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VIPER50ASP-E Datasheet(PDF) 21 Page - STMicroelectronics

Part No. VIPER50ASP-E
Description  SMPS PRIMARY I.C.
Download  31 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER50ASP-E Datasheet(HTML) 21 Page - STMicroelectronics

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VIPer50A-E/ASP-E
6 Electrical Over Stress
21/31
6
Electrical Over Stress
6.1
Electrical Over Stress Ruggedness
The VIPer may be submitted to electrical over-stress, caused by violent input voltage surges or
lightning. Following the Layout Considerations is sufficient to prevent catastrophic damages
most of the time. However in some cases, the voltage surges coupled through the transformer
auxiliary winding can exceed the VDD pin absolute maximum rating voltage value. Such events
may trigger the VDD internal protection circuitry which could be damaged by the strong
discharge current of the VDD bulk capacitor. The simple RC filter shown in Figure 23 can be
implemented to improve the application immunity to such surges.
Figure 23. Input Voltage Surges Protection
C1
Bulk capacitor
D1
R1
(Optional)
C2
22nF
Auxilliary winding
13V
OSC
COMP SOURCE
DRAIN
VDD
-
+
VIPerXX0
R2
39R


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