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参数资料
| 型号： | NCP1217D100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM CM OVP HV 8SOIC |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 110kHz |
| 输入电压： | 8.3 V ~ 16 V |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1217D100R2GOSCT |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1217D100R2G | 制造商:ON Semiconductor 功能描述:Pulse Width Modulation (PWM) Controller |
| NCP1217D133R2 | 功能描述:电流型 PWM 控制器 Enhanced Current RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1217D133R2G | 功能描述:电流型 PWM 控制器 Enhanced Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体: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 制造商全称:ON Semiconductor 功能描述:Enhanced PWM Current--Mode Controller for High--Power Universal Off--Line Supplies |
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