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Overview
| Topology | Power Factor Correction |
| Input voltage | 95-245 V |
| Output 1 | 375 V / 3 A |
| IC revision | 1 |
Description
1kW Totem-Pole PFC for Telecom Applications - Stand-by card and MainboardThe NCP1681 is a PFC controller IC designed to drive the bridgeless totem-pole PFC topology. The bridgeless totem-pole PFC is a power factor correction architecture that consists of a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in the power stage efficiency. The controller can be configured to operate in Continuous Conduction Mode (CCM) or Multi-Mode (CrM-CCM) operation.
Features
Totem Pole PFC Topology Eliminates Input Diode BridgeContinuous Conduction Mode (CCM) Operation At High Power LevelOptional Multi-mode Operation With CCM at High Power & CrM at Medium Power LevelFrequency Foldback in DCM With 25 kHz Minimum FrequencySkip Mode in Very Light Load ConditionNovel Current Sense SchemeDigital Voltage Loop CompensationAC Line Monitoring Circuit & AC Phase DetectionNear Unity Power Factor in All Operating ModesPFC OK Indicator
Typical applications
- PFC, Telecom, Server
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins | PCB/Cable/Panel | Modularity | Wire Section | C | Tol. C | Operating Temperature | Safety Class | VIMP(V (DC)) | DF(%) | RISO | Ceramic Type | Fl(mm) | Packaging | dV/dt(V/µs) | DF @ 1 kHz(%) | Pitch(mm) | ISAT(A) | fres(MHz) | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Ø D(mm) | RESR(mΩ) | Ø Cable max.(mm) | Ø OD(mm) | Ø ID(mm) | Z @ 25 MHz 1 turn(Ω) | Z @ 100 MHz 1 turn(Ω) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(mΩ) | Type | IR(A) | L(mH) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | VRMS(V) | VDC(V) | VBR(V) | IPeak(A) | Wmax(J) | PDiss(W) | VDE Approval | VIN(V) | VOut1(V) | IOut1(A) | VOut2(V) | IOut2(A) | Vaux(V) | fswitch | n | IR(A) | RDC 1(mΩ) | RDC 2(mΩ) | RDC 3(mΩ) | RDC 4(mΩ) | Size | LS(µH) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-TBL Series 2109 - 2.54 mm Horiz. Entry, 2, Rising Cage Clamp | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 2109 - 2.54 mm Horiz. Entry | Pins2 | PCB/Cable/PanelPCB | ModularityNo | Wire Section 30 to 18 (AWG) 0.2 to 0.75 (mm²) | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | PackagingBox | – | – | Pitch2.54 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeHorizontal | Rated Current6 A | – | – | – | – | Length5.48 mm | – | – | MountTHT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WR-TBL Series 2365 - 5.08 mm Horiz. Entry w. Rising Cage Clamp, 2, Rising Cage Clamp | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Pins2 | PCB/Cable/PanelPCB | ModularityYes | Wire Section 12 to 30 (AWG) 3.31 to 0.0509 (mm²) | – | – | Operating Temperature -30 °C up to +120 °C | – | – | – | – | – | – | PackagingBox | – | – | Pitch5.08 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeHorizontal | Rated Current20 A | – | – | – | – | Length10.16 mm | – | – | MountTHT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
| WR-TBL Series 2365 - 5.08 mm Horiz. Entry w. Rising Cage Clamp, 3, Rising Cage Clamp | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Pins3 | PCB/Cable/PanelPCB | ModularityYes | Wire Section 12 to 30 (AWG) 3.31 to 0.0509 (mm²) | – | – | Operating Temperature -30 °C up to +120 °C | – | – | – | – | – | – | PackagingBox | – | – | Pitch5.08 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeHorizontal | Rated Current20 A | – | – | – | – | Length15.24 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | DC Resistance9 mΩ | – | Rated Current12 A | Inductance1 mH | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length31 mm | Width22 mm | Height35 mm | MountTHT | – | – | – | – | – | – | VDE Approval40042670 | – | – | – | – | – | – | – | – | Rated Current12 A | – | – | – | – | SizeXL | – | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | Pad Dimension0.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Impedance @ 100 MHz10 Ω | Maximum Impedance20 Ω | Maximum Impedance1000 MHz | Rated Current 23000 mA | DC Resistance25 mΩ | TypeHigh Current | Rated Current2 A | – | – | – | – | Length2 mm | Width1.2 mm | Height0.9 mm | MountSMT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Current3 A | – | – | – | – | Size0805 | – | ||||
