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| 型号： | NCP1246AD065R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 18/39页 |
| 文件大小： | 0K |
| 描述： | IC CTLR CURR MODE 65KHZ 8SOIC |
| 标准包装： | 2,500 |
| 系列： | * |
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NCP1246
The information about the fault (permanent Latch or
Autorecovery) is kept during the low consumption off mode
due the safety reason. The reason is not to allow unlatch the
device by the remote control being in off mode.
Start ? up of the Controller
At start ? up, the current source turns on when the voltage
on the HV pin is higher than V HV(min) , and turns off when
V CC reaches V CC(on) , then turns on again when V CC reaches
V CC(min) , until the input voltage is high enough to ensure a
proper start ? up, i.e. when V HV reaches V HV(start) . The
controller actually starts the next time V CC reaches V CC(on) .
The controller then delivers pulses, starting with a soft ? start
period t SSTART during which the peak current linearly
increases before the current ? mode control takes over.
V HV
V HV(start)
V HV(min)
Even though the Dynamic Self ? Supply is able to maintain
the V CC voltage between V CC(on) and V CC(min) by turning
the HV start ? up current source on and off, it can only be used
in light load condition, otherwise the power dissipation on
the die would be too much. As a result, an auxiliary voltage
source is needed to supply V CC during normal operation.
The Dynamic Self ? Supply is useful to keep the controller
alive when no switching pulses are delivered, e.g. in
brown ? out condition, or to prevent the controller from
stopping during load transients when the V CC might drop.
The NCP1246 accepts a supply voltage as high as 28 V, with
an overvoltage threshold V CC(ovp) that latches the controller
off.
Waits next V CC(on)
before starting
time
V CC
V CC(on)
V CC(min)
HV current
source = I start1
HV current
source = I start2
V CC(inhibit)
time
DRV
Figure 48. V CC Start ? up Timing Diagram
http://onsemi.com
18
time
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1246AD100R2G | 功能描述:电流型 PWM 控制器 FIXED FREQ (100KHZ) CURRE 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 |
| 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 |
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