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| 型号： | NCP1246AD100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 28/39页 |
| 文件大小： | 0K |
| 描述： | IC CTLR CURR MODE 100KHZ 8SOIC |
| 标准包装： | 2,500 |
| 系列： | * |
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NCP1246
Figure 60. Soft ? Start Feature
Under some conditions, like a winding short ? circuit for
instance, not all the energy stored during the on time is
transferred to the output during the off time, even if the on
time duration is at its minimum (imposed by the propagation
delay of the detector added to the LEB duration). As a result,
the current sense voltage keeps on increasing above V ILIM ,
because the controller is blind during the LEB blanking
time. Dangerously high current can grow in the system if
nothing is done to stop the controller. That’s what the
additional comparator, that senses when the current sense
voltage on CS pin reaches V CS(stop) ( = 1.5 x V ILIM ), does:
as soon as this comparator toggles, the controller
In order to allow the NCP1246 to operate in CCM with a
duty cycle above 50%, the fixed slope compensation is
internally applied to the current ? mode control. The slope
appearing on the internal voltage setpoint for the PWM
comparator is ? 32.5 mV/ m s typical for the 65 kHz version,
and ? 50 mV/ m s for the 100 kHz version. The slope
compensation can be observable as a value of the peak
current at CS pin.
The internal slope compensation circuitry uses a sawtooth
signal synchronized with the internal oscillator is subtracted
from the FB voltage divided by K FB .
immediately enters the protection mode.
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1246B100DR2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters |
| NCP1246B65DR2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters |
| NCP1246BD065R2G | 功能描述:电流型 PWM 控制器 FIXED FREQ (65KHZ) CURREN 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 |
| NCP1246BD100R2G | 功能描述:电流型 PWM 控制器 FIXED FREQ (65KHZ) CURREN 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 |
| NCP1246-D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters |
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