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參數(shù)資料
| 型號： | NCP1217P65 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)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, 71.5 kHz SWITCHING FREQ-MAX, PDIP7 |
| 封裝： | PLASTIC, DIP-8/7 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 206K |
| 代理商： | NCP1217P65 |
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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1217P65G | 功能描述:電流型 PWM 控制器 Enhanced Current Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1218 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Controller with Adjustable Skip Level and External Latch Input |
| NCP1218AD65R2G | 功能描述:電流型 PWM 控制器 ANA PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1219 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Controller with Adjustable Skip Level and External Latch Input |
| NCP1219AD100R2G | 功能描述:電流型 PWM 控制器 ANA PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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