UNISONIC TECHNOLOGIES CO., LTD
TA8227AP
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.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Wide operating supply voltage: V
CC
=5~12V
* Low popping noise at power ON
* Best for supply voltage 9V
* Output power
P
OUT
=2.5W/CH at Vcc=9V, R
L
=4Ω, f=1kHz, THD=10%
P
OUT
=3.0W/CH at Vcc=9V, R
L
=3Ω, f=1kHz, THD=10%
* Soft Clip
* Built-in thermal shut-down protection circuit
* Stand-by switch
ORDERING INFORMATION
Ordering Number
Lead Free Plating
Halogen Free
TA8227APL-D12-H-T
TA8227APG-D12-H-T
TA8227APL-S20-R
TA8227APG-S20-R
TA8227APL-S20-T
TA8227APG-S20-T
Package
DIP-12H
SOP-20
SOP-20
Packing
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2009 Unisonic Technologies Co., Ltd
1 of 8
QW-R107-021,D
TA8227AP
ABSOLUTE MAXIMUN RATINGS
(Ta=25°C)
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
VALUE
20
2.5
4.0
-25~+75
-55~+150
UNIT
V
A
W
°C
°C
ELECTRICAL CHARACTERISTICS
(Ta=25°C, Vcc=9V, R
L
=4Ω, R
g
=600Ω, f=1kHz, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Quiescent Current
I
CCQ
V
IN
=0
P
OUT
(1)
THD=10%
Output Power
P
OUT
(2)
THD=10%, RL=3Ω
Total Harmonic Distortion
THD
P
OUT
=0.4W/CH
Gv1
Rf=120Ω,V
OUT
=0.775Vrms (0 dBm)
Voltage Gain
Gv2
Rf=0, V
OUT
=0.775Vrms (0 dBm)
Input Impedance
R
IN
Output Noise Voltage
eN
Rg=10kΩ,BW=20Hz~20kHz
Ripple Rejection Ratio
R.R.
Rg=600Ω, fripple=100Hz
Cross Talk
C.T
Rg=600Ω,V
OUT
=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
%
dB
dB
kΩ
mVrms
dB
dB
mV
μA
1.0
60
TYP. DC VOLTAGE OF EACH TERMINAL (Vcc=9V, Ta=25°C )
TERMINAL NO.
DC VOLTAGE (V)
1
V
CC
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
V
CC
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
G
V
=
20 log
R
f
+
R
1
+
R
2
R
f
+
R
1
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)
R
f
+
-
(
C
NF
47μF
5/8
(9/12)
R1
45Ω
+
Ch-2
-
R2
OUTPUT
2/11
(2/19)
30kΩ
): For SOP-20 Package
Fig.1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 10
QW-R107-021,D
TA8227AP
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.
INPUT
-
C
IN
6/7
(10/11)
Q2 Q3
Q1
OUTPUT
30kΩ
2/11
(2/19)
+
To DRIVER
45kΩ
4
(8)
30kΩ
Pre-GND
R
f
( ): For SOP-20 Package
5/8
(9/12)
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
V
IN
=300mVrms (Typ.) : V
CC
=9V, RL=4Ω, f=1kHz : Enough care must be taken for this phenomenon.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
+
-
47μF
5 of 10
QW-R107-021,D
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
