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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 (pcs) | Application | 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 (%) | Operating Temperature | 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 | 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 691210910002 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-TBL Series 2109 - 2.54 mm Horiz. Entry | 2 | Rising Cage Clamp | PCB | No | 30 to 18 (AWG) 0.2 to 0.75 (mm²) | – | – | -40 °C up to +105 °C | – | – | – | – | – | – | Box | – | – | -40 °C up to +105 °C | 2.54 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Horizontal | 6 | – | – | – | – | 5.48 | – | – | THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |
 | 691236510002 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-TBL Series 2365 - 5.08 mm Horiz. Entry w. Rising Cage Clamp | 2 | Rising Cage Clamp | PCB | Yes | 12 to 30 (AWG) 3.31 to 0.0509 (mm²) | – | – | -30 °C up to +120 °C | – | – | – | – | – | – | Box | – | – | -30 °C up to +120 °C | 5.08 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Horizontal | 20 | – | – | – | – | 10.16 | – | – | THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |
| 691236510003 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-TBL Series 2365 - 5.08 mm Horiz. Entry w. Rising Cage Clamp | 3 | Rising Cage Clamp | PCB | Yes | 12 to 30 (AWG) 3.31 to 0.0509 (mm²) | – | – | -30 °C up to +120 °C | – | – | – | – | – | – | Box | – | – | -30 °C up to +120 °C | 5.08 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Horizontal | 20 | – | – | – | – | 15.24 | – | – | THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |
 | 7448251201 | SPEC | 11 files | Active i| Production is active. Expected lifetime: >10 years. | WE-CMB Common Mode Power Line Choke | 4 | – | – | – | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | – | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 9 | – | 12 | 1 | 250 | 1500 | MnZn | 31 | 22 | 35 | THT | – | – | – | – | – | – | 40042670 | – | – | – | – | – | – | – | – | 12 | – | – | – | – | XL | – | ||
 | 742792011 | SPEC | 10 files | Active i| Production is active. Expected lifetime: >10 years. | WE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | -55 °C up to +125 °C | – | – | – | – | – | 0.5 | – | – | – | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | 10 | 20 | 1000 MHz | 3000 | 25 | High Current | 2 | – | – | – | – | 2 | 1.2 | 0.9 | SMT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 3 | – | – | – | – | 0805 | – | ||
 | 74270033 | SPEC | 2 files | Active i| Production is active. Expected lifetime: >10 years. | WE-AFB | – | – | – | – | – | – | – | -25 °C up to +125 °C | – | – | – | – | – | – | – | – | – | -25 °C up to +125 °C | – | – | – | – | – | – | – | – | 4.4 | 9.5 | 4.75 | 47 | 68 | – | – | – | – | – | – | – | – | – | – | 3 W 800 | 9.5 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 820443211E | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-VD Disk Varistor | – | 230 VAC | – | – | – | – | – | -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | -40 °C up to +85 °C | – | – | – | – | – | – | 16.5 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 16.5 | 4.8 | 20.5 | THT | 320 | 418 | 510 | 6000 | 190 | 0.6 | Yes | – | – | – | – | – | – | – | – | – | – | – | – | – | 14 mm | – | ||
 | 890334025027CS | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-FTXX Film Capacitors | – | Across the mains | – | – | – | 220 nF | ±10% | -40 °C up to +105 °C | X2 | – | – | 30 GΩ | – | – | Carton | 180 | 0.1 | -40 °C up to +105 °C | 15 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 310 | – | – | 18 | 6 | 11.5 | Boxed THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Pitch 15 mm | – | ||
| 890334026034CS | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-FTXX Film Capacitors | – | Across the mains | – | – | – | 2.2 µF | ±10% | -40 °C up to +105 °C | X2 | – | – | 4.55 GΩ | – | – | Carton | 170 | 0.1 | -40 °C up to +105 °C | 22.5 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 310 | – | – | 26 | 15 | 25 | Boxed THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Pitch 22.5 mm | – | ||
| 890334027025CS | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-FTXX Film Capacitors | – | Across the mains | – | – | – | 3.3 µF | ±10% | -40 °C up to +105 °C | X2 | – | – | 3.03 GΩ | – | – | Carton | 130 | 0.1 | -40 °C up to +105 °C | 27.5 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 310 | – | – | 31 | 15.5 | 29 | Boxed THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Pitch 27.5 mm | – | ||
 | 7447076 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FI Leaded Toroidal Line Choke | – | – | – | – | – | – | – | -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 45 | – | 6.1 | 0.15 | – | – | – | 27.5 | 13.6 | – | THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |
