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参数资料
| 型号： | NCP1605FORWGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP1605FORWG |
| 设计资源： | NCP1605FORWGEVB BOM NCP1605FORWGEVB Gerber Files NCP1605 EVB Schematic |
| 标准包装： | 1 |
| 主要目的： | AC/DC，主面和辅面，带 PFC |
| 输出及类型： | 1，隔离 |
| 输出电压： | 19V |
| 电流 - 输出： | 8A |
| 输入电压： | 90 ~ 265VAC |
| 稳压器拓扑结构： | 正向转换器 |
| 频率 - 开关： | 133kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1217，NCP1605 |
| 其它名称： | NCP1605FORWGEVBOS |
NCP1217, NCP1217A
Vcc 5 V/DIV
Vlatch 1 V/DIV
Time 10 ms/DIV
Figure 27. A Negative Spike Takes Place on the Bulk Capacitor at the Switch--Off 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 high--voltage 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.
3
Rbulk
> 4.7 k
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.
+
Cbulk
1
2
8
7
2
+
Cbulk
1
2
8
7
3
D3
1N4007
3
6
1
3
6
1
4
5
+
CV CC
4
5
+
CV CC
Figure 28. A simple resistor in series avoids any
latch--up in the controller . . .
Figure 29. . . . or one diode forces V CC to reach
VCC ON sooner.
http://onsemi.com
15
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