Digital PFC + Half-bridge/LLC Combo IC
XDP™ digital multi-mode PFC & half-bridge/LLC combo controllers
The XDP™ digital power devices are high performance digital combo controllers with integrated drivers and 600V depletion cell, designed for boost PFC and half-bridge/LLC targeting switched-mode power supplies (SMPS) from 75W to 300W.
The advanced control algorithm of XDP™ provides boost PFC with multi-mode operation, including critical conduction mode (CrCM), quasi-resonant discontinuous mode (QR DCM), and active burst mode. In addition, the seamless communication between PFC and half-bridge/LLC ensures optimal system operation and consequently greatly improves system reliability.
Resonant-mode power supplies are a variation of SMPS circuits offering advantages such as high efficiency, low EMI, and high power density. By applying ZCS (zero-current) and ZVS (zero-voltage) switching schemes, switching losses are reduced significantly. Consequently, these resonant converters are also known as soft-switching controllers. Non-resonant mode SMPS circuits rely on hard-switching techniques. As such, Infineon offers 2 types of resonant-mode controller ICs, namely hybrid flyback (or commonly known as asymmetric half-bridge flyback topology), and LLC controllers.
Both types of resonant controllers share similarities such as utilizing an external capacitor as well as leakage inductance from the main transformer to form a resonant tank to aid its switching operation. Although both types of converters look similar at first glance, distinct differences exist to best fit each targeted application.
Hybrid flyback controllers combine the simplicity of a flyback with the performance of resonant mode. By utilizing two high-voltage MOSFETs such as CoolMOS™, hybrid flyback controllers are able to drive both high-and low-side MOSFET in an asymmetric half-bridge flyback topology. To reduce switching losses, ZVS and ZCS are achieved through the means of regulating both positive and negative magnetizing current. In addition, transformer leakage energy is recycled thereby further reduces switching losses.
|Single diode or SR MOSFET||Dual diode or SR MOSFET|
|Breakdown voltage of
|>= 100 V||>= 40 V for 12 V output voltage|
|Recommended power range||< 300 W||> 150 W|
|Recommended design||Single output with variable Vout||Single or multiple output with fixed Vout|
|Target application||USB-PD charger||SMPS for audio, TV, PC, Server and industrial power supply|