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VIPER38 データシート(PDF) 19 Page - STMicroelectronics

部品番号 VIPER38
部品情報  VIPerPlus family: peak power high-voltage converter
PDF  31 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER38 データシート(HTML) 19 Page - STMicroelectronics

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DocID025703 Rev 2
19/31
VIPER38
Operation
31
Where:
•
VOVP is the OVP threshold (see Table 8: Controller section)
•
VOUT OVP is the converter output voltage value to activate the OVP set by the designer
•
NAUX is the number of the auxiliary winding turns
•
NSEC is the number of the secondary winding turns
•
VDSEC is the secondary diode forward voltage
•
VDAUX is the auxiliary diode forward voltage
•
ROVP together with RLIM constitute the output voltage divider
Then, fixing RLIM according to the desired IDlim, the ROVP can be calculated by:
Equation 4
The resistor values will be such that the current sourced and sunk by the CONT pin are
within the rated capability of the internal clamp.
Figure 21. OVP timing diagram
R
OVP
R
LIM
1k
OVP
–
k
OVP
-----------------------
×
=



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