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NCP1237 Datasheet(PDF) 10 Page - ON Semiconductor

Part # NCP1237
Description  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  34 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1237 Datasheet(HTML) 10 Page - ON Semiconductor

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NCP1237
http://onsemi.com
10
DETAILED DESCRIPTION
High−Voltage Current Source (Dynamic Self−Supply)
with Built−in Brown−out Detection
The NCP1237 HV pin can be connected either to the
rectified bulk voltage, or to the ac line through a rectifier.
Startup
−
+
−
+
+
+
R
S
Q
TSD
HV
VCC
Istart
VCC(on)
VCC(off )
tUVLO(blank)
blanking
Control
UVLO
−
+
+
VCC(reset)
Reset
IC Start
−
+
+
VCC(min)
Figure 4. HV Startup Current Source Functional Schematic



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