InnoSwitch3-PD reference design reduces component count

Using integrated boost power factor correction (PFC) and GaN flyback switcher ICs,  Power Integrations says its DER-937 reference design to implement a 100W USB PD (power delivery) charger has a low component count of just 117 components. 

The reference design describes a USB PD charger based around Power Integrations’ InnoSwitch 3-PD PowiGaN flyback switcher and HiperPFS-4 PFC controller ICs. It contains the power supply specification, schematic, PCB layout, bill of materials, detailed magnetics specifications and performance data of a PFC 100W USB PD 3.0 and programmable power supply (PPS) charger using only 117 components.

“This USB PD charger design reaches efficiency levels in excess of 93 per cent, including input, PFC and flyback stages,” says Aditya Kulkarni, senior product marketing engineer at Power Integrations. 

The circuit requires less than 40mW no-load input power at 230V AC. Bill of material (BoM) count is approximately half that of conventional designs, says the company, saving space, reducing design time and simplifying component sourcing.

The InnoSwitch3-PD INN3870C off-line quasi-resonant flyback switcher combines a USB Type C and USB PD controller, high-voltage PowiGaN GaN switch, synchronous rectification and FluxLink feedback. The HiperPFS-4 PFS7628C PFC controller IC, available with an integrated Qspeed low reverse recovery charge (Qrr) boost diode, delivers greater than 98 per cent efficiency across the full load range.

DER-937 is available to download on the Power Integrations website.

Power Integrations specialises in semiconductor technologies for high-voltage power conversion. The company’s products are used in the clean-power ecosystem, enabling the generation of renewable energy as well as the efficient transmission and consumption of power in applications ranging from mW to MW. 

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