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Overview
| Topology | Power Factor Correction |
| Switching frequency | 27.4 kHz |
| IC revision | 04 |
Description
The 8−pin PFC controller NCL2801 is designed to drive PFC boost stages. It is based on an innovative Valley Count Frequency Fold−back (VCFF) method. The circuit classically operates in Critical conduction Mode (CrM) for high load values. When the load decreases a Discontinuous Conduction Mode DCM is forced by forcing a dead time which, by construction corresponds to a fixed number of valleys. The lower the output power, the higher the number of valleys corresponding to the dead time. After DCM works down to 6th valley switching and if the load continues to decrease, a dead time is continuously added to the 6th valley. The end of additional dead time is synchronized with the drain voltage valley. The maximum switching period is limited to 36.5 s. VCFF maximizes the efficiency during DCM and light load. In particular, the stand−by losses are reduced to a minimum. Like in FCCrM controllers, internal circuitry allows near−unity power factor even when the switching frequency is reduced. Housed in a SO−8 package, the circuit also incorporates the features necessary for robust and compact PFC stages, with few external components.
Features
- Near−Unity Power Factor
- Critical Conduction Mode (CrM)
- Valley Count Frequency Fold−Back (VCFF)
- Peak Current Control Mode to Maintain a Proper Current Shaping in VCFF Mode
- Fast Line / Load Transient Compensation (Dynamic Response Enhancer) Option
- Brown−out Detection
- Two−level Line Feed−Forward (HL&LL)
- Valley Turn−on (No Valley Hoping by Construction)
- High Drive Capability: −500 mA / +800 mA
- VCC Range: from 10.5 V to 27 V
- Low Start−up Consumption for :
- [C]& [D] Option: Low VCC Start−up Level (12.5 V)[A]& [B] Option: High VCC Start−up Level (17.0 V)[E]& [F] Option: High VCC Start−up Level (10.5 V)
- This is a Pb−Free Device
Typical applications
- Lighting Ballasts (LED, Fluorescent), • Flat TV
- PC Power Supplies, All Off Line Appliances Requiring Power Factor Correction
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins | PCB/Cable/Panel | Modularity | Type | Wire Section | C | VR 2(V (DC)) | Safety Class | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | Packaging | Tol. C | Operating Temperature | DF(%) | Ceramic Type | Fl(mm) | fres(MHz) | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Ø D(mm) | IR(A) | L(mH) | RDC max.(mΩ) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | VIN | n | ISAT(A) | RDC1 max(mΩ) | RDC2 max(mΩ) | Size | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-TBL Series 1317 - Rising Cage Clamp 5.00mm pitch - Horizontal cable entry - THT, 2, Pressure Clamp Divisible | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Pins2 | PCB/Cable/PanelPCB | ModularityNo | TypeHorizontal | Wire Section 30 to 12 (AWG) 0.05 to 3.31 (mm²) | – | – | – | – | – | – | Pitch5 mm | PackagingBox | – | Operating Temperature -30 °C up to +120 °C | – | – | – | – | – | – | – | – | Rated Current22 A | – | – | – | – | – | Length10 mm | – | – | MountTHT | – | – | – | – | – | – | |||
| WR-TBL Series 1317 - Rising Cage Clamp 5.00mm pitch - Horizontal cable entry - THT, 3, Pressure Clamp Divisible | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Pins3 | PCB/Cable/PanelPCB | ModularityNo | TypeHorizontal | Wire Section 30 to 12 (AWG) 0.05 to 3.31 (mm²) | – | – | – | – | – | – | Pitch5 mm | PackagingBox | – | Operating Temperature -30 °C up to +120 °C | – | – | – | – | – | – | – | – | Rated Current22 A | – | – | – | – | – | Length15 mm | – | – | MountTHT | – | – | – | – | – | – | |||
 | WE-CMB Common Mode Power Line Choke, 4, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | Pins4 | – | – | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | – | – | – | 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 | – | – | – | – | – | SizeL | ||||
 | WE-PFC PFC Chokes, 4, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PFC PFC Chokes | Pins4 | – | – | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +125 % | – | – | – | – | – | – | – | – | Rated Current3 A | Inductance0.18 mH | – | – | Insulation Test Voltage1500 V (AC) | – | Length48 mm | Width43 mm | Height32 mm | MountTHT | Input Voltage 85 - 265 V (AC) | Turns Ratio9:1 | Saturation Current13.2 A | DC Resistance 178 mΩ | DC Resistance 2200 mΩ | SizeRM14 | ||||
