| Topology | Power Factor Correction |
| Input voltage | 95-245 V |
| Output 1 | 375 V / 3 A |
| IC revision | 1 |
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.
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
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) | SamplesAvailability & Sample | ||
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![]() | SPECWR-TBL Series 2109 - 2.54 mm Horiz. Entry, 2, Rising Cage Clamp | Simulation– | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||
![]() | SPECWR-TBL Series 2365 - 5.08 mm Horiz. Entry w. Rising Cage Clamp, 2, Rising Cage Clamp | Simulation– | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||
![]() | SPECWR-TBL Series 2365 - 5.08 mm Horiz. Entry w. Rising Cage Clamp, 3, Rising Cage Clamp | Simulation– | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||
![]() | SPECWE-CMB Common Mode Power Line Choke, 4, – | Availability – | 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 | – | –Check availability | |||
![]() | SPECWE-CBF SMT EMI Suppression Ferrite Bead, –, – | Availability – | 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 | – | –Check availability | |||
![]() | SPECWE-AFB, –, – | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | |||
![]() | SPECWE-VD Disk Varistor, –, 230 VAC | Availability – | 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 | – | –Check availability | |||
![]() | SPECWCAP-FTXX Film Capacitors, –, Across the mains PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | Availability – | 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 | – | –Check availability | |||
![]() | SPECWCAP-FTXX Film Capacitors, –, Across the mains | Availability – | 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 | – | –Check availability | |||
![]() | SPECWCAP-FTXX Film Capacitors, –, Across the mains | Availability – | 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 | – | –Check availability | |||
![]() | SPECWE-FI Leaded Toroidal Line Choke, –, – | Simulation– | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||
![]() | SPECWE-SI Leaded Toroidal Storage Choke, –, – | Simulation– | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | ||
![]() | SPECWE-UOST Universal Offline Standard Transformers, –, – | Simulation– | Availability – | 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 | –Check availability | ||
![]() | SPECWCAP-ATG5 Aluminum Electrolytic Capacitors, –, – | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | |||
![]() | SPECWCAP-ATET Aluminum Electrolytic Capacitors, –, – | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | |||
![]() | SPECWCAP-ATLI Aluminum Electrolytic Capacitors, –, – | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | |||
![]() | SPECWCAP-ATUL Aluminum Electrolytic Capacitors, –, – | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | |||
![]() | SPECWCAP-PTG5 Aluminum Polymer Capacitors, –, – | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | |||
![]() | SPECWCAP-PTG5 Aluminum Polymer Capacitors, –, – | Availability – | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | –Check availability | |||
![]() | SPECWCAP-AI3H Aluminum Electrolytic Capacitors, –, – | Availability – | 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 Current1160 mA | Leakage Current945 µA | Diameter22 mm | ESR1210 mΩ | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage450 V (AC) | – | – | Length50 mm | – | – | MountSnap-In | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Size22.0 x 50.0 | – | –Check availability | |||
![]() | SPECWCAP-CSSA Interference Suppression, –, – | Availability – | 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 | – | –Check availability | |||
![]() | SPECWE-TORPFC Toroidal PFC Chokes, –, – | Simulation– | Availability – | 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 | – | –Check availability |
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |