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参数资料
| 型号： | NCP1203P40G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM UVLO HV 8DIP |
| 标准包装： | 50 |
| 系列： | SMARTMOS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 37kHz ~ 47kHz |
| 输入电压： | 8.4 V ~ 16 V |
| 输出电压： | 500V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 其它名称： | NCP1203P40GOS |
NCP1203
Figure 21. 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 22). Please note that the negative
spike is clamped to –2 x Vf due to the diode bridge. Also, the
power dissipation of this resistor is extremely small since it
only heats up during the startup sequence.
Rbulk
> 4.7 k
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.
+
Cbulk
1
2
3
4
8
7
6
5
+
CV CC
+
Cbulk
1
2
3
4
8
7
6
5
D3
1N4007
+
CV CC
Figure 22. A simple resistor in series avoids any
latchup in the controller
Figure 23. or a diode forces V CC to reach
UVLOlow sooner
http://onsemi.com
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1203P60 | 功能描述:电流型 PWM 控制器 60KHz Current Mode 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 |
| NCP1203P60G | 功能描述:电流型 PWM 控制器 60KHz Current Mode SMPS 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 |
| NCP1205 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| NCP1205/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| NCP1205_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
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