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| 型号： | NCP1246AD100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 26/39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
Low Load Operation Modes: Frequency Foldback
Mode (FFM) and Skip Mode
In order to improve the efficiency in light load conditions,
the frequency of the internal oscillator is linearly reduced
from its nominal value down to f OSC(min) . This frequency
foldback starts when the voltage on FB pin goes below
V FB(foldS) , and is complete when V FB reaches V FB(foldE) .
The maximum on ? time duration control is kept during the
frequency foldback mode to provide the natural transformer
core anti ? saturation protection. The frequency jittering is
still active while the oscillator frequency decreases as well.
The current setpoint is fixed to 300 mV in the frequency
foldback mode if the feedback voltage decreases below the
V FB(freeze) level. This feature increases efficiency under the
light loads conditions as well.
Figure 57. Frequency Foldback Mode Characteristic
Figure 58. Current Setpoint Dependency on the Feedback Pin Voltage
When the FB voltage reaches V skip(in) while decreasing,
skip mode is activated: the driver stops, and the internal
consumption of the controller is decreased. While V FB is
below V skip(out) , the controller remains in this state; but as
soon as V FB crosses the skip out threshold, the DRV pin
starts to pulse again.
http://onsemi.com
26
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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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