参数资料
型号: NCP1234AD65R2G
厂商: ON Semiconductor
文件页数: 14/33页
文件大小: 0K
描述: IC REG CTRLR FLYBACK PWM 7SOIC
标准包装: 2,500
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: 带卷 (TR)
NCP1234
DETAILED DESCRIPTION
High ? Voltage Current Source
The NCP1234 HV pin can be connected either to the
rectified bulk voltage, or to the ac line through a rectifier.
Start ? up
HV
However, the overpower compensation will work correctly
only if the HV pin is connected to the bulk voltage.
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 27. 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 V CC is supplied by an internal source. 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 latch condition, or to
prevent the controller from stopping during load transients
when the V CC might drop.
http://onsemi.com
14
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