 | WE-AFB, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-AFB | – | – | – | – | – | – | Operating Temperature -25 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Cable Diameter Max.4.4 mm | Outer Diameter9.5 mm | Inner Diameter4.75 mm | Impedance @ 25 MHz 1 turn47 Ω | Impedance @ 100 MHz 1 turn68 Ω | – | – | – | – | – | – | – | – | – | – | Material3 W 800 | Length9.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WE-VD Disk Varistor, –, 230 VAC | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-VD Disk Varistor | – | – | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Diameter16.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Length16.5 mm | Width4.8 mm | Height20.5 mm | MountTHT | AC Operating Voltage320 V | DC Operating Voltage418 V | (Reverse) Breakdown Voltage510 V | (Reverse) Peak Pulse Current6000 A | Energy Absorption190 J | Power Dissipation0.6 W | VDE ApprovalYes | – | – | – | – | – | – | – | – | – | – | – | – | – | Size14 mm | – | ||||
 | WCAP-FTXX Film Capacitors, –, Across the mains | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTXX Film Capacitors | – | – | – | – | Capacitance220 nF | Capacitance±10% | Operating Temperature -40 °C up to +105 °C | Safety ClassX2 | – | – | Insulation Resistance30 GΩ | – | – | PackagingCarton | Rate of Voltage Rise180 V/µs | Dissipation Factor0.1 % | Pitch15 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage310 V (AC) | – | – | Length18 mm | Width6 mm | Height11.5 mm | MountBoxed THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | SizePitch 15 mm | – | ||||
| WCAP-FTXX Film Capacitors, –, Across the mains | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTXX Film Capacitors | – | – | – | – | Capacitance2.2 µF | Capacitance±10% | Operating Temperature -40 °C up to +105 °C | Safety ClassX2 | – | – | Insulation Resistance4.55 GΩ | – | – | PackagingCarton | Rate of Voltage Rise170 V/µs | Dissipation Factor0.1 % | Pitch22.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage310 V (AC) | – | – | Length26 mm | Width15 mm | Height25 mm | MountBoxed THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | SizePitch 22.5 mm | – | ||||
| WCAP-FTXX Film Capacitors, –, Across the mains | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTXX Film Capacitors | – | – | – | – | Capacitance3.3 µF | Capacitance±10% | Operating Temperature -40 °C up to +105 °C | Safety ClassX2 | – | – | Insulation Resistance3.03 GΩ | – | – | PackagingCarton | Rate of Voltage Rise130 V/µs | Dissipation Factor0.1 % | Pitch27.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage310 V (AC) | – | – | Length31 mm | Width15.5 mm | Height29 mm | MountBoxed THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | SizePitch 27.5 mm | – | ||||
 | WE-FI Leaded Toroidal Line Choke, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FI Leaded Toroidal Line Choke | – | – | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | DC Resistance45 mΩ | – | Rated Current6.1 A | Inductance0.15 mH | – | – | – | Length27.5 mm | Width13.6 mm | – | MountTHT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WE-SI Leaded Toroidal Storage Choke, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SI Leaded Toroidal Storage Choke | – | – | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | Pitch1.2 mm | Saturation Current4 A | Self Resonant Frequency25 MHz | – | – | – | Diameter28.5 mm | – | – | – | – | – | – | – | – | – | – | DC Resistance15 mΩ | – | Rated Current10.3 A | Inductance0.026 mH | – | – | – | Length28.5 mm | Width14.5 mm | Height12 mm | MountTHT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WE-UOST Universal Offline Standard Transformers, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-UOST Universal Offline Standard Transformers | – | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | Saturation Current0.8 A | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Inductance1.25 mH | – | Insulation Test Voltage4200 V (AC) | – | Length25.81 mm | Width16.6 mm | Height13.5 mm | MountSMT | – | – | – | – | – | – | – | Input Voltage 85 - 265 V (AC) | Output Voltage 112 V | Output Current 10.55 A | Output Voltage 212 V | Output Current 20.55 A | Auxiliary Voltage14 V | Switching Frequency60-150 | Turns Ratio136 : 13 : 13 : 15 | – | DC Resistance 12920 mΩ | DC Resistance 292 mΩ | DC Resistance 392 mΩ | DC Resistance 4400 mΩ | SizeEE16/8/5 | Leakage Inductance53 µH | |||
