VIPER17HN datasheet(26/33 Pages) STMICROELECTRONICS

Part #	VIPER17HN

Description	Off-line high voltage converters

PDF	33 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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26 / 33 page

Operation descriptions

VIPER17

26/33

Equation 10

For a proper operation of this function, VIN on must be less than the peak voltage at

minimum mains and VIN off less than the minimum voltage on the input bulk capacitor at

minimum mains and maximum load.

The BR pin is a high impedance input connected to high value resistors, thus it is prone to

pick up noise, which might alter the OFF threshold when the converter operates or gives

origin to undesired switch-off of the device during ESD tests.

It is possible to bypass the pin to ground with a small film capacitor (e.g. 1-10 nF) to prevent

any malfunctioning of this kind.

If the Brown-out function is not used the pin has to be connected to GND.

BRhyst

INoff

INon

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VIPER17HN Datasheet(PDF) 26 Page - STMicroelectronics