VIPER17_0810 STMICROELECTRONICS [STMicroelectronics], VIPER17_0810 Datasheet - Page 26

• Manufacturer Part Number: VIPER17_0810
• Description: Off-line high voltage converters
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Operation descriptions
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Equation 10
For a proper operation of this function, V
minimum mains and V
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.
R
IN off
H
=
V
less than the minimum voltage on the input bulk capacitor at
INon
−
V
I
BRhyst
INoff
IN on
−
V
BRhyst
must be less than the peak voltage at
×
R
L
+
R
V
I
BRhyst
BRhyst
L
VIPER17