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VIPER17HD Scheda tecnica(PDF) 26 Page - STMicroelectronics

Il numero della parte VIPER17HD
Spiegazioni elettronici  Off-line high voltage converters
PDF  33 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER17HD Scheda tecnica(HTML) 26 Page - STMicroelectronics

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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
BRhyst
L
L
BRhyst
BRhyst
INoff
INon
H
I
V
R
R
I
V
V
V
R
+
×
−
−
=



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