 | 744150 | SPEC | – | 10 files | Active i| Production is active. Expected lifetime: >10 years. | WE-SI Leaded Toroidal Storage Choke | – | – | – | – | – | – | – | -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | 1.2 | 4 | 25 | – | – | – | 28.5 | – | – | – | – | – | – | – | – | – | – | 15 | – | 10.3 | 0.026 | – | – | – | 28.5 | 14.5 | 12 | THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |
 | 760871135 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-UOST Universal Offline Standard Transformers | – | – | – | – | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | – | – | – | – | -40 °C up to +125 °C | – | 0.8 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1.25 | – | 4200 | – | 25.81 | 16.6 | 13.5 | SMT | – | – | – | – | – | – | – | 85 - 265 V (AC) | 12 | 0.55 | 12 | 0.55 | 14 | 60-150 | 136 : 13 : 13 : 15 | – | 2920 | 92 | 92 | 400 | EE16/8/5 | 53 | |
 | 860021375011 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-ATG5 Aluminum Electrolytic Capacitors | – | – | – | – | – | 10 µF | ±20% | – | – | – | 15 | – | – | – | Ammopack | – | – | -25 °C up to +105 °C | 5 | – | – | 2000 | 104 | 120 | 10 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 400 | – | – | 14 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 860130473003 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-ATET Aluminum Electrolytic Capacitors | – | – | – | – | – | 47 µF | ±20% | – | – | – | 13 | – | – | – | Ammopack | – | – | -40 °C up to +125 °C | 2.5 | – | – | 1000 | 110 | 11.75 | 6.3 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 25 | – | – | 11 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 860080780026 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-ATLI Aluminum Electrolytic Capacitors | – | – | – | – | – | 680 µF | ±20% | – | – | – | 8 | – | – | – | Ammopack | – | – | -55 °C up to +105 °C | 7.5 | – | – | 5000 | 2600 | 428.4 | 16 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 63 | – | – | 31.5 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 860040774002 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-ATUL Aluminum Electrolytic Capacitors | – | – | – | – | – | 47 µF | ±20% | – | – | – | 9 | – | – | – | Ammopack | – | – | -40 °C up to +105 °C | 3.5 | – | – | 7000 | 360 | 29.61 | 8 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 63 | – | – | 11.5 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 870025574005 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-PTG5 Aluminum Polymer Capacitors | – | – | – | – | – | 100 µF | ±20% | – | – | – | 8 | – | – | – | Ammopack | – | – | -55 °C up to +105 °C | 3.5 | – | – | 2000 | 4500 | 500 | 8 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 25 | – | – | 8 | – | – | Radial THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 870025575009 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-PTG5 Aluminum Polymer Capacitors | – | – | – | – | – | 330 µF | ±20% | – | – | – | 8 | – | – | – | Ammopack | – | – | -55 °C up to +105 °C | 5 | – | – | 2000 | 4900 | 1650 | 10 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 25 | – | – | 12.5 | – | – | Radial THT | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 861141483007 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-AI3H Aluminum Electrolytic Capacitors | – | – | – | – | – | 220 µF | ±20% | -25 °C up to +105 °C | – | – | 20 | – | – | – | Tray | – | – | -25 °C up to +105 °C | 10 | – | – | 3000 | 1000 | 943.93 | 22 | 640 | – | – | – | – | – | – | – | – | – | – | – | – | – | 450 | – | – | 51 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 22.0 x 50.0 | – | ||
 | 8853622110151 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSSA Interference Suppression | – | – | – | – | – | 2.2 nF | ±10% | -55 °C up to +125 °C | X2 | 2500 | 2.5 | 10 GΩ | X7R Class II | 0.5 | 7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 250 | – | – | 4.5 | 3.2 | 2.5 | SMT-Chip | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1812 | – | ||
 | 760800102 | SPEC | – | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-TORPFC Toroidal PFC Chokes | – | – | – | – | – | – | – | -40 °C up to +155 °C | – | – | – | – | – | – | – | – | – | – | – | 10.5 | – | – | – | – | – | – | – | 60 | – | – | – | – | – | – | 20800 | 55 | – | 9.8 | 0.51 | – | 1000 | – | – | – | 54.5 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | T43 | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins (pcs) | Application | 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 (%) | Operating Temperature | 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 | 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 |
|---|
