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參數(shù)資料
| 型號： | 8229 |
| 廠商： | 友順科技股份有限公司 |
| 元件分類： | 功率放大器 |
| 英文描述： | LOW FREQUENCY POWER AMPLIFIER |
| 中文描述： | 低頻功率放大器 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 180K |
| 代理商： | 8229 |
UTC TA8229
LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R107-028,A
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.
3/ 5
INPUT
30k
OUTPUT
To DRIVER
45
To BIAS
NF
Rf
Fig. 2
+
-
47F
Q3
Q2
Q1
GND
CIN
+
-
11/12
14/15
10/13
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 = 4, f = 1kHz: Enough care must be taken for this
phenomenon.
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