Overview
The NCP1632DR2G, produced by onsemi, is an interleaved, 2-phase Power Factor Controller (PFC) designed for high-efficiency power factor correction in various applications. This integrated circuit integrates a dual MOSFET driver, enabling interleaved PFC stages that offer several advantages, including ease of implementation, use of smaller components, and better heat distribution. The NCP1632 operates in critical conduction mode (CrM) during heavy load conditions and in discontinuous conduction mode (DCM) with frequency foldback during light load conditions, optimizing efficiency across the entire power range.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 10 | - | 20 | V |
| Startup Threshold Voltage | 11 | 12 | 13 | V |
| Operating Temperature Range | -40 | - | 125 | °C |
| Gate Drive Current Capability | -500 | - | +800 | mA |
| Zero Current Detection Threshold Voltage | 0.40 | 0.50 | 0.60 | V |
| Thermal Shutdown Threshold | 130 | 140 | 150 | °C |
| Package Type | - | - | SOIC-16 | - |
Key Features
- Near-unity power factor
- 180° phase shift in all conditions, including transient phases
- Frequency clamped critical conduction mode (FCCrM) for efficient operation
- Frequency fold-back at low power for improved light load efficiency
- Accurate zero current detection by auxiliary winding for valley turn-on
- Fast line and load transient compensation
- High drive capability: -500 mA / +800 mA
- pfcOK pin to indicate PFC stage readiness
- Safety features: output over and under voltage protection, brown-out detection, soft-start, over current limitation, and inrush current detection
Applications
- Computer power supplies
- LCD / Plasma flat panels
- All offline appliances requiring power factor correction
Q & A
- What is the primary function of the NCP1632DR2G?
The NCP1632DR2G is an interleaved, 2-phase Power Factor Controller designed for high-efficiency power factor correction.
- What are the operating voltage and temperature ranges for the NCP1632DR2G?
The operating voltage range is from 10 V to 20 V, and the operating temperature range is from -40°C to 125°C.
- What is the significance of the 180° phase shift in the NCP1632DR2G?
The 180° phase shift reduces current ripple and improves overall system efficiency and stability.
- How does the NCP1632DR2G handle light load conditions?
The NCP1632DR2G uses frequency fold-back and skip-cycle capability to optimize efficiency during light load conditions.
- What safety features are included in the NCP1632DR2G?
The device includes output over and under voltage protection, brown-out detection, soft-start, over current limitation, and inrush current detection.
- What is the purpose of the pfcOK pin?
The pfcOK pin indicates that the PFC stage is ready for operation.
- How does the NCP1632DR2G handle line and load transients?
The device incorporates fast line and load transient compensation to prevent large output voltage variations.
- What is the typical application of the NCP1632DR2G in computer power supplies?
The NCP1632DR2G is used to achieve high-efficiency power factor correction, reducing current ripple and improving overall system efficiency.
- Can the NCP1632DR2G be used in LCD/Plasma flat panels?
- What package type is the NCP1632DR2G available in?
The NCP1632DR2G is available in a SOIC-16 package.
