KIA6278F データシートの表示（PDF） - KEC

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KIA6278F

1W SINGLE AUDIO POWER AMPLIFIER

KEC 

KIA6278P/S/F

PRECAUTION FOR USE AND APPLICATION

1) Input Stage

The input stage of power amplifier (Equivalent circuit)

is comprised of a PNP differential pair (Q2 and Q3) pre-

ceded by a PNP emitter follower (Ql) which allows DC

referencing of the source signal to ground.

This eliminates the need for an input coupling capacitor.

However, in case the brush noise of volume becomes

a problem, provide serially a coupling capacitor to the

input side.

2) Adjustment of Voltage Gain

The voltage gain is fixed at Gv=40dB by

the resistors (R4 and R5) in IC, however, its

reduction is possible through adding Rf as

shown in Fig 2. In this case, the voltage

gain is obtained by the following Equation.

Gv

=

20

log

R5 + R4 +

R4 + Rf

Rf

It is recommended to use this IC with the voltage

gain of Gv=28dB or over.

VINO

3) Ripple Rejection Ratio

Adding CRIP, to terminasl 2 as shown Fig 3,

the Ripple Rejection ratio is improved from

-25dB Typ. to -45dB Typ.. (in case of CRIP=100//F).

Refer to R.R. vs. f characteristics.

R5 FROM PIN 7

Q2 Q3 I—f-^VNA/

;r4

Fig. 1

Fig. 2

1999. 1. 11

Revision No : 1

KEC

4/5

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