While the design of power supplies emphasizes efficiency and compactness, the significance of Power Factor Correction (PFC) is steadily growing. PFC plays a vital role in limiting the effects of power supply functioning on the AC mains system, mitigating both harmonic content along power lines and losses stemming from reactive power. Nevertheless, the creation of a power supply that excels in efficiency and occupies minimal space, while also incorporating PFC, presents a formidable challenge. This article from onsemi demonstrates the potential of altering a conventional PFC topology to successfully accomplish this objective.
| Product | WPN | Description |
|---|---|---|
| Power Factor Controllers | FAN9673 | Continuous Conduction mode (CCM) Power Factor Controller, Interleaved Three-Channel |
| NCP1612 | Critical Conduction Mode (CrM) Power Factor Controller | |
| NCP1680 | Totem Pole Critical Conduction Mode (CrM) Power Factor Correction Controller | |
| NCP1681 | Totem Pole Continuous Conduction Mode (CCM) / Multimode (CrM-CCM) Power Factor Correction Controller | |
| NCP4390 | Continuous Conduction mode (CCM) Power Factor Controller, Interleaved Three-Channel | |
| NCP13992 | Current Mode Resonant Controller with Integrated High Voltage Drivers | |
| NCP1342 | Quasi-Resonant Flyback Controller with Valley Lock-Out Switching | |
| NCP1568 | AC-DC Active Clamp Flyback PWM Controller | |
| NCP4318 | Dual Channel Synchronous Rectification Controller | |
| Regulator | NCP10670/1/2 | 700V High-Voltage Switcher for low Power offline SMPS |
| NCP11187 | Enhanced standby mode, 800 V Switcher | |
| NCP10672 | Highly Integrated Dual-Mode Active Clamp PWM Controller | |
| LDO | NCP164 | 300mA LDO Regulator, Ultra-Low Noise, High PSRR with Power Good |
| NCP189 | LDO, 500mA, Low noise, High Accuracy with Power-Good amd VoutControlled slew rate | |
| NCP716 | LDO Regulator, 80 mA, Ultra-Low Iq | |
| NCP731 | LDO Regulator, 150 mA, 38 V, 8 µVrms Low Noise, with Enable and external Soft Start | |
| Protection | NIS4461 | Electronic fuse (eFuse), 24V, 44mΩ, 4.2A |
| NIS5420 | Electronic fuse (eFuse), 12V, 44 mΩ, 4A, ISENSE | |
| NIS6420 | Electronic Fuse, 12V | |
| 1N47 | Zener diode, 1W 5% |
NCP1680/1 - Totem Pole Critical Conduction Mode (CRM) / Multi-mode (CrM-CCM) Power Factor Correction Controllers
The NCP1680 and NCP1681 are PFC controllers 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 NCP1681 controller can be configured to operate in Continuous Conduction Mode (CCM) or Multi-Mode (CrM-CCM) operation.
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