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VIPER35 Datasheet(PDF) 30 Page - STMicroelectronics

No. de pieza VIPER35
Descripción Electrónicos  Quasi-resonant high performance off line high voltage converter
PDF  44 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER35 Datasheet(HTML) 30 Page - STMicroelectronics

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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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