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8229

LOW FREQUENCY POWER AMPLIFIER

Unisonic Technologies 

UTC TA8229 LINEAR INTEGRATED CIRCUIT

ELECTRICAL CHARACTERISTICS

(VCC=9V, RL=4Ω, Rg=600Ω, f=1kHz, Ta=25℃, Rf=120Ω, unless otherwise specified.)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

Quiescent Current

ICCQ

Vin = 0

Output Power

Pout (1) THD = 10%

2.0

Pout (2) THD = 10%, VCC = 12V

Total Harmonic Distortion

THD Pout = 0.4W/ch

Voltage Gain

GV (1) Rf = 120Ω, Vout = 0.775Vrms (0dBm) 43

GV (2) Rf = 0, Vout = 0.775Vrms (0dBm)

Input Resistance

RIN

Output Noise Voltage

Vno

Rg = 10kΩ, BW = 20Hz ~ 20kHz

Ripple Rejection Ratio

R.R.

Rg = 600Ω, fripple = 100kHz

Cross Talk

C.T.

Rg = 600Ω, amp1

2

Vout = 0.775Vrms (0dBm)

Input Offset Voltage

V11, V12

Stand-by Current

IOFF

SW1 OFF

TYP

21

2.5

4.6

0.2

45

56.5

30

0.3

-52

-50

30

1

MAX UNIT

45 mA

W

1.0

%

47

dB

kΩ

1.0 mVrms

dB

dB

60 mV

µA

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.

Rf + R1 + R2

GV = 20 log

Rf + R1

When Rf = 0Ω, GV = 56.5dB (Typ.)

When Rf = 120Ω, GV = 45dB (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

11/12

Rf

R1

10/13

45Ω

+ CNF

47µF

+

AMP

-

R2

30kΩ

OUTPUT

3/5

Fig.1

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℃(Typ.). At this temperature or over the bias is

interrupted to prevent the destruction of IC.

UTC UNISONIC TECHNOLOGIES CO., LTD. 3

QW-R107-028,A

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