k

CBW

Improves clipping waveform and sets the high-frequency bandwidth

See table below

Works with an internal 16k resistor (This equation applies for RAV i 0

For 46 dB application see BW – CBW curve)

fH e

CBW16k

RAV

Used to reduce the gain and improve the distortion and signal to noise If

See table below

this is desired CBW must also be used

Typical AV

RAV

CBW

Min

Max

46 dB

Short

Open

4700 pF

40 dB

100 pF

4700 pF

34 dB

240

270 pF

4700 pF

28 dB

560

500 pF

4700 pF

LM831 Datasheet(PDF) 11 Page - National Semiconductor (TI)

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