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參數(shù)資料
| 型號(hào)： | MC34262P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | POWER FACTOR CONTROLLERS |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 391K |
| 代理商： | MC34262P |
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MC34262 MC33262
14
MOTOROLA ANALOG IC DEVICE DATA
Figure 25. Error Amp Compensation
2
C1
Error Amp
+
10
μ
A
R1
1
6
R2
The Error Amp output is a high impedance node and is susceptible to noise pickup. To minimize pickup, compensation capacitor C1 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 cut–off causing
circuit instability, high distortion and poor power factor. This problem can be eliminated by increasing the value of C1.
Figure 26. Current Waveform Spike Suppression
10pF
22k
Current
Sense
Comparator
R7
4
7
C
R
A narrow turn–on 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 27. Negative Current Waveform
Spike Suppression
10pF
22k
Current
Sense
Comparator
R7
4
7
D1
A negative turn–off spike can be observed on the trailing edge of the current
waveform. This spike is due to the parasitic inductance of resistor R7, and if it
is excessive, it can cause circuit instability. The addition of Shottky diode D1
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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| MC34262PG | 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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| MC34268D | 功能描述:低壓差穩(wěn)壓器 - LDO 2.85V 800mA SCSI-2 RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MC34268DG | 功能描述:低壓差穩(wěn)壓器 - LDO 2.85V 800mA SCSI-3 Active Terminator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MC34268DR2 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.85V 800mA SCSI-4 RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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