UNISONIC TECHNOLOGIES CO., LTD
TA8207K LINEAR INTEGRATED CIRCUIT
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Copyright © 2012 Unisonic Technologies Co., Ltd QW-R107-013.D
LOW FREQUENCY POWER
AMPLIFIER
DESCRIPTION
The UTC TA8207K is an audio power IC with built-in two channels
and thermal shut down protection circuit.
The IC is developed for portable radio cassette tape recorder with
power ON/OFF switch.
FEATURES
*High Power : POUT=2.5W / CH (Typ.)
(V
CC=9V, RL=4Ω, f=1KHz, THD=10%)
: P
OUT=4.6W / CH (Typ.)
(V
CC=12V, RL=4Ω, f=1KHz, THD=10%)
*Low Popping Noise at Power ON
*Small Quiescent Current: ICCQ=21mA (Typ.)
(V
CC=9V, VIN=0)
*Soft Clip
*Built-in Thermal Shut Down Protection Circuit
*Bast for Supply Voltage 9V, 12V
*Operation Supply Voltage Range: VCC=6-15V
ORDERING INFORMATION
Order Number Package Packing
Lead Free Halogen Free
TA8207KL-F12-H-T TA8207KL-F12-H-T FSIP-12H Tube
TA8207K LINEAR INTEGRATED CIRCUIT
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ABSOLUTE MAXIMUM RATINGS (TA=25℃, unless otherwise specified)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage VCC 20 V
Output Current (Peak / CH) IO
(
PEAK
)
2.5 A
Power Dissipation PD 12.5 W
Operating Temperature TOPR -20 to + 75 ℃
Storage Temperature TSTG -55 to + 150 ℃
ELECTRICAL CHARACTERISTICS
(VCC=9V, RL=4Ω, RG=600Ω, f=1kHz, TA=25℃, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Quiescent Current ICCQ V
IN=0 21 45 mA
Output Power POUT
(
1
)
THD=10% 2.0 2.5 W
POUT
(
2
)
V
CC=12V,THD=10% 4.6 W
Total Harmonic Distortion THD POUT=0.4W / ch 0.2 1.0 %
Output Noise Voltage eN RG=10kΩ
BW=20Hz ~ 20kHz 0.3 1.0 mVRMS
Input Resistance RIN 30 kΩ
Voltage Gain GV(1) RF=120Ω
VOUT=0.775VRMS 43 45 47 dB
GV(2) RF=0, VOUT=0.775VRMS 56.5 dB
Ripple Rejection Ratio RR RG=600Ω
Fripple=100Hz 52 dB
Cross Talk CT RG=600Ω, Amp1<->2
VOUT=0dBm, f=1kHz 50 dB
Input Offset Voltage V6,V7 30 60 mV
Stand-by Current ISTDBY SW1->OFF 1 μA
TYPICAL DC VOLTAGE OF EACH TERM INAL (VCC=9V, TA=25℃)
TERMINAL NO. 1 2 3 4 5 6 7 8 9 10 11 12
DC Voltage 8.7 4.5 VCC 5.0 0.7 0.03 0.03 0.7 GND 4.5 8.7 VCC
TA8207K LINEAR INTEGRATED CIRCUIT
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TEST CIRCUIT
123
6
5
4
7
8
10
11
9
45Ω
1
2
45Ω
R11
120Ω
30kΩ
+
-
ch - 2
ch - 1
+
-
BIAS CIRCUIT THE
RMAL SHUT DOWN
PROTECTION CIRCUIT
IN2
NF2
30kΩ
GND
+-
+-
+-
+-
+-
+-
+-
+-
+-
R12
120Ω
+-
+-
IN1
NF1
RIPPLE
VCC2
B.S.1
*1
*1
*2
C1
100μF
SW1
C11
100μF
CIN
C3
47μF
CIN
C2
47μF
C5
100μFC7
0.15μF
C9
1000μF
RL
OUT - 2
RL
C6
0.15μF
OUT - 1
C8
1000μF
C4
100μF
B.S.2
C10
1000μF
VCC1
IN - 1
IN - 2
REMARK: 1.This IC can be used without coupling capacitor (CIN). If volume slide noise occurred by input offset
voltage is undesirable, it needs to use the capacitor (CIN).
2.The condenser between the pin3 and the GND (C11) is for reducing pop noise when the power ON/OFF
switch (SW1) is set to ON/OFF.
TA8207K LINEAR INTEGRATED CIRCUIT
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APPLICATION INFORMATION
1. ADJUSTMENT OF VOLTAGE GAIN
The voltage gain GV is obtained as follows by R1, R2 and RF in Fig.1.
INPUT
6/7
5/8
CNF
- +
47μF
RFR1
45ΩR2
30kΩ
2/10
OUTPUT
+
AMP
-
R
F+R1+R2
GV=20λog
R
F+R1
When RF=0Ω G
V=56.5dB(typ.)
When RF=120Ω G
V=45dB(typ.)
Reduction of GV is possible by increasing RF. However, it is recommended to use this at 40dB or over since the
feedback increase is liable to produce oscillation.
2. THERMAL SHUTDOWN CIRCUIT
The built-in thermal shut-down circuit can prevent the destruction of IC that abnormal temperature rise when the
heat radiation is insufficient. The operation temperature is set at radiation fin temperature 175℃, at this temperature
or over the bias is interrupted to prevent the destruction of IC.
