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參數資料
| 型號： | NCP1217D100R2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | Enhanced PWM Current−Mode Controller for High−Power Universal Off−Line Supplies |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, SOIC-8 |
| 文件頁數： | 14/18頁 |
| 文件大小： | 249K |
| 代理商： | NCP1217D100R2G |
NCP1217, NCP1217A
http://onsemi.com
14
Figure 27. A Negative Spike Takes Place on the Bulk Capacitor at the SwitchOff Sequence
Vcc 5 V/DIV
Vlatch 1 V/DIV
Time 10 ms/DIV
Simple and inexpensive cures exist to prevent from
internal parasitic SCR activation. One of them consists in
inserting a resistor in series with the highvoltage pin to
keep the negative current to the lowest when the bulk
becomes negative (Figure 28). Please note that the negative
spike is clamped to (2*Vf) thanks to the diode bridge. Also,
the power dissipation of this resistor is extremely small since
it only heats up during the startup sequence.
Another option (Figure 29) consists in wiring a diode
from V
CC
to the bulk capacitor to force V
CC
to reach
VCC
ON
sooner and thus stops the switching activity before
the bulk capacitor gets deeply discharged. For security
reasons, two diodes can be connected in series.
Figure 28. A simple resistor in series avoids any
latchup in the controller . . .
Figure 29. . . . or one diode forces V
CC
to reach
VCC
ON
sooner.
8
7
6
5
1
2
3
4
+
Cbulk
Rbulk
4.7 k
+
CV
CC
1
3
2
8
7
6
5
1
2
3
4
+
Cbulk
+
D3
1N4007
CV
CC
1
3
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1217D100R2G | 制造商:ON Semiconductor 功能描述:Pulse Width Modulation (PWM) Controller |
| NCP1217D133R2 | 功能描述:電流型 PWM 控制器 Enhanced Current RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1217D133R2G | 功能描述:電流型 PWM 控制器 Enhanced Current Mode PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1217D133R2G-CUT TAPE | 制造商:ON 功能描述:NCP1217 Series 16 V 146 kHz Enhanced PWM Current-Mode Controller - SOIC-8 |
| NCP1217D65 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Enhanced PWM Current--Mode Controller for High--Power Universal Off--Line Supplies |
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