STK4048XI(1997) データシートの表示（PDF） - SANYO -> Panasonic

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STK4048XI
(Rev.:1997)

AF Power Amplifier (Split Power Supply) (150W min, THD = 0.008%)

SANYO -> Panasonic 

STK4048XI

R1, C1

C2

R2

Input filter circuit

• Used to reduce noise at high frequencies.

Input coupling capacitor

• Used to block DC current. When the reactance of the capacitor increases at low frequencies, the dependence of 1/f noise on signal source

resistance causes the output noise to worsen. It is better to decrease the reactance.

Input bias resistor

• Used to bias the input pin to zero.

• Affects VN stability. (See NF circuit.)

• Because of differential input, this resistor fixes the input resistance practically.

NFB circuit (AC NF circuit). It is desirable that the error of the resistor value is 1% or less.

R4, R5

C3 (C2)

R3

R6, C7

R7, C4

C6, C9

C4

C5

C8, C10

R9, C13

C11, C12

L1, R14

R10, R11

R12, R13

C3

: Capacitor for AC NF

R4, R5 : Used to set VG

• VG setting obtained by using R4, R5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VG

=

log 20

⋅

R-----5

R4

( 40

dB

is

r

e

c

o

mm

e

n

de

d˙)

• Low cutoff frequency setting obtained by using, R4, C3. . . . . . . . . . . . . . . . . . . . . . . fL = 2----π-----⋅---R--1--4----⋅---C----3-(Hz)

• Change of VG setting

• It is desirable to change R4. In this case, the low cutoff frequency setting needs to be rechecked.

• When VG setting is changed by changing R5, R5 must be made equal to R2 to ensure VN balance. If the resistor value is increased

more than the existing value, it may be hard to ensure VN balance and the temperature characteristic of VN may be also deteriorated.

First-stage constant-current bias resistor

Used for oscillation blocking and phase compensation

Used for oscillation blocking and phase compensation

(C4 : A polyester film capacitor is recommended.)

Used for oscillation blocking and phase compensation

(Must be connected near the pin)

C6 : Power amp on (+) side

C9 : Power amp on (–) side

Used for oscillation blocking and phase compensation

(Used for oscillation blocking before clip)

Used for oscillation blocking and distortion improvement

Ripple filter circuit on (+) side

Ripple filter circuit on (–) side

Used for oscillation blocking

• Used to decrease the power supply impedance to operate the IC stably. Must be connected near the IC pin. It is desirable to use an

electrolytic capacitor.

Used for oscillation blocking

Output limiting resistors

No. 2909—6/8

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