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VIPER35 数据表(PDF) 30 Page - STMicroelectronics

部件名 VIPER35
功能描述  Quasi-resonant high performance off line high voltage converter
PDF  44 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

VIPER35 数据表(HTML) 30 Page - STMicroelectronics

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Operation description
VIPer35
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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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