UNISONIC TECHNOLOGIES CO., LTD
TA7368P
LINEAR INTEGRATED CIRCUIT
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Copyright © 2010 Unisonic Technologies Co., Ltd QW-R107-009,E
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 T hree Cap acitors)
* Low Quiescent Current
* High Voltage Gain: Gv=40dB
ORDERING INFORMATION
Ordering Number
Lead Free Halogen Free Package Packing
TA7368PL-D08-T TA7368PG-D08-T DIP-8 Tube
TA7368PL-G09-T TA7368PG-G09-T SIP-9 Tube
TA7368PL-R10-R TA7368PG-R10-R SSOP-10 Tape Reel
TA7368PL-R10-T TA7368PG-R10-T SSOP-10 Tube
TA7368PL-S08-R TA7368PG-S08-R SOP-8 Tape Reel
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PIN CONFIGURATIONS
SOP-8/DIP-8
SIP-9
RIPPLE
NF
PHASE
PRE-GND
PWR-GND
NC
VCC
POUT
VIN
SSOP-10
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BLOCK DIAGRAMS
Note: Pin connection
DIP-8/SOP-8: PIN⑧:VCC
SIP-9: PIN⑧: NC, PIN⑨:VCC
Note: Pin connection for SSOP-10 package onl y.
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ABSOLUTE MAXIMUN RATINGS (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage VCC 14 V
DIP-8 900
SIP-9 950
Power Dissipation SOP-8/SSOP-10 PD 400 mW
Operating Temperature TOPR -20 ~ +75 °C
Storage Temperature TSTG -55 ~ +150 °C
Note: 1.
2.
Absolute maximum ratings are those values beyond which the device cou ld be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
Derated Ta>25°C, in the proportion of 7.2mW/ °C
ELECTRONIC CHARACTERISTICS
(Ta=25°C, Vcc=6V, f=1kHz, Rg=600Ω, RL=4Ω, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
VCC=3V,VIN=0 5.5
VCC=9V,VIN=0 6.6 18
Quiescent Circuit Current ICCQ VCC=14V,VIN=0 7.5 21
mA
Voltage Gain GV V
IN=0.5mVrms 37 40 43 dB
VCC=3V,RL=4Ω,THD=10% 120
VCC=6V,RL=4Ω,THD=10% 500 720
Output Power POUT VCC=9V,RL=8Ω,THD=10% 800 1100
mW
Total Harmonic Distortion THD POUT=100mW 0.3 1 %
Output Noise Voltage eN RG=10kΩ,BPF=20Hz~20kHz 0.2 0.5 mVrms
Ripple Rejection RR fR=100Hz, VR=0.3Vrms,Crip=0 25 dB
Input Resistance RIN 27 kΩ
TERMINAL DC VOLTAGE
Typical terminal voltage at no signal with test circuit (VCC=6V, Ta=25 °C)
Pin No. 1 2 3 4 5 6 7 8 9
DC Voltage(V) 0 2.4 0.62 0.64 0 0 2.61 NC 6
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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 si gn al to GND. This eliminat es the need for an i nput couplin g
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 thro ugh 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.
Figure 1 Figure 2 Figure 3
3. Ripple Rejection (F igure 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 e xcellent frequency characteristics is needed by capacitor below:
*Oscillation preventing capacitor for power amplifier output
*Bypass capacitor for ripple filter
*Capacitor between Vcc and GND
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TEST CIRCUITS
27k
90 100 F
100 F
27k
90 100 F
100 F
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UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other param eters) li sted in products specificati ons of any and all UTC products descri bed or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malf unction of t hese product s can be reasonably expect ed t o result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The inf ormation
presented in this document does not f orm part of any quotation or contract, is bel iev ed to be accurate
and reliable and may be changed without notic e.
