UTC8227
LOW FREQUENCY POWER
AMPLIFIER
DESCRIPTION
LI
NEAR I
NTEGRATED CI
RCUI
T
The UTC8227 is the audio power amplifier with built-in
two channel developed for portable radio cassette tape
recorder with power ON/OFF switch.
FEATURES
*Wide operating supply voltage: Vcc=5~12V
*Low quiescent supply current
(Icc=21mA,typical,at Vcc=9V ,Vi=0)
*Output power
Po=2.50W/CH at Vcc=9V,R
L
=4ohm ,f=1kHz,Thd=10%
*Soft Clip
*Built-in Thermal shut-down protection circuit
*Stand-by Switch
HDIP-12
TEST CIRCUIT
SW1
1000µF
100µF
Vcc2
Vcc1
1
12
3
Boot
strap 1
100µF
1000µF
Input 1
6
NF1
47µF
120
Output 1
5
9
45
30k
0.015µF
2
RL
Ripple
47µF
7
Input 2
NF2
100µF
10
11
Boot
strap 2
1000µF
Output 2
8
47µF
120
0.015µF
45
30k
RL
TAB
Pre
GND
4
Power
GND
YOUW ANG ELECTRONI CO.
CS
LTD
1
UTC8227
Characteristic
Supply Voltage
Output Current
Power Dissipation(note)
Operating Temperature
Storage Temperature
Note: Value for mounting on PC board
LI
NEAR I
NTEGRATED CI
RCUI
T
Symbol
Vcc
Io
Pd
Topr
Tstg
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
Value
20
2.5
4
-20 ~ +75
-55 ~ +150
Unit
V
A
W
°C
°C
ELECTRICAL CHARACTERISTICS
(Ta=25°C,Vcc=9V,RL=4Ω,Rg=600Ω,f=1kHz,unless otherwise specified)
Characteristic
Quiescent current
Output Power
Total Harmonic Distortion
Voltage Gain
Input Impedance
Output Noise Voltage
Ripple Rejection Ratio
Cross Talk
Input Offset Voltage
Standby Current
Symbol
Icc
Po
THD
Gv1
Gv2
Rin
Vno
R.R
C.T
V7,8
Vi=0
Test Conditions
THD=10%,RL=4Ω
THD=10%,RL=3Ω
Po=0.4W/CH
R
f
=120Ω,Vout=0.775Vrms
R
f
=0,Vout=0.775Vrms
Min
2.0
Typ
21
2.5
3.0
0.2
Max
45
Units
mA
W
W
1.0
47
%
dB
Ω
43
45
56.5
30
Rg=10kΩ,BW=20Hz~20kHz
Rg=600Ω
fripple=100Hz
0.3
52
50
30
1.0
mVrms
dB
dB
Rg=600Ω,Vout=0, f=1kHz
60
mV
µA
Sw1:OFF
1
YOUW ANG ELECTRONI CO.
CS
LTD
2
UTC8227
ICCQ, V2,V10 vs. VCC1
15
15
10
LI
NEAR I
NTEGRATED CI
RCUI
T
THD vs Output Power
Total Harmonic Distortion (%)
Cross Talk vs. Frequency
Vcc=9V
R
L
=4
R
NF
=120
Rg=620
Vout=0dBm
TYPICAL PERFORMANCE CHARACTERISTICS
Vcc1=12V
Vin=0
Ta=25k
6V
Quiescent current (mA)
12
I
CCQ
12
Output Voltage (V)
Cross Talk (dB)
9
9
1
Vcc1=9V
RL=4
f=1kHz
RNF=120
Ta=25k
Vcc2=5V
9V
0
-20
6
6
-40
3
V
10
,V
2,
3
-60
0
0
3
6
9
12
15
0
0.1
0.01
0.1
1
10
-80
1
10
2
10
3
10
4
10
5
10
Supply Voltage , Vcc2 (V)
Output Power (W)
Frequency ( Hz)
ICCQ, DC Vout vs. Supply Voltage
100
20
Voltage Gain vs. Frequency
Ripple Rejection vs. frequency
Vin=0
Quiescent current (mA)
80
16
80
Output Voltage (V)
Voltage Gain (dB)
Voltage Gain (dB)
Vcc=9V
R
L
=4
R
NF
=120
0
60
12
60
-20
Vcc=9V
R
L
=4
R
NF
=120
Rg=620
Vout
40
8
40
-40
20
I
CCQ
4
20
-60
0
0
5
10
15
20
25
0
0
1
10
2
10
3
10
4
10
5
10
-80
1
10
2
10
3
10
4
10
5
10
Supply Voltage , Vcc2 (V)
Frequency ( Hz)
Frequency ( Hz)
APPLICATION INFORMATION
1.Input Voltage
When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is
Vin=300mVrms(Typical) at Vcc=9V,RL=4Ω
f=1kHz. Enough care must be taken for this phenomenon.
2.Power ON/OFF
There is power ON/OFF switch at pin 1. However output power is changed by pin 1 supply voltage when
pin1 supply voltage is not same pin 12 supply voltage, after referring to attached date, select pin 1 supply voltage.
3.Voltage Gain
The voltage gain can be changed by the external negative feedback resistor. When Rf=0, the Gain is equal
to 56.5dB.When Rf=120Ω
the Gain is equal to 45dB.
YOUW ANG ELECTRONI CO.
CS
LTD
3
TI Technology Forum
京公网安备 11010802033920号
EEWORLD
