All-in-one flyback converter with capacitive isolation for USB PD adaptors

All-in-one flyback converter with capacitive isolation for USB PD adaptors

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By Nick Flaherty

The MPX2001 combines four flyback ICs into one chip with UL-qualified 4.5kVrms capacitive isolation and 8.4mm primary-to-secondary PCB clearance. Continuous conduction mode (CCM) secondary-side control improves dynamic performance over traditional solutions and provides quick short circuit and over voltage protection.

The integration eliminates multiple passive components, resulting in PCB board space saving and cutting the bill of materials (BOM) in half. The MPX2001 provides a 15mW standby power while allowing design optimisation with the engineers’ choice of primary and secondary MOSFETs. PWM/PFM control provides excellent EMI across the entire load range, free of audible noise that often exists with alternative control schemes. The driver design minimises body diode conduction of the MOSFET while eliminating any cross-conduction concerns while the capacitive isolation replaces traditional optocouplers to ensure reliable, long-term operation.

“The MPX2001 is ideal for very tight USB PD and QC-compatible adaptor designs,” said Maurice Sciammas, Sr. VP Marketing & Sales at MPS, “As it helps designers achieve higher power density, meets most stringent energy efficiency requirements, and easily copes with demanding dynamic USB PD load changes.”

The MPX2001 is UL1577 and UL/IEC/EN62368 safety-certified, is available in an MSL1-rated SOIC20WB package and is priced at $1.29/10K.

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