Overview
The NCP1655ADR2G from onsemi is an innovative multimode power factor controller designed for compact and robust power factor correction (PFC) stages. This controller optimizes efficiency over a wide range of line and load conditions by naturally transitioning between different operation modes. It supports Continuous Conduction Mode (CCM), Frequency-Clamped Critical Conduction Mode (FCCrM), and Discontinuous Conduction Mode (DCM), as well as a soft-SKIP mode for very light load conditions. The device is housed in a SO-9 package and requires few external components, making it ideal for applications requiring high efficiency and minimal component count.
Key Specifications
| Parameter | Typical Value | Minimum Value | Maximum Value |
|---|---|---|---|
| Switching Frequency (CCM) | 65 kHz | - | - |
| Switching Frequency (FCCrM) | 130 kHz | - | - |
| Minimum DCM Frequency | 30.5 kHz | 25 kHz | 36 kHz |
| VCC Operating Range | - | 9.5 V | 35 V |
| Maximum Junction Temperature | - | - | 150°C |
| Operating Temperature Range | - | -40°C | 125°C |
| Thermal Resistance Junction-to-Air | - | - | 180°C/W |
| Driver Output Current | - | -500 mA | +800 mA |
Key Features
- Multimode operation: CCM, FCCrM, DCM, and soft-SKIP modes for optimized efficiency.
- Near-unity power factor in all modes except soft-SKIP mode.
- Internal compensation of the regulation loop and fast line/load transient compensation (Dynamic Response Enhancer).
- High-voltage line sensing pin with reduced external component count and minimized leakage current.
- pfcOK signal for enabling/disabling the downstream converter.
- Jittering for easing EMI filtering.
- Safety features include soft- and fast-overvoltage protection, brown-out detection, 2-level overcurrent detection, bulk under-voltage detection, and thermal shutdown.
Applications
- PC power supplies.
- All off-line appliances requiring power factor correction.
Q & A
- What is the primary function of the NCP1655ADR2G? The NCP1655ADR2G is a multimode power factor controller designed to optimize power factor correction in various applications.
- What are the different operation modes of the NCP1655ADR2G? The device operates in Continuous Conduction Mode (CCM), Frequency-Clamped Critical Conduction Mode (FCCrM), Discontinuous Conduction Mode (DCM), and soft-SKIP mode.
- What is the typical switching frequency range for the NCP1655ADR2G? The typical switching frequency ranges from 25 kHz to 130 kHz.
- What is the purpose of the pfcOK pin? The pfcOK pin is used to enable or disable the downstream converter and provide a feedforward signal based on the PFC output voltage.
- What safety features are included in the NCP1655ADR2G? The device includes soft- and fast-overvoltage protection, brown-out detection, 2-level overcurrent detection, bulk under-voltage detection, and thermal shutdown.
- What is the maximum junction temperature for the NCP1655ADR2G? The maximum junction temperature is 150°C.
- What is the operating temperature range for the NCP1655ADR2G? The operating temperature range is from -40°C to 125°C.
- How does the NCP1655ADR2G handle EMI filtering? The device includes jittering to ease EMI filtering.
- What is the typical VCC operating range for the NCP1655ADR2G? The VCC operating range is from 9.5 V to 35 V.
- What package type is the NCP1655ADR2G available in? The device is housed in a SO-9 package.
