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NCP1937 - Combination Power Factor Correction and Quasi- Resonant Flyback Controllers

Datasheet Summary

Features

  • necessary for building a robust and compact PFC stage while minimizing the number of external components. The quasi.
  • resonant current.
  • mode flyback stage features a proprietary valley.
  • lockout circuitry, ensuring stable valley switching. This system works down to the 4th valley and toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while.

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Datasheet Details

Part number NCP1937
Manufacturer ON Semiconductor
File Size 1.16 MB
Description Combination Power Factor Correction and Quasi- Resonant Flyback Controllers
Datasheet download datasheet NCP1937 Datasheet
Additional preview pages of the NCP1937 datasheet.

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Full PDF Text Transcription

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DATA SHEET www.onsemi.com Combination Power Factor Correction and QuasiResonant Flyback Controllers for Adapters NCP1937 This combination IC integrates power factor correction (PFC) and quasi−resonant flyback functionality necessary to implement a compact and highly efficient Switched Mode Power Supply for an adapter application. The PFC stage exhibits near−unity power factor while operating in a Critical Conduction Mode (CrM) with a maximum frequency clamp. The circuit incorporates all the features necessary for building a robust and compact PFC stage while minimizing the number of external components. The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circuitry, ensuring stable valley switching.
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