8229 View Datasheet(PDF) - Unisonic Technologies

Part Name

Description

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8229

LOW FREQUENCY POWER AMPLIFIER

Unisonic Technologies 

UTC TA8229 LINEAR INTEGRATED CIRCUIT

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 11 and 12 , max 60 mV 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.

OUTPUT

INPUT

Q2 Q3

30kΩ

3/ 5

11/12

CIN

Q1

30kΩ

14/15

GND

To DRIVER

45Ω

To BIAS

NF

10/13

Rf

+ 47µF

Fig. 2

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 with the voltage gin reduced, oscillation is liable to be produced. Apply the capacitor after

checking enough for its capacity, type and mounting position.

(*) As the oscillation allowance varies according to the printed pattern layout, the standard printed board of

TOSHIBA is recommended to be referred to design it.

5. Power ON/OFF switch

There is power ON/OFF switch at ⑧pin. However, output power is changed by ⑧pin supply voltage when ⑧pin

supply voltage is not same ④pin supply voltage, after referring to attached date, select ⑧pin supply voltage.

6. Input voltage

When the excessive signal is input, turning-up is produced in the clip waveform.

The turning-up point is Vin = 300mVrms (Typ.): VCC = 9V, RL = 4Ω, f = 1kHz: Enough care must be taken for this

phenomenon.

UTC UNISONIC TECHNOLOGIES CO., LTD. 4

QW-R107-028,A

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