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NCP1612A - High-Efficiency Power Factor Controller

Features

  • necessary for robust and compact PFC stages, with few external components. General Features.
  • Near-unity Power Factor.
  • Critical Conduction Mode (CrM).
  • Current Controlled Frequency Fold-back (CCFF): Low Frequency Operation is Forced at Low Current Levels.
  • On-time Modulation to Maintain a Proper Current Shaping in CCFF Mode.
  • Skip Mode Near the Line Zero Crossing.
  • Fast Line/Load Transient Compensation (Dynamic Response Enhancer).
  • Valley.

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Datasheet Details

Part number NCP1612A
Manufacturer onsemi
File Size 1.46 MB
Description High-Efficiency Power Factor Controller
Datasheet download datasheet NCP1612A Datasheet

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Full PDF Text Transcription

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DATA SHEET www.onsemi.com Enhanced, High‐Efficiency Power Factor Controller NCP1612A, NCP1612B, NCP1612A1, NCP1612A2, NCP1612A3, NCP1612B2 The NCP1612 is designed to drive PFC boost stages based on an innovative Current Controlled Frequency Fold-back (CCFF) method. In this mode, the circuit classically operates in Critical conduction Mode (CrM) when the inductor current exceeds a programmable value. When the current is below this preset level, the NCP1612 linearly decays the frequency down to about 20 kHz when the current is null. CCFF maximizes the efficiency at both nominal and light load. In particular, the stand-by losses are reduced to a minimum. Like in FCCrM controllers, an internal circuitry allows near-unity power factor even when the switching frequency is reduced.
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