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參數(shù)資料
| 型號： | MC34262 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Power Factor Controllers(功率因數(shù)控制器) |
| 中文描述： | 功率因數(shù)控制器（功率因數(shù)控制器） |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 394K |
| 代理商： | MC34262 |
MC34262, MC33262
http://onsemi.com
15
Figure 26. Error Amp Compensation
2
C
1
Error Amp
+
10 A
R
1
1
6
R
2
The Error Amp output is a high impedance node and is susceptible to noise pickup. To minimize pickup, compensation
capacitor C
1
must be connected as close to Pin 2 as possible with a short, heavy ground returning directly to Pin 6. When
operating at high ac line, the voltage at Pin 2 may approach the lower threshold of the Multiplier,
≈
2.0 V. If there is
excessive ripple on Pin 2, the Multiplier will be driven into cutoff causing circuit instability, high distortion and poor power
factor. This problem can be eliminated by increasing the value of C
1
.
Figure 27. Current Waveform Spike Suppression
10pF
22k
Current
Sense
Comparator
R
7
4
7
C
R
A narrow turnon spike is usually present on the leading edge of
the current waveform and can cause circuit instability. The
MC34262 provides an internal RC filter with a time constant of
220 ns. An additional external RC filter may be required in
universal input applications that are above 200 W. It is
suggested that the external filter be placed directly at the Current
Sense Input and have a time constant that approximates the
spike duration.
Figure 28. Negative Current Waveform
Spike Suppression
10pF
22k
Current
Sense
Comparator
R
7
4
7
D
1
A negative turnoff spike can be observed on the trailing edge of
the current waveform. This spike is due to the parasitic
inductance of resistor R
7
, and if it is excessive, it can cause
circuit instability. The addition of Schottky diode D
1
can
effectively clamp the negative spike. The addition of the external
RC filter shown in Figure 26 may provide sufficient spike
attenuation.
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參數(shù)描述 |
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| MC34262D | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC34262DG | 功能描述:功率因數(shù)校正 IC Critical Mode PFC w/OVP RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC34262DG | 制造商:ON Semiconductor 功能描述:Driver IC |
| MC34262DR2 | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC34262DR2G | 功能描述:功率因數(shù)校正 IC Critical Mode PFC w/OVP RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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