NCP1288
DETAILED DESCRIPTION
High−Voltage Current Source (Dynamic Self−Supply)
with Built−in Brown−out Detection
The NCP1288 HV pin can be connected either to the
rectified bulk voltage, or to the ac line through a rectifier.
Startup
HV
VCC
Control
Istart
+
+−
VCC(on)
TSD
IC Start
R
Q
S
−
+
+
blanking
tUVLO(blank)
VCC(min)
UVLO
−
++
VCC(reset)
Reset
Figure 4. HV Startup Current Source Functional Schematic
http://onsemi.com
10