UNISONIC TECHNOLOGIES CO., LTD TA8227AP
UNISONIC TECHNOLOGIES CO., LTD
TA8227AP
LINEAR INTEGRATED CIRCUIT
LOW FREQUENCY POWER
AMPLIFIER

DESCRIPTION
The UTC TA8227AP is an audio power IC with built-in two
channels developed for portable radio cassette tape recorder with
power ON / OFF switch.
Thermal shut down protection circuit is built in.

FEATURES
* Wide operating supply voltage: VCC=5~12V
* Low popping noise at power ON
* Best for supply voltage 9V
* Output power
POUT=2.5W/CH at Vcc=9V, RL=4, f=1kHz, THD=10%
POUT=3.0W/CH at Vcc=9V, RL=3, f=1kHz, THD=10%
* Soft Clip
* Built-in thermal shut-down protection circuit
* Stand-by switch

ORDERING INFORMATION
Ordering Number
TA8227APG-D12-H-T
TA8227APG-S20-R

Package
DIP-12H
SOP-20
Packing
Tube
Tape Reel
MARKING
DIP-12H
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
SOP-20
1 of 8
QW-R107-021.F
TA8227AP

LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
VCC2
1
12
OUT1
2
11
B.S.1
3
10
VCC1
VCC2
1
20
VCC1
OUT2
B.S.2
OUT1
2
19
OUT2
B.S.1
3
18
B.S.2
PW-GND
4
17
PW-GND
PW-GND
5
16
PW-GND
PW-GND
6
15
PW-GND
PW-GND
7
14
PW-GND
PRE-GND
PRE-GND
4
9
RIPPLE
8
13
RIRPLE
NF1
5
8
NF2
NF1
9
12
NF2
6
7
IN2
IN1
10
11
IN2
IN1
DIP-12H
BLOCK DIAGRAM
+
-
+
-
FIN
+
+
-

SOP-20
-
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QW-R107-021.F
TA8227AP

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUN RATINGS (TA=25C, unless otherwise specified)
PARAMETER
Supply Voltage
Output Current (peak / CH)
Power Dissipation
Operating Temperature
Storage Temperature

SYMBOL
VCC
IO(PEAK)
PD
TOPR
TSTG
VALUE
20
2.5
4.0
-25~+75
-55~+150
ELECTRICAL CHARACTERISTICS
(TA=25C, VCC=9V, RL=4Ω, RG=600Ω, f=1kHz, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Quiescent Current
ICCQ
VIN=0
POUT(1)
THD=10%
Output Power
POUT(2)
THD=10%, RL=3Ω
Total Harmonic Distortion
THD
POUT=0.4W/CH
Gv1
Rf=120Ω,VOUT=0.775Vrms (0 dBm)
Voltage Gain
Gv2
Rf=0, VOUT=0.775Vrms (0 dBm)
Input Impedance
RIN
Output Noise Voltage
eN
Rg=10kΩ,BW=20Hz ~20kHz
Ripple Rejection Ratio
R.R.
Rg=600Ω, fripple=100Hz
Cross Talk
C.T
Rg=600Ω,VOUT=0.775Vrms (0 dBm)
Input Offset Voltage
V6, V7
Standby Current
1stb
Sw1:OFF

MIN
2.0
43
TYP
21
2.5
3.0
0.2
45
56.5
30
0.3
-52
-50
30
1
MAX
45
UNIT
mA
W
1.0
47
1.0
60
50
%
dB
dB
kΩ
mVrms
dB
dB
mV
μA
TYP. DC VOLTAGE OF EACH TERMINAL (VCC=9V, TA=25C, unless otherwise specified)
TERMINAL NO.
DC VOLTAGE (V)

UNIT
V
A
W
C
C
1
VCC
2
4.5
3
8.7
4
GND
5
0.7
6
0.03
7
0.03
8
0.7
9
5.0
10
8.7
11
4.5
12
VCC
APPLICATION INFORMATION AND APPLICATION METHOD
1. Adjustment of voltage gain
The voltage gain Gv is obtained as follows by R1, R2 and Rf in Fig.1
GV  20 log
R f  R1  R 2
R f  R1
When Rf = 0Ω
Gv=56.5 dB (Typ.)
When Rf = 120Ω
Gv=45 dB (Typ.)
By increasing Rf, reduction of Gv is possible. However, since the feedback increase is liable to produce oscillation,
it is recommended to use this at 40dB or over.
INPUT
6/7
(10/11)
Rf
+
-
CNF
47μF
(
5/8
(9/12)
R1
45Ω
+
Ch-2
R2
OUTPUT
2/11
(2/19)
30kΩ
): For SOP-20 Package
Fig.1
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3 of 9
QW-R107-021.F
TA8227AP
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LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION AND APPLICATION METHOD(Cont.)
2. Thermal shut-down circuit
The thermal shut-down circuit is built in for the purpose of preventing the destruction of IC due to the abnormal
temperature rise when the heat radiation is insufficient.
The operation temperature is set at radiation Fin temperature 175C (Typ.)
At this temperature or over the bias is interrupted to prevent the destruction of IC.
+
3. Input stage
The input circuit of this IC is as shown in fig.2. PNP Tr : Q1 is provided in the input circuit so as to make its usage
possible without the input coupling capacitor.
However, at pin 6 and pin 7, max 60mV offset voltage is produced.
Application after checking volume slide noise is recommended.
For cutting the volume slide noise, insert the input capacitor: CIN in series to interrupt the DC component.
4. Oscillation preventive measures
For oscillation preventive capacitor C6 and C7 between the output terminal and GND, it is recommended to use
polyester film capacitor having good characteristics for temperature and for high frequency.
Since the characteristics of the capacitor is liable to be influenced by the temperature, use this capacitor after the
temperature test to check the oscillation allowance.
In addition, as the position of the electrolytic capacitor has a remarkable influence on the oscillation, connect C10
to Vcc at the nearest possible position from power GND.
At using this application wth the voltage gain reduced, oscillation is liable to be produced. Apply the capacitor after
checking enough for its capacity, type and mounting position.
5. Power ON / OFF switch
There is power ON / OFF switch at Pin1. However, output power is changed by Pin1 supply voltage when Pin1
supply voltage is not same Pin12 supply voltage, after referring to attached date, select Pin1 supply voltage.
6. Input voltage
When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is
VIN=300mVrms (Typ.) : VCC=9V, RL=4Ω, f=1kHz : Enough care must be taken for this phenomenon.
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QW-R107-021.F
TA8227AP

LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
+
-
+
FIN
+
-
+
-
Notes: 1. This IC can be used without coupling capacitor (CIN). If volume slide noise noise occurred by input offset
voltage is undesirable, it needs to use the capacitor (CIN).
2. The condenser between the pin4 and the GND (C11) is for reducing pop noise when the power ON / OFF
switch (SW1) is set to ON / OFF.
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QW-R107-021.F
TA8227AP

LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
ICCQ2, V2, V11 – VCC2
THD – POUT
12
12
VCC1=12V
10 VIN=0
TA=25°C
30
10
10
8
8
5
3
6
6
ICCQ
VCC1=9V
RL=4Ω
F=1kHz
RNF=120Ω
TA=25°C
6V
7V
8V
VCC2=5V
9V
3
Supply Voltage, VCC2 (V)
0.1
0.3
1
Output Power, POUT (W)
THD – TA
ICCQ2, V2, V11 – VCC2
1
4
V2, V11
4
2
2
0
0
2
4
6
8
10
12
14
0
0.5
0.3
0.1
0.01
0.5
50
0.4
40
0.3
30
0.03
10
V2, V11
0.2
20
0.1
10
ICCQ
0
-40
-20
0
20
40
60
80
0
100
Ambient Temperature, TA (°C)
-40
-20
0
20
40
60
80
Ambient Temperature, TA (°C)
ICCQ2, VOUT – VCC
80
60
40
VOUT
20
0
ICCQ
0
5
10
15
20
Supply Voltage, VCC2 (V)
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6 of 9
QW-R107-021.F
TA8227AP

LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
THD – POUT
THD – POUT
100
100
VCC=9V
RL=4Ω
RNF=120Ω
30
30
10
10
3
3
f=10kHz
1
0.3
0.1
0.01
60
9V
100Hz
0.1
80
VCC=6V
1
1kHz
0.3
f=1kHz
RL=4Ω
RNF=120Ω
0.1
0.3
1
3
10
30
0.01
0.1
0.3
1
3
Output Power, POUT (W)
Output Power, POUT (W)
GV - f
C.T. - f
0
VCC=9V
RL=4Ω
RNF=120Ω
-20
40
-40
20
-60
10
VCC=9V
RL=4Ω
Rg=600Ω
RNF=120Ω
VOUT=0.775Vrms
(0dBm)
-80
0
30
100
1k
10k
Frequency, f (Hz)
100k
30
100
1k
10k
Frequency, f (Hz)
100k
R.R. - Rg
0
-20
VCC=9V
RL=4Ω
RNF=120Ω
f=100Hz
-40
-60
-80
30
100
1k
10k
100k
Signal Source Resistance Rg (Ω)
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QW-R107-021.F
TA8227AP
LINEAR INTEGRATED CIRCUIT
Cross Talk C.T. (dB)
Output Noise Voltage Vno (mVrms)
TYPICAL CHARACTERISTICS(Cont.)

VCC - Pout
PD - Pout
6
f = 1kHz
VCC = 12V
5
RL = 6Ω
5 THD = 10%
RL = 4Ω
f = 1kHz
4
4
8Ω
3
3
9V
2
2
4Ω
1
1
0
0
5
7
9
11 13 15
17 19
Supply Voltage VCC (V)
0
0
1
2
3
4
5
6
7
Output Power Pout (W)
PD - Pout
Power Dissipation PD (W)
5
VCC = 12V
f = 1kHz
4
3
RL = 6Ω
8Ω
2
1
0
0
1
2
3
4
5
6
Output Power Pout (W)
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8 of 9
QW-R107-021.F
TA8227AP
LINEAR INTEGRATED CIRCUIT
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 parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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www.unisonic.com.tw
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QW-R107-021.F
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