Forced-frequency-resonant digital controller IC has zero-voltage switching
Believed to be the first flyback controller in the industry with zero-voltage switching (ZVS) on the primary side to achieve high efficiency, the XDPS21071 has been introduced by Infineon Technologies.
The digital power controller is aimed at fast-charging applications such as USB-PD or QuickCharge. Light-load efficiency is optimised for variable output application.
The XDPS21071 is a high-performance digital flyback controller with an integrated dual-MOSFET gate driver and a 600V depletion start-up unit. The primary side controller drives a high-voltage external MOSFET in a flyback topology and an external low-voltage MOSFET to create a pulse for achieving ZVS condition at the high-voltage MOSFET. It supports fixed-frequency switching up to 140kHz.
The patented forced-frequency-resonant (FFR) switching scheme is implemented by a digital algorithm, which is configurable via parameter settings (UART port is included) to meet application requirements and the conversion efficiency of international regulatory standards (i.e., EU CoC version 5 Tier 2 and DoE Level VI).
An intelligent, self-adaptive multi-mode operation matches each line/load conditions with the best-fit operational mode (i.e., FFR, CrCM, burst mode) for ease of design and system optimisation, says Infineon. ZVS operation enables for lowest switching losses. Highest system performance is achieved by only a minimal adder in bill of materials (BoM) cost. The XDPS21071 controller comes with adaptive overcurrent protection. It is lead-free and RoHS compliant.
The XDPS21071 in DSO-12 SMD package is now available. From March, Infineon will also offer a 45W USB-PD Type-C quick charger reference design (REF_XDPS21071_45W1) featuring its digital flyback controller XDPS21071, 700V CoolMOS P7 Superjunction MOSFET (IPD70R360P7S), OptiMOS PD synchronous-rectification MOSFET (BSC0805LS) and small-signal-MOSFET (BSL606SN).
