ZVS chipset for high efficiency USB-C chargers
Infineon Technologies has launched a secondary-side controlled flyback converter chipset with a noncomplementary active-clamp flyback (NCP-ACF) and quasi-resonant flyback with zero voltage switching (QR-ZVS) topologies for enhanced efficiency.
The EZ-PD PAG2 ZVS chipset developed by Infineon is aimed at high-efficiency USB-C adapters, chargers, and travel adapters.
The chipset includes the EZ-PD PAG2P and EZ-PD PAG2S chips, integrating USB PD, a synchronous rectifier, and a PWM controller. The chipset provides efficient communication and isolation between primary and secondary sides using the CYPET121 pulse-edge transformer (PET).
- Infineon pushes into USB PD chargers with adaptive ZVS
- First PFC and hybrid flyback combo for GaN-based USB-C
The EZ-PD PAG2 family offers PD 3.1 standard power range (SPR) with programmable power supply (PPS) and 28V extended power range (EPR) for fast, reliable charging. It is suitable for a wide range of power levels, and is compatible with BC v1.2, AFC, Apple charging and QC5.0, and its universal AC line input support from 90 to 265 V AC for global usability.
It provides programmable soft-start using an external capacitor, offering controlled power-ups and discontinuous conduction mode (DCM), critical conduction mode (CrCM) and continuous conduction mode (CCM), as well as burst and skip modes for different load conditions. This adaptability makes it ideal for different regional power sources and device types in a USB-C PD charger.
The EZ-PD PAG2 family consists of four specialized products.
- The EZ-PD PAG2S-AC is a secondary-side ACF controller with efficient energy recycling and includes the USB-PD protocol functionality.
- The EZ-PD PAG2S-QZ, another ZVS controller, focuses on QR-ZVS flyback and includes the USB-PD protocol functionality.
- The EZ-PD PAG2P is a primary HV startup controller that integrates various functions for improved system performance. It includes high-voltage startup, PET receiver, gate drivers, and fault protection. EZ-PD PAG2P also features an x-cap discharge and a V cc boost converter.
- The EZ-PD PAG2S-PS is an integrated USB PD and synchronous-rectification (SR) controller that can be paired with third party pulse-width-modulation (PWM) controllers. It features a shunt voltage regulator for constant voltage and current control via optocouplers. It offers best-in-class SR performance with fast turn-on/off time and supports volt-second integration to prevent false SR activation.
The EZ-PD PAG2 family is now available for USB-C charger designs. The EZ-PD PAG2S-QZ and EZ-PD PAG2S-AC are available in a 32-pin QFN package, and the EZ-PD PAG2S-PS is available in 32-pin QFN and 24-pin SOIC packages. The EZ-PD PAG2P has two variants: non-x-cap discharge mode and x-cap discharge mode, both available in a 14-pin SOIC package.
Other ZVS articles
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