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onsemi NCP1618 Multimode Power Factor Correction IC

onsemi NCP1618 Multimode Power Factor Correction (PFC) IC is a high voltage controller with transitions from one operation mode to another. This IC circuit can enter the soft-SKIP mode for minimized losses in very light-load conditions. The NCP1618 PFC IC is housed in a SO-9 package. This IC circuit incorporates the features necessary for robust and compact PFC stages with few external components. Applications include PC power supplies and all off-line appliances requiring power factor correction.

Features

  • High-voltage start-up current source for VCC capacitor charge at startup
  • Internal compensation of the regulation loop
  • Fast line/load transient compensation (dynamic response enhancer)
  • 9.5V to 35V VCC operating range
  • Line range detection
  • pfcOK signal for enabling/disabling the downstream converter
  • Jittering for easing EMI filtering
  • Multimode operation
    • Multimode operation for optimized operation over the line/load range
      • Continuous conduction mode (CCM) in heavy-load condition
      • Frequency-clamped critical conduction mode (FCCrM) in medium- and light-load condition
    • Near-unity power factor in all modes (except soft-SKIP mode)
    • Firm control of the switching frequency between 25kHz and 130kHz range
  • Safety features
    • Soft- and fast-overvoltage protection
    • Line-sag and brown-out detection
    • Two-level overcurrent detection
    • Bulk undervoltage detection
    • Redundant overvoltage protection using the ZCD pin (OVP2)
    • Thermal shutdown
    • Latched off capability

Applications

  • PC power supplies
  • Off-line appliances requiring power factor correction

Application Schematic

Schematic - onsemi NCP1618 Multimode Power Factor Correction IC

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Published: 2020-12-15 | Updated: 2025-03-04