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VIPER35 Datasheet(PDF) 31 Page - STMicroelectronics

Part # VIPER35
Description  Quasi-resonant high performance off line high voltage converter
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER35 Datasheet(HTML) 31 Page - STMicroelectronics

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DocID026980 Rev 4
31/44
VIPer35
Operation description
44
Figure 38. Timing diagram: OVP
8.12
ZCD pin summary
With reference to Figure 37, the circuitry connected to the ZCD pin enables the following
functions:
1.
Current limit set-point (IDLIM)
2.
Line feed-forward compensation (FF)
3.
Output overvoltage protection (OVP)
4.
Zero-current detection for QR operation
Chosen RLIM, RFF and ROVP as described in the previous sections, these functions are
automatically defined.
Table 7 refers to Figure 37 and lists the external resistance combinations needed to activate
one or more functions associated to ZCD pin.



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