High voltage GaN switch creates compact USB PD 3.1 adapters
The latest InnoSwitch4-CZ integrated switcher by Power Integrations boosts efficiency to 95 per cent, said the company, to create compact USB PD 3.1 adapters.
The high frequency, zero voltage switching (ZVS) flyback controller IC can be paired with Power Integrations’ ClampZero active-clamp IC and, optionally, the HiperPFS-5 GaN-based power factor corrector. The ICs “easily address” the latest USB PD 3.1 specification for adapters and chargers up to 220W, added the company.
The expanded power range of the InnoSwitch4-CZ and ClampZero ICs allow charger/adapter designers to easily exceed 23W per cubic inch for single and multiple-output USB PD 3.1 certified designs, explained Edward Ong, senior product marketing manager at Power Integrations. “The maximum switching frequency of up to 140kHz minimises transformer size, and the high level of integration approximately halves the number of passive components, MOSFETs and diodes that make safety-compliant PCB layout a challenge,” he added.
InnoSwitch4-CZ ICs include a robust 750V PowiGaN primary switch, active clamp drive and synchronous rectification in a compact InSOP-24D package. Secondary-side sensing – achieved using Power Integrations’ FluxLink high speed communications technology – provides exceptional CV/CC accuracy.
A non-complementary-mode active clamp enables designs that work in both continuous (CCM) and discontinuous (DCM) modes. Operating across modes means it is for the IC to support the wide load/range conditions often encountered in USB PD applications.
InnoSwitch4-CZ ICs consume less than 30mW at no-load, including input line voltage monitoring. Protection features include auto-restart or latching fault response for output over- and under-voltage. multiple output under-voltage fault thresholds and latching or hysteretic primary over-temperature protection.
There is also a compact 130W, USB PD adapter reference design available. The DER-957 allows designers to evaluate the InnoSwitch4-CZ flyback controller IC and ClampZero active clamp IC chipset.
The ICs are available now from Power Integrations or one of the company’s authorised distributors: Digi-Key, Farnell, Mouser and RS Components.
Power Integrations specialises in high voltage power conversion, enabling the generation of renewable energy as well as the efficient transmission and consumption of power in applications ranging from milliwatts to megawatts.
