UTC8227 LINEAR INTEGRATED CIRCUIT

YOUW ANG ELECTRONICS CO.LTD

1

LOW FREQUENCY POWER

AMPLIFIER

DESCRIPTION

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,RL=4ohm ,f=1kHz,Thd=10%

*Soft Clip

*Built-in Thermal shut-down protection circuit

*Stand-by Switch

HDIP-12

TEST CIRCUIT

30kΩ

30kΩ

45Ω

45Ω

Input 1

NF1

Ripple

Input 2NF2

Bootstrap 1

Output 1

Bootstrap 2

Output 2

RL

RL

120Ω

120Ω

47µ

F

47µ

F

47µ

F

100µ

F10

0µF

0.01

5µF

0.01

5µF

1000µF

1000µF

100µ

F

1000µ

F

Vcc1

Vcc2SW1

PowerGND

PreGND

6

5

7

8

9

TAB 4

3

2

10

11

1 12

UTC8227 LINEAR INTEGRATED CIRCUIT

YOUW ANG ELECTRONICS CO.LTD

2

ABSOLUTE MAXIMUM RATINGS(Ta=25°C)

Characteristic Symbol Value Unit

Supply Voltage Vcc 20 V

Output Current Io 2.5 A

Power Dissipation(note) Pd 4 W

Operating Temperature Topr -20 ~ +75 °C

Storage Temperature Tstg -55 ~ +150 °C

Note: Value for mounting on PC board

ELECTRICAL CHARACTERISTICS

(Ta=25°C,Vcc=9V,RL=4Ω,Rg=600Ω,f=1kHz,unless otherwise specified)

Characteristic Symbol Test Conditions Min Typ Max Units

Quiescent current Icc Vi=0 21 45 mA

THD=10%,RL=4Ω 2.0 2.5 WOutput Power Po

THD=10%,RL=3Ω 3.0 W

Total Harmonic Distortion THD Po=0.4W/CH 0.2 1.0 %

Gv1 Rf=120Ω,Vout=0.775Vrms 43 45 47 dBVoltage Gain

Gv2 Rf=0,Vout=0.775Vrms 56.5

Input Impedance Rin 30 Ω

Output Noise Voltage Vno Rg=10kΩ,BW=20Hz~20kHz 0.3 1.0 mVrms

Ripple Rejection Ratio R.R Rg=600Ωfripple=100Hz 52 dB

Cross Talk C.T Rg=600Ω,Vout=0, f=1kHz 50 dB

Input Offset Voltage V7,8 30 60 mV

Standby Current Sw1:OFF 1 µA

UTC8227 LINEAR INTEGRATED CIRCUIT

YOUW ANG ELECTRONICS CO.LTD

3

TYPICAL PERFORMANCE CHARACTERISTICS

0 3 6 9 12 15

0

3

6

9

12

15

Vcc1=12VVin=0Ta=25

ICCQ, V2,V10 vs. VCC1

Supply Voltage , Vcc2 (V)

Qui

esce

ntcu

rren

t(m

A)

0

3

6

9

12

15

Out

putV

olta

ge(V

)

ICCQ

V10,V2,

Output Power (W)

Tot

alH

arm

onic

Dis

tort

ion

(%)

0.1

1

10

0.01 0.1 1 10

THD vs Output Power

Vcc2=5V

6V

9VVcc1=9VRL=4Ωf=1kHzRNF=120ΩTa=25

ICCQ, DC Vout vs. Supply Voltage

0 5 10 15 20 25

Supply Voltage , Vcc2 (V)

0

20

40

60

80

100

Qui

esce

ntcu

rren

t(m

A)

Vin=0

Vout

ICCQ

0

4

8

12

16

20

Out

putV

olta

ge(V

)

Voltage Gain vs. Frequency

Frequency ( Hz)

Vol

tage

Gai

n(d

B)

101

102

103

104

105

0

20

40

60

80 Vcc=9VRL=4ΩRNF=120Ω

Frequency ( Hz)10

110

210

310

410

5

Vol

tage

Gai

n(d

B)

-80

-60

-40

-20

0

Ripple Rejection vs. frequency

Vcc=9VRL=4ΩRNF=120ΩRg=620Ω

Frequency ( Hz)10

110

210

310

410

5

Cro

ssT

alk

(dB

)

-80

-60

-40

-20

0

Cross Talk vs. Frequency

Vcc=9VRL=4ΩRNF=120ΩRg=620ΩVout=0dBm

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=4Ωf=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=120Ωthe Gain is equal to 45dB.