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Overview
| Topology | Other Topology |
| IC revision | 6 |
Description
The NCP1631 integrates a dual MOSFET driver for interleaved PFC applications. Interleaving consists of paralleling two small stages in lieu of a bigger one, more difficult to design. This approach has several merits like the ease of implementation, the use of smaller components or a better distribution of the heating. Also, Interleaving extends the power range of Critical Conduction Mode that is an efficient and cost−effective technique (no need for low trr diodes). In addition, the NCP1631 drivers are 180° phase shift for a significantly reduced current ripple. Housed in a SOIC16 package, the circuit incorporates all the features necessary for building robust and compact interleaved PFC stages, with a minimum of external components.
Features
- Near−Unity Power Factor
- Substantial 180° Phase Shift in All Conditions Including TransientPhases
- Frequency Clamped Critical Conduction Mode (FCCrM) i.e.,Fixed Frequency, Discontinuous Conduction Mode Operation withCritical Conduction Achievable in Most Stressful Conditions
- FCCrM Operation Optimizes the PFC Stage Efficiency Over theLoad Range
- Out−of−phase Control for Low EMI and a Reduced rms Current inthe Bulk Capacitor
- Frequency Fold−back at Low Power to Further Improve the LightLoad Efficiency
- Accurate Zero Current Detection by Auxiliary Winding for ValleyTurn On
- Fast Line / Load Transient Compensation
- High Drive Capability: −500 mA / +800 mA
- Signal to Indicate that the PFC is Ready for Operation (“pfcOK”Pin)
- VCC Range: from 10 V to 20 VSafety Features
- Output Over and Under Voltage Protection
- Brown−Out Detection with a 50−ms Delay to Help Meet Hold−up Time Specifications
- Soft−Start for Smooth Start−up Operation
- Programmable Adjustment of the Maximum Power
- Over Current Limitation
- Detection of Inrush Currents
Typical applications
- LCD / Plasma Flat Panels
- All Off Line Appliances Requiring Power Factor
- Computer Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | IR(A) | L(mH) | RDC max.(mΩ) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-CMB Common Mode Power Line Choke, 4 A, 3.3 mH | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | Rated Current4 A | Inductance3.3 mH | DC Resistance35 mΩ | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length27.5 mm | Width18.5 mm | Height33 mm | MountTHT | ||||
750817340 | Offline Transformer WE-UNIT, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer WE-UNIT | – | – | – | – | – | – | – | – | – | – | ||
750311887 | Gate Drive Transformer WE-GDT, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Gate Drive Transformer WE-GDT | – | – | – | – | – | – | – | – | – | – |