参数资料
型号: NCP1288BD65R2G
厂商: ON Semiconductor
文件页数: 18/39页
文件大小: 0K
描述: IC REG CTRLR FLYBACK PWM 7SOIC
标准包装: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 70kHz
占空比: 85%
电源电压: 10.5 V ~ 28 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)7 引线
包装: 标准包装
其它名称: NCP1288BD65R2GOSDKR
NCP1288
At startup, 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) . It turns on again when V CC reaches
V CC(min) . This sequence repeats until the input voltage is
high enough to ensure a proper startup, i.e. when V HV
reaches V HV(start) . The switching actually starts the next
time V CC reaches V CC(on) , as shown in Figure 5. The current
source is then turned off, saving additional power when the
V CC is supplied externally.
Once the controller has started, if V CC reaches V CC(min)
the switching stops and the protection mode is activated: the
controller must be supplied by an external voltage source.
V HV
V HV(start)
Waits
next
V CC(on)
before
V HV(min)
V CC
V CC(on)
V CC(min)
HV
starting
time
V CC(inhibit)
current
source =
I start1
HV
current
source =
I start2
time
DRV
Figure 42. Startup Timing Diagram
http://onsemi.com
18
time
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