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參數(shù)資料
| 型號： | NCP1200 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| 中文描述： | PWM電流模式控制器的低功耗通用離線用品 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 151K |
| 代理商： | NCP1200 |
NCP1200
http://onsemi.com
11
Figure 21. A negative spike takes place on the Bulk capacitor at the switchoff sequence
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 22). Please note that the negative
spike is clamped to –2 x Vf due to the diode bridge. Please
refer to AND8069/D for power dissipation calculations.
Another option (Figure 23) consists in wiring a diode from
V
CC
to the bulk capacitor to force V
CC
to reach UVLOlow
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 22. A simple resistor in series avoids any
latchup in the controller
CV
CC
D3
1N4007
8
7
6
5
1
2
3
4
+
Cbulk
+
1
3
CV
CC
Rbulk
> 4.7 k
8
7
6
5
1
2
3
4
+
Cbulk
+
1
2
3
Figure 23. or a diode forces V
CC
to reach
UVLOlow sooner
A Typical Application
Figure 24 depicts a lowcost 3.5 W ACDC 6.5 V wall
adapter. This is a typical application where the wallpack
must deliver a raw DC level to a given internally regulated
apparatus: toys, calculators, CD players etc. Due to the
inherent shortcircuit protection of the NCP1200, you only
need a bunch of components around the IC, keeping the final
cost at an extremely low level. The transformer is available
from different suppliers as detailed on the following page.
相關PDF資料 |
PDF描述 |
|---|---|
| NCP1200D100R2 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200D100R2G | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200D40R2 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200P40 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200P40G | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1200/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current−Mode Controller for Low−Power Universal Off−Line Supplies |
| NCP1200_09 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200A/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
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