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VIPER35 Datasheet(PDF) 30 Page - STMicroelectronics |
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VIPER35 Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 44 page  Operation description VIPer35 30/44 DocID026980 Rev 4 Equation 5 Equation 6 where: • VOVP is the OVP threshold (see Table 7) • VOUTOVP is the converter output voltage value to activate the OVP (set by design) • NAUX is the auxiliary winding turn • NSEC is the secondary winding turn • VDSEC is the secondary diode forward voltage • VDAUX is the auxiliary diode forward voltage • ROVP and RLIM make the output voltage divider By fixing RLIM, according to the desired IDlim, ROVP can be calculated as follows: Equation 7 The resistor values let the current sourced and sunk by the ZCD pin be within the rated capability of the internal clamp. K OVP V OVP N AUX N SEC -------------- V OUTOVP V DSEC + () V DAUX – ⋅ --------------------------------------------------------------------------------------------------- = K OVP R LIM R LIM R OVP + ---------------------------------- = R OVP R LIM 1K OVP – K OVP ------------------------ × = |
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