VIPER20A-E datasheet(21/34 Pages) STMICROELECTRONICS

Il numero della parte	VIPER20A-E

Spiegazioni elettronici	SMPS primary I.C.

PDF	34 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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VIPer20A-E

Electrical over stress

21/34

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

Bulk capacitor

(Optional)

22nF

Auxilliary winding

13V

OSC

COMP SOURCE

DRAIN

VDD

VIPerXX0

39R

VIPER20A-E Scheda tecnica(PDF) 21 Page - STMicroelectronics