OVP count

GD

OVP triggered

and IC disabled

OVP check and

IC re-enabled

ovp_eoc

OVP check and

IC disabled

An input overvoltage protection can be easily realized connecting the rectified mains to OVP pin through a voltage

divider, as shown in Figure 33. Connection for input overvoltage protection (iso/non-iso topologies).

In case of non-isolated topologies, with the same principle an output overvoltage protection can be implemented,

as shown in Figure 34. Connection for output overvoltage protection (non-iso topologies).

If the OVP feature is not required, OVP pin must be connected to GND, which excludes the function.

If the OVP feature is required, RH value can be set arbitrarily, but some Mohms at least are recommended in

overvoltage threshold, the value of RL can be calculated from the following formula:

Equation 4

(4)

Vin/out_OVP

VOVP_tℎ −1

The power consumption of the OVP network at given Vin is expressed as:

Equation 5

(5)

in case of connection for input overvoltage protection and

Equation 6

(6)

RH+RL

in case of connection for output overvoltage protection.

VIPER31

Overvoltage protection

DS13285 - Rev 3

page 22/40