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| 型号： | NCP1200D100R2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM 8SOIC |
| 产品变化通告： | Product Obsolescence 11/Feb/2009 |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 86kHz ~ 116kHz |
| 输入电压： | 11 V ~ 16 V |
| 工作温度： | -25°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： | NCP1200D100R2OSCT |
NCP1200
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. Please
refer to AND8069/D for power dissipation calculations.
3
Rbulk
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.
2
> 4.7 k
3
+
Cbulk
1
2
3
4
8
7
6
5
1 +
CV CC
+
Cbulk
1
2
3
4
8
7
6
5
D3
1N4007
1 +
CV CC
Figure 22. A simple resistor in series avoids any
latchup in the controller
A Typical Application
Figure 24 depicts a low ? cost 3.5 W AC ? DC 6.5 V wall
adapter. This is a typical application where the wall ? pack
must deliver a raw DC level to a given internally regulated
Figure 23. or a diode forces V CC to reach
UVLOlow sooner
inherent short ? circuit 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.
apparatus: toys, calculators, CD players etc. Due to the
http://onsemi.com
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1200D100R2G | 功能描述:电流型 PWM 控制器 100KHz 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 |
| NCP1200D100R2G | 制造商:ON Semiconductor 功能描述:Pulse Width Modulation (PWM) Controller |
| NCP1200D40R2 | 功能描述:电流型 PWM 控制器 40KHz 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 |
| NCP1200D40R2G | 功能描述:电流型 PWM 控制器 40KHz 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 |
| NCP1200D60R2 | 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 |
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