UTC TA7368P
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R107-009,A
0.6W AUDIO POWER AMPLIFIER
DESCRIPTION
The UTC TA7368P is suitable for the audio power amplifier
of portable cassette tape recorder and radio.
FEATURES
*Very few external components( only three capacitors)
*Low quiescent current
*High voltage gain: Gv=40dB
SIP-9
BLOCK DIAGRAM
Ripple
Rejection
2
9
7
6
4
3
1
5
Input
Negative
Feedback
Phase
Pre
GND
Power
GND
Output
Vcc
R
L
UTC TA7368P
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R107-009,A
ABSOLUTE MAXIMUN RATINGS
(Ta=25
C)
PARAMETER
SYMBOL
VALUE
UNIT
Supply Voltage
V
CC
14
V
Power Dissipation
P
D
900
mW
Operating Temperature
T
OPR
-20 ~ 75
C
Storage Temperature
T
STG
-55 ~ 150
C
Note: Derated Ta>25
C, in the proportion of 7.2mW/
C
ELECTRONIC CHARACTERISTICS
(Ta=25
C, Vcc=6V, f=1kHz, Rg=600
,RL=4
, unless otherwise
specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Quiescent Circuit
V
CC
=3V,Vin=0
5.5
Current
ICCQ
V
CC
=6V,Vin=0
6.6
mA
V
CC
=9V,Vin=0
7.5
Voltage Gain
GV
Vin=0.5mVrms
37
40
43
dB
V
CC
=3V,R
L
=4
,THD=10%
120
V
CC
=6V,R
L
=4
,THD=10%
500
720
Output Power
Pout
V
CC
=6V,R
L
=8
,THD=10%
300
450
mW
V
CC
=9V,R
L
=8
,THD=10%
800
1100
V
CC
=9V,R
L
=16
,THD=10%
450
610
Total Harmonic
Distortion
THD
Pout=100mW
0.3
1
%
Output Noise Voltage
Vno
Rg=10k
,BPF=20Hz~20kHz
0.2
0.5
mVrms
Ripple Rejection
RR
fr=100Hz,Vr=0.3Vrms,Crip=0
25
dB
Input Resistance
Rin
27
k
TERMINAL DC VOLTAGE
Pin No.
1
2
3
4
5
6
7
8
9
Value(V)
0
2.4
0.62
0.64
0
0
2.61
NC
6
PRECAUTION FOR APPLICATION
1. Input stage (Figure 1)
The input stage of power amplifier is comprised of a PNP differential pair( Q2 and Q3) preceded by a PNP emitter
follower(Q1) which allows DC referencing of the source signal to GND. 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 the voltage gain (figure 2)
The voltage gain is fixed at Gv=40dB by the resistors( R4 and R5) in IC. Its reduction is possible through adding Rf as
shown in Figure 2. In this case, the voltage gain is obtained by the following equation: Gv=20log(R5+R4+Rf)/(R4+Rf).
It is recommended to use this IC with the voltage gain of Gv=28dB or over.
UTC TA7368P
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R107-009,A
2
Pin 1
Pin 5
Pin 9
Pin 7
Pin 3
R5
R1
27
R4
Q2
Q3
Q4
Q1
D1
1
3
R5
R4
Rf
Crip
Figure 1 Figure 2 Figure 3
3. Ripple rejection (Figure 3)
Adding Crip, to the ripple terminal 2 as shown in Figure 3, the ripple rejection ratio is improved from -25dB to -45dB.
4. Power dissipation
Casre should be taken to use IC below maximum power dissipation because it may be over maximum rating
depending on operating condition.
Pd=900mW (Ta=25
C)
5. Phase-compensation
Small temperature coefficient and excellent frequency characteristics is needed by capacitor below:
*Oscillation preventing capacitor for power amplifier output
*Bypass capacitor for ripple filter
*Capacitor between Vcc and GND
TEST CIRCUIT
Ripple
Rejection
2
9
7
6
4
3
1
5
Input
Negative
Feedback
Phase
Pre
GND
Power
GND
Output
Vcc
R
L
27k
90
10k
100
F
100
F
470
F
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