onsemi introduces the NCP1680, a highly efficient power factor correction (PFC) controller IC specifically designed for driving bridgeless totem-pole PFC topologies. This advanced controller, part of the critical conduction mode (CRM) family, offers numerous benefits for power supply applications.
The NCP1680, developed by onsemi, adopts a unique PFC architecture with two legs. The first leg operates at the PWM switching frequency, ensuring fast switching. The second leg functions at the AC line frequency. By eliminating the diode bridge commonly present in conventional PFC circuits, this configuration significantly enhances power stage efficiency, resulting in improved overall power supply performance.
With its bridgeless, totem-pole CRM design, the NCP1680 enables power supplies to achieve higher efficiency levels while minimizing power losses. It serves as an ideal choice for various applications, including AC-DC power supplies, LED lighting, electric vehicle chargers, and server power systems.
By utilizing the onsemi NCP1680, designers benefit from superior power factor correction, reduced total harmonic distortion (THD), simplified component count, and increased power supply reliability. The IC incorporates advanced features and protection mechanisms to ensure stable and efficient power supply operation.
Overall, onsemi's NCP1680 bridgeless, totem-pole CRM PFC controller IC provides manufacturers with a reliable and efficient solution for power supply designs, delivering improved performance and energy savings across a wide range of applications.
Totem-pole PFC topology eliminates the input diode bridge
Enables high efficiency and a compact design
CRM operation
Optimized performance
Discontinuous conduction mode (DCM) with valley turn on under light-load conditions
Prevents operation in the audible range
Skip mode in very light-load conditions
Complies with energy-efficiency regulatory standards
Frequency foldback in DCM with 25 kHz minimum frequency
Proprietary current sense scheme
Cycle-by-cycle current limit without a Hall effect sensor
Digital voltage loop compensation
Simplifies design and reduces external components
AC line monitoring circuit and AC phase detection
Near unity power factor in all operating modes
PFC OK indicator
PFC
Offline power supplies
Industrial power supplies
Telecom 5G power
Networking power
Gaming console power supplies
UHD TV power supplies
Computing power supplies
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