AC/DC flyback controllers enable higher power density GaN-based flyback converters

Nexperia has introduced a new series of AC/DC flyback controllers, the latest additions to its continuously expanding portfolio of power ICs. The NEX806/8xx and NEX8180x are designed for GaN-based flyback converters in devices such as PD chargers, adapters, wall sockets, strip sockets, industrial power and auxiliary power supplies, and other AC/DC conversion applications requiring high power density.

The devices are quasi-resonant/multi-mode flyback controllers which operate from a wide VCC range (10-83V), while the NEX81801/NEX81802 are adaptive synchronous rectifier controllers. These ICs can be employed in combination with the company's NEX52xxx PD controllers and other discrete power devices to deliver a turn-key flyback converter solution that optimises the current sense voltage level and PFM mode, lowers standby power, and attains high efficiency across the entire load range. The primary side controller can be used to drive a silicon MOSFET or GaN HEMT directly, which helps to improve power density, while the SR controller uses an innovative adaptive control method to eradicate the possibility of mis-conduction of switching device, thereby improving overall system reliability.

This family of flyback controller ICs employs the TSOT23-6 flip-chip package to provide better thermal performance and help prevent accidental triggering of the over-temperature protection function. The control circuit also includes extra protection features, making it ideal for consumer and industrial flyback power supply designs.