参数资料
型号: NCP1236AD100R2G
厂商: ON Semiconductor
文件页数: 15/34页
文件大小: 0K
描述: IC CTLR CURR MODE 100KHZ 7-SOIC
标准包装: 1
输出隔离: 隔离
频率范围: 92kHz ~ 108kHz
输入电压: 10.5 V ~ 28 V
输出电压: 28V
工作温度: -40°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)7 引线
供应商设备封装: 7-SOIC
包装: 标准包装
其它名称: NCP1236AD100R2GOSDKR
NCP1236
DETAILED DESCRIPTION
High ? Voltage Current Source with Built ? in Brown ? out
Detection
The NCP1236 HV pin can be connected either to the
rectified bulk voltage, or to the ac line through a rectifier.
Start ? up
HV
I start
Control
IC Start
TSD
VCC
+
+
+
?
V CC(on)
?
+
V CC(min)
R
Q
S
+
?
+
blanking
t UVLO(blank)
UVLO
V CC(off )
+
?
+
Reset
V CC(reset)
Figure 30. HV Start ? up Current Source Functional Schematic
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) .
Even though the DSS 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 DSS 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.
If the voltage increases above the overvoltage protection
threshold V CC(ovp) , the controller is latched off.
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