Overview
The NCP1605DR2G, produced by onsemi, is a high-performance power factor controller designed to achieve near-unity power factor in fixed frequency, Discontinuous Conduction Mode (DCM) or Critical Conduction Mode (CRM) operations. This controller is housed in a SOIC-16 package and integrates all necessary features for building robust and compact Power Factor Correction (PFC) stages with minimal external components. It is particularly suited for applications requiring high efficiency and low standby losses.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Range | 10 | - | 20 | V |
| VCC Turn-On Threshold | 14 (NCP1605), 10.5 (NCP1605A) | - | 15 (NCP1605), 11.5 (NCP1605A) | V |
| Switching Frequency | - | - | 250 | kHz |
| Gate Drive Capability | -500 | - | +800 | mA |
| Thermal Shutdown Threshold | - | - | 155 | °C |
| Overcurrent Protection Threshold | 230 | 250 | 265 | mA |
| Package Type | - | - | SOIC-16 | - |
Key Features
- Near-unity power factor in fixed frequency DCM or CRM operations
- Lossless high voltage current source for startup
- Soft skip cycle for low power standby mode
- Synchronization capability
- Fast line/load transient compensation
- Valley turn-on capability
- High drive capability: -500 mA / +800 mA
- Signal to indicate PFC readiness (pfcOK pin)
- Output under and overvoltage protection
- Brown-out detection and soft-start for smooth startup operation
- Overcurrent limitation and zero current detection
- Thermal shutdown and latched off capability
Applications
- PC power supplies
- All offline appliances requiring power factor correction
Q & A
- What is the primary function of the NCP1605DR2G?
The NCP1605DR2G is a power factor controller designed to achieve near-unity power factor in fixed frequency, Discontinuous Conduction Mode (DCM) or Critical Conduction Mode (CRM) operations.
- What is the operating voltage range of the NCP1605DR2G?
The operating voltage range is from 10 V to 20 V.
- What is the maximum switching frequency of the NCP1605DR2G?
The maximum switching frequency is up to 250 kHz.
- What are the key safety features of the NCP1605DR2G?
The key safety features include output under and overvoltage protection, brown-out detection, soft-start, overcurrent limitation, zero current detection, and thermal shutdown.
- How does the NCP1605DR2G handle standby mode?
The NCP1605DR2G has a soft skip cycle capability to lower standby losses to a minimum.
- What is the purpose of the pfcOK pin?
The pfcOK pin indicates that the PFC stage is ready for operation.
- What are the typical applications of the NCP1605DR2G?
Typical applications include PC power supplies and all offline appliances requiring power factor correction.
- What is the package type of the NCP1605DR2G?
The package type is SOIC-16.
- How does the NCP1605DR2G handle thermal shutdown?
The device has a thermal shutdown threshold of 155°C with a hysteresis of 15°C.
- Is the NCP1605DR2G RoHS compliant?
Yes, the NCP1605DR2G is Pb-free, halogen-free/BFR-free, and RoHS compliant.
