onsemi NCP1631DR2G

The NCP1631DR2G, produced by ON Semiconductor, is an interleaved, 2-phase Power Factor Controller (PFC) designed for high-efficiency power factor correction applications. This integrated circuit is housed in a SOIC-16 package and is optimized for use in systems requiring cost-effectiveness, reliability, low standby power, and high power factor. The NCP1631 integrates a dual MOSFET driver for interleaved PFC stages, operating in Frequency Clamped Critical Conduction Mode (FCCrM) and Discontinuous Conduction Mode (DCM), ensuring efficient operation across various load conditions.

• Near-Unity Power Factor: The NCP1631 ensures high power factor correction, making it suitable for applications requiring efficient power management.
• Interleaved Operation: The controller operates in a 180° phase shift between the two branches, reducing current ripple and improving overall efficiency.
• Frequency Clamped Critical Conduction Mode (FCCrM): The NCP1631 operates in FCCrM, transitioning seamlessly between Critical Conduction Mode (CrM) and Discontinuous Conduction Mode (DCM) without degradation of the current shape.
• Protection Features: Includes over-voltage protection (OVP), under-voltage protection (UVP), maximum current limit, in-rush detection, brown-out detection, and thermal shutdown.
• Low Standby Power: The circuit is designed to reduce power consumption in no-load conditions, enhancing overall system efficiency.
• Fast Line/Load Transient Compensation: The controller includes dynamic response enhancers to speed up the regulation loop during load or line transients.
• pfcOK Signal: Indicates when the PFC stage is in steady state, allowing the downstream converter to operate optimally.

• Offline Appliances: Suitable for all offline appliances requiring power factor correction.
• LCD/Plasma Flat Panels: Ideal for use in display technologies that demand high power factor and efficiency.
• General Power Supplies: Can be used in various power supply applications where high efficiency and reliability are crucial.

1. What is the operating temperature range of the NCP1631DR2G?

   The operating temperature range is from -55°C to 150°C.

2. What is the typical package type for the NCP1631DR2G?

   The NCP1631DR2G is housed in a SOIC-16 package.

3. What are the key operating modes of the NCP1631DR2G?

   The controller operates in Frequency Clamped Critical Conduction Mode (FCCrM) and Discontinuous Conduction Mode (DCM).

4. What protection features are included in the NCP1631DR2G?

   The controller includes OVP, UVP, maximum current limit, in-rush detection, brown-out detection, and thermal shutdown.

5. How does the NCP1631DR2G handle line and load transients?

   The controller includes dynamic response enhancers to speed up the regulation loop during load or line transients.

6. What is the purpose of the pfcOK signal in the NCP1631DR2G?

   The pfcOK signal indicates when the PFC stage is in steady state, allowing the downstream converter to operate optimally.

7. What is the typical gate drive current capability of the NCP1631DR2G?

   The gate drive current capability is typically 500-800 mA.

8. How does the NCP1631DR2G reduce power consumption in no-load conditions?

   The circuit is designed to skip cycles when the error amplifier reaches its low clamp level, reducing power consumption in no-load conditions.

9. What is the significance of the 180° phase shift in the NCP1631DR2G?

   The 180° phase shift between the two branches reduces current ripple and improves overall efficiency).

10. What types of applications are the NCP1631DR2G suitable for?

    Suitable for offline appliances, LCD/plasma flat panels, and general power supplies requiring high power factor correction).