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VIPER012XSTR Datasheet(PDF) 25 Page - STMicroelectronics

Part # VIPER012XSTR
Description  Energy saving off-line high voltage converter
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER012XSTR Datasheet(HTML) 25 Page - STMicroelectronics

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VIPer01
General description
DocID028751 Rev 1
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4.15
Thermal shutdown
If the junction temperature becomes higher than the internal threshold TSD (160 °C, typ.),
the PWM is disabled. After tRESTART time, a single switching cycle is performed, during
which the temperature sensor embedded in the power MOSFET section is checked. If a
junction temperature above TSD is still measured, the PWM is maintained disabled for
tRESTART time, otherwise it resumes switching with soft-start phase.
During tRESTART VCC is maintained between VCSon and VCCon levels by the HV current source
periodical activation. Such a behavior is summarized in below figure:
Figure 32: Thermal shutdown timing diagram



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