Datasheet

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VIPer50/SP - VIPer50A/ASP
Figure 22: Input Voltage Surges Protection
ELECTRICAL OVER STRESS RUGGEDNESS
The VIPer may be submitted to electrical over
stress caused by violent input voltage surges or
lightning. Following the enclosed Layout
Considerations chapter rules is the most of the
time sufficient to prevent catastrophic damages,
however in some cases the voltage surges
coupled through the transformer auxiliary winding
can overpass the V
DD
pin absolute maximum
rating voltage value. Such events may trigger the
V
DD
internal protection circuitry which could be
damaged by the strong discharge current of the
V
DD
bulk capacitor. The simple RC filter shown in
figure 22 can be implemented to improve the
application immunity to such surges.
C1
Bulk capacitor
D1
R1
(Optional)
C2
22nF
Auxilliary winding
13V
OSC
COMP SOURCE
DRAIN
VDD
-
+
VIPerXX0
R2
39R