 | WCAP-ATG5 Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG5 Aluminum Electrolytic Capacitors | – | – | – | – | Capacitance10 µF | Capacitance±20% | – | – | – | Dissipation Factor15 % | – | – | – | PackagingAmmopack | – | – | Pitch5 mm | – | – | Endurance 2000 | Ripple Current104 mA | Leakage Current120 µA | Diameter10 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage400 V (AC) | – | – | Length14 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WCAP-ATET Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATET Aluminum Electrolytic Capacitors | – | – | – | – | Capacitance47 µF | Capacitance±20% | – | – | – | Dissipation Factor13 % | – | – | – | PackagingAmmopack | – | – | Pitch2.5 mm | – | – | Endurance 1000 | Ripple Current110 mA | Leakage Current11.75 µA | Diameter6.3 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length11 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WCAP-ATLI Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATLI Aluminum Electrolytic Capacitors | – | – | – | – | Capacitance680 µF | Capacitance±20% | – | – | – | Dissipation Factor8 % | – | – | – | PackagingAmmopack | – | – | Pitch7.5 mm | – | – | Endurance 5000 | Ripple Current2600 mA | Leakage Current428.4 µA | Diameter16 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage63 V (AC) | – | – | Length31.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WCAP-ATUL Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATUL Aluminum Electrolytic Capacitors | – | – | – | – | Capacitance47 µF | Capacitance±20% | – | – | – | Dissipation Factor9 % | – | – | – | PackagingAmmopack | – | – | Pitch3.5 mm | – | – | Endurance 7000 | Ripple Current360 mA | Leakage Current29.61 µA | Diameter8 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage63 V (AC) | – | – | Length11.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WCAP-PTG5 Aluminum Polymer Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-PTG5 Aluminum Polymer Capacitors | – | – | – | – | Capacitance100 µF | Capacitance±20% | – | – | – | Dissipation Factor8 % | – | – | – | PackagingAmmopack | – | – | Pitch3.5 mm | – | – | Endurance 2000 | Ripple Current4500 mA | Leakage Current500 µA | Diameter8 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length8 mm | – | – | MountRadial THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
| WCAP-PTG5 Aluminum Polymer Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-PTG5 Aluminum Polymer Capacitors | – | – | – | – | Capacitance330 µF | Capacitance±20% | – | – | – | Dissipation Factor8 % | – | – | – | PackagingAmmopack | – | – | Pitch5 mm | – | – | Endurance 2000 | Ripple Current4900 mA | Leakage Current1650 µA | Diameter10 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length12.5 mm | – | – | MountRadial THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AI3H Aluminum Electrolytic Capacitors | – | – | – | – | Capacitance220 µF | Capacitance±20% | Operating Temperature -25 °C up to +105 °C | – | – | Dissipation Factor20 % | – | – | – | PackagingTray | – | – | Pitch10 mm | – | – | Endurance 3000 | Ripple Current1000 mA | Leakage Current943.93 µA | Diameter22 mm | ESR640 mΩ | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage450 V (AC) | – | – | Length51 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Size22.0 x 50.0 | – | |||||
 | WCAP-CSSA Interference Suppression, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSSA Interference Suppression | – | – | – | – | Capacitance2.2 nF | Capacitance±10% | Operating Temperature -55 °C up to +125 °C | Safety ClassX2 | Impulse Voltage2500 V (DC) | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage250 V (AC) | – | – | Length4.5 mm | Width3.2 mm | Height2.5 mm | MountSMT-Chip | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Size1812 | – | ||||
 | WE-TORPFC Toroidal PFC Chokes, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TORPFC Toroidal PFC Chokes | – | – | – | – | – | – | Operating Temperature -40 °C up to +155 °C | – | – | – | – | – | – | – | – | – | – | Saturation Current10.5 A | – | – | – | – | – | – | – | Outer Diameter60 mm | – | – | – | – | – | – | Rated Current 220800 mA | DC Resistance55 mΩ | – | Rated Current9.8 A | Inductance0.51 mH | – | Insulation Test Voltage1000 V (AC) | – | – | – | Height54.5 mm | – | – | – | – | – | – | – | – | Input Voltage 700 - 85 | – | – | – | – | – | – | – | – | – | – | – | – | SizeT43 | – |