 | WCAP-FTXX Film Capacitors, –, Across the mains | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTXX Film Capacitors | – | – | – | – | – | Capacitance330 nF | Rated Voltage 2630 V (DC) | Safety ClassX2 | Rate of Voltage Rise260 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch12.5 mm | PackagingCarton | Capacitance±10% | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage310 V (AC) | – | – | Length15 mm | Width8.5 mm | Height14 mm | MountBoxed THT | – | – | – | – | – | SizePitch 12.5 mm | ||||
| WCAP-FTXX Film Capacitors, –, Across the mains | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTXX Film Capacitors | – | – | – | – | – | Capacitance220 nF | Rated Voltage 2630 V (DC) | Safety ClassX2 | Rate of Voltage Rise240 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch12.5 mm | PackagingBulk | Capacitance±10% | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage310 V (AC) | – | – | Length15 mm | Width7 mm | Height12.5 mm | MountBoxed THT | – | – | – | – | – | SizePitch 12.5 mm | ||||
 | WE-SI Leaded Toroidal Storage Choke, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SI Leaded Toroidal Storage Choke | – | – | – | – | – | – | – | – | – | – | – | Pitch0.5 mm | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | Self Resonant Frequency1.8 MHz | – | – | – | Diameter23 mm | Rated Current2 A | Inductance0.39 mH | DC Resistance250 mΩ | – | – | – | Length23 mm | Width12.5 mm | Height12 mm | MountTHT | – | – | Saturation Current0.8 A | – | – | – | |||
 | WCAP-ATLI Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATLI Aluminum Electrolytic Capacitors | – | – | – | – | – | Capacitance22 µF | – | – | – | – | – | Pitch2 mm | PackagingAmmopack | Capacitance±20% | – | Dissipation Factor8 % | – | – | – | Endurance 2000 | Ripple Current220 mA | Leakage Current11 µA | Diameter5 mm | – | – | – | Rated Voltage50 V (AC) | – | – | Length11 mm | – | – | – | – | – | – | – | – | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance1 nF | – | – | – | – | Insulation Resistance10 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Ceramic TypeX7R Class II | Pad Dimension0.4 mm | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length1.6 mm | Width0.8 mm | Height0.8 mm | – | – | – | – | – | – | Size0603 | |||||
| WCAP-CSGP MLCCs 25 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 25 V(DC) | – | – | – | – | – | Capacitance330 nF | – | – | – | – | Insulation Resistance1.5 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Operating Temperature -55 °C up to +125 °C | Dissipation Factor3.5 % | Ceramic TypeX7R Class II | Pad Dimension0.6 mm | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length3.2 mm | Width1.6 mm | Height0.95 mm | – | – | – | – | – | – | Size1206 | |||||
| WCAP-CSGP MLCCs 25 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 25 V(DC) | – | – | – | – | – | Capacitance2.2 µF | – | – | – | – | Insulation Resistance0.2 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Operating Temperature -55 °C up to +125 °C | Dissipation Factor3.5 % | Ceramic TypeX7R Class II | Pad Dimension0.6 mm | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length3.2 mm | Width1.6 mm | Height1.6 mm | – | – | – | – | – | – | Size1206 | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance100 nF | – | – | – | – | Insulation Resistance5 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Ceramic TypeX7R Class II | Pad Dimension0.6 mm | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length3.2 mm | Width1.6 mm | Height0.8 mm | – | – | – | – | – | – | Size1206 | |||||
 | WCAP-FTBP Film Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTBP Film Capacitors | – | – | – | – | – | Capacitance150 nF | – | – | Rate of Voltage Rise200 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch15 mm | PackagingCarton | Capacitance±5% | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage630 V (AC) | – | – | Length18 mm | Width7 mm | Height13 mm | – | – | – | – | – | – | SizePitch 15 mm |