UNISONIC TECHNOLOGIES CO., LTD
TA8207K
LOW FREQUENCY POWER
AMPLIFIER
DESCRIPTION
LINEAR INTEGRATED CIRCUIT
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 : P
OUT
=2.5W / CH (Typ.)
(V
CC
=9V, R
L
=4, f=1KHz, THD=10%)
: P
OUT
=4.6W / CH (Typ.)
(V
CC
=12V, R
L
=4, f=1KHz, THD=10%)
*Low Popping Noise at Power ON
*Small Quiescent Current: ICCQ=21mA (Typ.)
(V
CC
=9V, V
IN
=0)
*Soft Clip
*Built-in Thermal Shut Down Protection Circuit
*Bast for Supply Voltage 9V, 12V
*Operation Supply Voltage Range: V
CC
=6-15V
ORDERING INFORMATION
Order Number
Lead Free
TA8207KL-F12-H-T
Halogen Free
TA8207KL-F12-H-T
Package
FSIP-12H
Packing
Tube
MARKING
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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QW-R107-013.E
TA8207K
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 10
QW-R107-013.E
TA8207K
PARAMETER
Supply Voltage
Output Current (Peak / CH)
Power Dissipation
Operating Temperature
Storage Temperature
SYMBOL
V
CC
I
O(PEAK)
P
D
T
OPR
T
STG
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(T
A
=25°C, unless otherwise specified)
VALUE
20
2.5
12.5
-20 ~ + 75
-55 ~ + 150
UNIT
V
A
W
°C
°C
ELECTRICAL CHARACTERISTICS
MIN
2.0
TYP
21
2.5
4.6
0.2
0.3
30
45
56.5
52
50
30
1
60
MAX
45
UNIT
mA
W
W
%
mV
RMS
kΩ
dB
dB
dB
dB
mV
μA
(V
CC
=9V, R
L
=4Ω, R
G
=600Ω, f=1kHz, T
A
=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Quiescent Current
I
CCQ
V
IN
=0
P
OUT(1)
THD=10%
Output Power
P
OUT(2)
V
CC
=12V,THD=10%
Total Harmonic Distortion
THD
P
OUT
=0.4W / ch
Output Noise Voltage
e
N
R
G
=10kΩ, B
W
=20Hz ~ 20kHz
Input Resistance
R
IN
R
F
=120Ω
G
V
(1)
V
OUT
=0.775V
RMS
Voltage Gain
G
V
(2)
R
F
=0, V
OUT
=0.775V
RMS
R
G
=600Ω
Ripple Rejection Ratio
RR
Fripple=100Hz
R
G
=600Ω, Amp1<->2
Cross Talk
C
T
V
OUT
=0dBm, f=1kHz
Input Offset Voltage
V6,V7
Stand-by Current
ISTDBY SW1->OFF
1.0
1.0
47
43
TYPICAL DC VOLTAGE OF EACH TERMINAL
(V
CC
=9V, T
A
=25°C, unless otherwise specified)
1
8.7
2
4.5
3
V
CC
4
5.0
5
0.7
6
0.03
7
0.03
8
0.7
9
GND
10
4.5
11
8.7
12
V
CC
TERMINAL NO.
DC Voltage
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QW-R107-013.E
TA8207K
TEST CIRCUIT
SW1
LINEAR INTEGRATED CIRCUIT
V
CC1
C11
100μF
3
IN1
6
45Ω
5
C1
100μF
R11
120Ω
NF1
30kΩ
4
+
C3
47μF
-
RIPPLE
BIAS CIRCUIT THE
RMAL SHUT DOWN
PROTECTION CIRCUIT
+
-
-
C6
0.15μF
R
L
+
ch - 1
2
+
*2
-
+ -
+
-
C10
1000μF
V
CC2
12
1
B.S.1
C4
100μF
C8
1000μF
+ -
+
OUT - 1
IN - 1
-
*1 C
IN
IN - 2
7
8
IN2
45Ω
*1 C
IN
R12
120Ω
+
ch - 2
-
11
30kΩ
9
GND
10
C5
100μF
B.S.2
-
+
C9
1000μF
+ -
OUT - 2
C7
0.15μF
R
L
C2
47μF
REMARK: 1.This IC can be used without coupling capacitor (C
IN
). If volume slide noise occurred by input offset
voltage is undesirable, it needs to use the capacitor (C
IN
).
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
+ -
+
-
NF2
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QW-R107-013.E
TA8207K
APPLICATION INFORMATION
1. ADJUSTMENT OF VOLTAGE GAIN
The voltage gain G
V
is obtained as follows by R1, R2 and R
F
in Fig.1.
INPUT
6/7
R
F
C
NF
47μF
+
LINEAR INTEGRATED CIRCUIT
+
R1
45Ω
AMP
-
R2
30kΩ
OUTPUT
2/10
5/8
G
V
=20λog
R
F
+R1+R2
R
F
+R1
When R
F
=0Ω
G
V
=56.5dB(typ.)
When R
F
=120Ω
G
V
=45dB(typ.)
Reduction of G
V
is possible by increasing R
F
. 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
Q2
INPUT
6/7
9
Q1
to BIAS
NF 5/8
Q3
30KΩ
2/10
to DRIVER
-
+
C
IN
GND
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 (C
IN)
in series to interrupt the DC component.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R107-013.E
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