3. INPUT STAGE
Below circuit shows the input circuit of this IC.
OUTPUT
INPUT
6/7
9GND
- +
CIN
Q1
Q2 Q3
to DRIVER
to BIAS
2/10
5/8
30KΩ
NF
It is possible that without input coupling capacitor in the input circuit by use a PNP Transistor, Q1. However, 60mV
max offset voltage is produced at pin (6) and (7). Application after checking volume slide noise is recommended. In
order to cut the volume slide noise, insert the input capacitor (CIN) in series to interrupt the DC component.
TA8207K LINEAR INTEGRATED CIRCUIT
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APPLICATION IN FORMATION(Cont.)
4. OSCILLATION PREVENTIVE MEASURES
For oscillation preventive capacitor C6 and C7 between the output terminal and GND, polyester film capacitor is
recommended due to good characteristics for temperature and for high frequency. It is better that use this
capacitor after the temperature test to check the oscillation allowance due to the characteristics of the capacitor is
liable to be influenced by the temperature. Besides, as the position of the electrolytic capacitor has remarkable
influence on the oscillation, connect C10 to VCC as close power GND as possible.
At using this application with 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 (3) pin. However, output power is changed by (3) pin supply voltage when(3) pin
supply voltage I not same(12) pin supply voltage, after referring to attached date, select(3) pin 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.
7. GND LINE
GND pin is not separated for pre-GND and for PW-GND. That is liable to cause distortion and cross talk worse.
TA8207K LINEAR INTEGRATED CIRCUIT
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TYPICAL CHARACTERISTICS
RL=4Ω
VIN=0
TA=25℃
Supply Voltage, Vcc (V)
ICCQ,V2,V10-VCC
80
Quiescent Current, ICCQ (mA)
0
20
40
60
4
0812 16 20
2
4
6
8
12
10
Gv-f
80
70
60
50
40
30
20
10
0
30 100 1K 10K 100K
Frequency, f (Hz)
Voltage Gain, GV(dB)
3K 30K
VCC=9V
RL=4Ω
RNF=120Ω
TA=25℃
VCC=9V
RL=4Ω
RNF=120Ω
TA=25℃
THD - POUT
f=10kHz
100Hz
1kHz
Output Power, POUT (W)
0.10.030.01 0.3 1013
30
10
0.5
1
3
5
0.3
0.1
Total Harmoic Distortion, THD (%)
0.10.030.01
30
10
0.5
0.3
THD - POUT
VCC=12V
RL=4Ω
RNF=120Ω
TA=25℃
f=10kHz
100Hz
1kHz
1
3
5
0.3
0.1
1013
Total Harmoic Distortion, THD (%)
Output Power, POUT (W)
TA8207K LINEAR INTEGRATED CIRCUIT
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TYPICAL CHARACTERISTICS (Cont.)
4
12
Supply Voltage, VCC2 (V)
ICCQ2,V2,V10-VCC2
0
6
8
10
0
2
4
810 12 14
6
8
12
10
4
2
2
ICCQ2
V2,V10
00.10.030.01
30
10
0.5
0.3
THD - POUT
VCC1=9V
RL=4Ω
f=1kHz
RNF=120Ω
TA=25℃
1
3
5
0.3
0.1
1013
Output Power, POUT (W)
79
VCC2=5V 68
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TYPICAL CHARACTERISTICS (Cont.)
40
12
Ambient Temperature, TA(℃)
Allowable Power Dissipation, PD(W)
PD-TA
0
6
8
10
0160 180
60 80 100 120
4
2
20 140
14 (1)
(2)
(3)
(4)
(1) INFNITE HEAT SINK
(2) 80cm2 × 2mm
AL HEAT SINK
(3) 18cm2 × 2mm
AL HEAT SINK
(4) NO HEAT SINK
2
5
Output Voltage, POUT (W)
Power Dissipation, PD(W)
PD-P
OUT
0
2
3
4
03456
1
17
RL=4Ω
f=1kHz
VCC=12V
9
0
0.5
Ambient Temperature, TA(℃)
Total Harmonic Distortion, THD (%)
THD - TA
0
0.2
0.3
0.4
-40 20 40 60 80
0.1
-20 100
VCC=9V
RL=4Ω
POUT=0.4W
f=1KHz
0
50
Ambient Temperature, TA(℃)
Quiescent Current, ICCQ (mA)
ICCQ,V2,V10 - TA
0
20
30
40
-40 20 40 60 80
10
-20
VCC=9V
RL=4Ω
VIN=0
10
8
6
4
2
0
V2,V10
ICCQ
Output Voltage V2,V10 (V)
Quiescent Current, ICCQ2 (mA)
Output Voltage, V2,V10 (V)
Total Harmoic Distortion, THD(%)
TA8207K LINEAR INTEGRATED CIRCUIT
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TYPICAL CHARACTERISTICS (Cont.)
Allowable Power Dissipation, PD(W)
Power Dissipation, PD(W)
Total Harmonic Distortion, THD (%)
Quiescent Current, ICCQ (mA)
Output Voltage, V2,V10 (V)
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.
