参数资料
型号: NCP1237AD65R2G
厂商: ON Semiconductor
文件页数: 19/41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: 9.5 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: NCP1237AD65R2GOSDKR
NCP1237
To reduce the power dissipation in case the V CC pin is
shorted to GND (in case of V CC capacitor failure, or external
pulldown on V CC to disable the controller), the startup
current is lowered when V CC is below V CC(inhibit) .
There are only two conditions for which the current source
doesn’t turn on when V CC reaches V CC(min) : the voltage on
HV pin is too low (below V HV(min) ), or a thermal shutdown
condition (TSD) has been detected. In all other conditions,
the HV current source always turns on and off to maintain
V CC between V CC(min) and V CC(on) .
HV stop
Brown-out
or AC OVP
detected
Brown ? out and Line Overvoltage
When the input voltage goes below V HV(stop) , a
brown ? out condition is detected, and the controller stops.
The HV current source alternatively turns on and off to
maintain V CC between V CC(on) and V CC(min) until the input
voltage is back above V HV(start) .
The same situation occurs when an overvoltage is
detected on the ac line, i.e. when the input voltage goes
above V HV(OV) : the controller stops, and resumes normal
operation when the overvoltage condition has gone.
Waits next
time
V CC
V CC(on) before
starting
V CC(on)
V CC(min)
time
DRV
Figure 45. Brown ? out or Line Overvoltage Timing Diagram
http://onsemi.com
19
time
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