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参数资料
| 型号： | TA8258HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM12 |
| 封装： | 1.78 MM PITCH, LEAD FREE, PLASTIC, HZIP-12 |
| 文件页数： | 7/13页 |
| 文件大小： | 345K |
| 代理商： | TA8258HQ |
TA8258HQ
2006-10-23
3
2.
Muting
This product has an excellent muting system.
(1) Audio muting
This IC is possible to make audio muting operation by using 11 pin muting terminal.
Figure 3 shows the equivalent circuit in the muting circuit.
By reducing the voltage of 11 pin to 2.8 V or less, Q1 will be ON.
Also the base voltage of Q2 in the differential circuit that has Q2 and Q3 will be down.
When Q2 is OFF, I2 and I5 dummy circuits will be operated, and it will shut down the input.
However, the bias circuit is operating after muting, and it takes power supply current at no signal.
8 pin is the capacitor terminal for reducing the pop noise, and it can make the time constant longer by
inserting the capacitor externally. If 11 pin is not used, connect 11 pin and 8 pin, then set the voltage
abode 4 V.
(2) IC internal muting at VCC OFF
When VCC = 8 V or less at VCC off, the detection circuit at VCC off is operated. And the base voltage of
Q1 is reduced and the muting is operated in IC.
3.
The Mounting Place of an Integrated Circuit
This IC cannot withstand the strong electromagnetic fields generated by a CRT. These are likely to cause
the device to exhibit malfunctions such as leakage.
Please ensure that the IC is kept away from CRT.
4.
Preventive Measures Against Oscillation
To prevent oscillation, it is advisable to use capacitors made of polyester film, which have low
temperature and frequency fluctuation characteristics, as C.
The resistance R in series with C performs phase correction at high frequencies and improves the
oscillation allowance.
(1)
Capacitor rating and type
(2)
PCB layout
Note 1: Since the oscillation allowance varies according to the PCB layout, it is recommended that a standard
Toshiba PCB be used as a reference for design.
Figure 3
Mute. TC
20 k
400
100
11
The detection
circuit at
VCC → OFF
I1
I2
Q8
8
2/4
1/5
I3
I5
I6
9
I7
Mute
IN
NF
OUT
VCC
Reference
voltage
Q11
I4
30
k
Q6
30 k
The
reference
voltage is
equal.
Main amp.
Dummy amp.
Q4
Q2 Q3
Q1
Q5
Q9
Q10
Q7
7/12
相关PDF资料 |
PDF描述 |
|---|---|
| TA8258H | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM12 |
| TA8259H | 24 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TA8260AH | 27 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TA8261AH | 40 W, 4 CHANNEL, AUDIO AMPLIFIER, PZIP25 |
| TA8261H | AUDIO AMPLIFIER, PZFM25 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TA8258HQ(5) | 功能描述:音频放大器 20W x 2ch Gen Audio Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TA8258HQ_06 | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Dual Audio Power Amplifier |
| TA8259 | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:MAX POWER 37 W BTL x 4CH AUDIO POWER IC |
| TA8259H | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:MAX POWER 37 W BTL x 4CH AUDIO POWER IC |
| TA8260AH | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Max Power 40 W BTL 】 4CH Audio Power IC |
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