Hybrid Flyback ICs

概要

Infineon's innovative approach to asymetrical half bridge controller topology - Hybrid flyback controller for ultra-high power density designs

Hybrid flyback controllers combine the simplicity of a flyback with the performance of resonant mode. Hybrid flyback controllers are able to drive both high-and low-side switches in an asymmetric half-bridge flyback topology. Thanks to this innovative approach, ultra-high power density designs with very low standby power consumption is achieved.

Key features

  • 600 V high voltage start-up cell
  • Burst mode for lowest standby power
  • HFB ZVS operation
  • HFB peak current control
  • Harmonized PFC and hybrid flyback  
  • Integrated gate drivers for Si/GaN 
  • Enhanced jitter for EMI reduction

Infineon's XDP™ digital power XDPS22xx family supports the innovative hybrid flyback topology. This topology, also known as the asymmetrical half-bridge flyback converter, merges the features of flyback and forward converters. It addresses the main problems related to high-density adapters operating at moderate switching frequencies. The hybrid topology can ensure zero-voltage switching (ZVS) and zero-current switching (ZCS) over line and load. It lays the foundation for the highest conversion efficiency by using the magnetization current to achieve ZVS on the primary-side half-bridge and ZCS on the synchronous rectification switch. The parasitic leakage inductance is an integral part of the converter.

Unlike other topologies, hybrid flyback transformers do not need to store all the energy, thus reducing the charger’s size. Hybrid flyback can achieve full ZVS operation on the primary side, and full ZCS operation on the secondary side, and the leakage energy is recycled, thereby achieving high efficiency. The duty-cycle directly influences the output voltage, offering a solution to the limitations of the LLC topology in applications requiring a wide range of output voltage output.

Infineon offers various controllers to meet your design needs. Latest generation of hybrid flyback controller ICs family, E-series Hybrid Flyback controllers offers:

  • XDP™ XDPS2201E: DC-DC hybrid flyback controller
  • XDP™ XDPS2221E: AC-DC PFC + hybrid flyback combo controller

Key features of E-series hybrid flyback controller ICs include:

  • Integrated gate drivers: both XDPS2201E and XDPS2221E supports GaN and Si switches, providing flexibility in choosing power components based on performance and cost objectives.
  • High-voltage start-up cell: Features a 600 V high-voltage start-up cell for fast VCC charging, essential for quick power-up sequences and maintaining efficiency under variable load conditions.
  • Burst-mode operation control: This feature is crucial for achieving the lowest no-load standby power, a critical factor in enhancing energy efficiency across operational conditions.
  • Ease of design: E-series hybrid flyback controller family comes with design tool to foster the design in progress.
  • For XDPS2221 combo controller, adaptive PFC and hybrid-flyback control: The controller adapts the PFC bus voltage according to operating conditions, which is vital for optimizing efficiency during average and light-load operations.

Hybrid flyback controller ICs can be used in many SMPS applications.

E-series hybrid flyback controller ICs are optimized for USB-PD and non-USB-PD chargers in compliance with the latest energy saving and efficiency standards from CoC and DoE. Proven compatibility with inbox and aftermarket chargers, notebook adapters, cordless power tool and eBike chargers, LED drivers and ultra high density PSU solutions as TV.

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