Overview
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.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Operating Temperature | °C | -55 | - | 150 |
| Operating Voltage | V DC | 10 | - | 20 |
| Gate Drive Current Capability | mA | - | 500-800 | - |
| Rise Time (DRV1, DRV2) | ns | - | 40 | - |
| Fall Time (DRV1, DRV2) | ns | - | 40 | - |
| Package | - | - | SOIC-16 | - |
| Mounting Style | - | - | SMD/SMT | - |
Key Features
- 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.
Applications
- 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.
Q & A
- What is the operating temperature range of the NCP1631DR2G?
The operating temperature range is from -55°C to 150°C.
- What is the typical package type for the NCP1631DR2G?
The NCP1631DR2G is housed in a SOIC-16 package.
- What are the key operating modes of the NCP1631DR2G?
The controller operates in Frequency Clamped Critical Conduction Mode (FCCrM) and Discontinuous Conduction Mode (DCM).
- 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.
- 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.
- 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.
- What is the typical gate drive current capability of the NCP1631DR2G?
The gate drive current capability is typically 500-800 mA.
- 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.
- 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).
- 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).
