KIA6278S (KEC)
1W SINGLE AUDIO POWER AMPLIFIER

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K" E C
SEMTEICCHONINCADL UDCATTAOR
KIA6278P/S/F
BIPOLAR LINEAR INTEGRATED CIRCUIT
1W SINGLE AUDIO POWER AMPLIFIER
KIA6278P/S/F are suitable for the audio power
amplifier of portable radio cassette.
FEATURES
* Very few external parts counts
(only three capacitor)
* Low Quiescent Current
:IccQ=6.6mA(Typ.) (Vcc=6V)
* Wide operationg supply voltage range.
:Vcc=2~10V
* Output Power
:POUT=720mW(TyP.) (Vcc=6V, RL=4&, THD=10%)
* Voltage Gain : Gv=40dB(Typ.)
MAXIMUM RATINGS (Ta=25°C)
CHARACTERISTIC
SYMBOL RATING UNIT
Supply Voltage
Power Dissipation
(Peakage Limitation)
(Note)
KIA6278P
KIA6278S
KIA6278F
Vcc
PD
14 V
900
950 mW
400
Operating Temperature
T0pr
-25-75
°C
Storage Temperature
Tstg - 5 5 - 1 5 0 °C
Note : Derated above Ta=25°C in the proportion of 7.2mW/°C.
8
L1—1 1 1 1
r
iii i 1
5
1 1—1
11
-m
1 11
u
DIM
A
B
D
d
G
H
MILLIMETERS
9.6±0.2
6.45±0.2
1.52±0.1
0.46±0.1
0 . 5 0 MIN
3.8±0.3
L 3.3±0.3
P 2.54
T 0.25 + 0 . 1 / - 0 . 0 5
W 7.62
? 0 - 15"
DIP — 8
DIM
A
B
D
d
G
H
L
P
T
MILLIMETERS
22.48± 0.2
3.2± 0.2
1.2± 0.25
0.5± 0.1
1.95± 0.2
7. 7 ± 0 . 3
3.2± 0.3
2.54
0.25+0.1/-0.05
SIP — 9
1999. 1. 11
Revision No : 1
H H j H H"
,a. .t.il.t.i HJ_
rj u 1
DIM
A
B1
B2
D
G
H
L
P
T
MILLIMETERS
4.85± 0.2
3.94± 0.2
6.02± 0.3
0.4± 0.1
0.15+0.1/—0.05
1.63+0.2
0.65+0.2
1.27
0.20 + 0 . 1 / - 0 . 0 5
KEC
FLP-8
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KIA6278S (KEC)
1W SINGLE AUDIO POWER AMPLIFIER

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KIA6278P/S/F
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vcc=6V, f=lkHz, Rg=600^, RL=4^, Ta=25°C)
CHARACTERISTIC
SYMBOL
TEST
CIRCUIT
TEST CONDITION
Vcc=3V, ViN=0V
MIN. TYP. MAX. UNIT
- 5.5 -
Quiescent Current
ICCQ
-
Vcc=6V, ViN=0V
- 6.6 15 M A
Vcc=9V, ViN=0V
- 7.5 18
Vcc=3V, RL=4 Q, THD=10%
-
120 -
Vcc=6V, RL=4 Q, THD=10% 500 720 -
Output Power
POUT
-
Vcc=6V, RL=8 Q, THD=10% 300 450 -
mW
Vcc=9V, RL=8 Q, THD=10% 800
1100 -
Vcc=9V, RL=16&, THD=10% 450 610 -
Total Harmonic Distortion
THD
-
POUT=100mW
- 0.3 1.0 %
Voltage Gain
Gv - VlN=0.5mVrms
37 40 43 dB
Output Noise Voltage
Ripple Rejection Ratio
Input Resistance
VNO
R.R.
RIN
-
-
-
Rg=10k^, BW=20Hz~20kHz
fRIP=100Hz, VRIP=0.3Vrms
Without CRIP
-
-
-
0.2 0.5 MVRMS
25 -
dB
27 -
TYPICAL VOLTAGE OF EACH TERMINAL (KIA6278S)
(Vcc=6V, Ta=25°C, by test circuit)
TERMINAL NO.
1
2
3
4
5
6
DC Voltage
0
2.40 0.62 0.64
0
0
(unit:V)
789
2.61 NC
6.0
1999. 1. 11
Revision No : 1
KEC
2/5


KIA6278S (KEC)
1W SINGLE AUDIO POWER AMPLIFIER

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KIA6278P/S/F
TEST CIRCUIT & BLOCK DIAGRAM
VCC
Note : The Vcc of KIA6278S is pin
The Vcc of KIA6278P/F are pin (8).
1999. 1. 11
Revision No : 1
KEC
3/5


KIA6278S (KEC)
1W SINGLE AUDIO POWER AMPLIFIER

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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


KIA6278S (KEC)
1W SINGLE AUDIO POWER AMPLIFIER

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KIA6278P/S/F
T H D - POUT ( 1 )
PnH 30 f=lkHz
RL=4Q
o
HHtHf
OHt/3
10 Ta=25'C
5
3
HPH
O
HH
l
CD
- II
£
O 0.5
5Hi 0.3
0.1
HOH 0.003 0.01 0.03 0.1 0.3 1
OUTPUT POWER PQUT 0 0
T H D - POUT ( 3 )
0.003 0.01 0.03 0.1 0.3 1
OUTPUT POWER PQUT 0 0
P D - POUT ( 2 )
1.0
Q
PL
£O 0.8
HHO 0.6
EGHO
3
0.4
TF
0.2
o
PL, 0
0
Vcc=6V
f=lkHz
Ta=25'C
Rl=8Q
*
Rl=160
THn= 1 <2 THD =10%
/ CJ
0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT POWER PQUT 0 0
1.4
£
p
T H D - POUT ( 2 )
wH
o
HH
E« H
o
EH
CO
HPH
u
HH
o
2
o 0.003 0.01 0.03 0.1 0.3 1
EH OUTPUT POWER PQUT 0 0
P D " POUT ( 1 )
1.0
o
PL,
0.8
Vcc=6V
f=lkHz
Ta=25'C
o
HH
E« H 0.6
o
THD=1% THD =10%
EGHQ 0.4
,—
o 0.2
PL, 0
t/ / / / /
RL=40
RL=8n
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT POWER PQUT 0 0
£
P D MAX - Vcc
Q
PL,
o
HH
E« H
o
EwH
HpH
«
o
PL,
p
2 0 2 4 6 8 10 12 14
SUPPLY VOLTAGE VCC (V)
1999. 1. 11
Revision No : 1
KEC
5/5




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