GaN chips boost power supply design to 75W

April 22, 2020 //By Nick Flaherty
Three GaN switches boost the efficiency of 75W power supplies for LED-backlit displays and consumer appliances
Three GaN switches boost the efficiency of 75W power supplies for LED-backlit displays and consumer appliances

Three GaN switches from Power Integrations support 75W power supply adapter designs without a heatsink. Previous devices supported 55W designs.

The three InnoSwitch3-MX isolated switcher chips work with the InnoMux controller for higher efficiency 75W power supplies for LED displays and appliances.

The InnoMux chipset uses a single-stage power architecture that reduces losses in display applications by 50 per cent when compared to conventional designs, increasing overall efficiency to 91 per cent in constant-voltage and constant-current LED backlight driver designs. Eliminating the need for post regulation buck and boost stages means TV and monitor designers can halve component count, improving reliability and reducing manufacturing cost. With a high breakdown voltage of 750 V, the PowiGaN InnoSwitch3-MX parts are also extremely robust and highly-resistant to the line surges and swells commonly-seen in regions with unstable mains voltages.

The InnoSwitch3-MX flyback switcher combines the primary switch, the primary-side controller, a secondary-side synchronous rectification controller, and PI’s innovative FluxLink high-speed communications link. This receives control instructions from its chipset partner InnoMux IC, which independently measures the load requirements of each output and directs the switcher to deliver the right amount of power to each output, maintaining accurate regulation of current or voltage.

"By using our PowiGaN technology we are able to address higher-output applications in TVs, monitors and appliances that employ LED displays. The chipset increases efficiency beyond the requirements of all mandatory regulations and improves manufacturers’ scores in EU efficiency labeling programs,” said Edward Ong, product marketing manager at PI.

Samples of the INN3478C, INN3479C, INN3470C InnoSwitch3-MX ICs are available now with prices starting at $2.52, $3.14 and $3.71 respectively in 10,000-piece quantities. Technical support for the chipset is available at:  ac-dc.power.com/products/innomux-family/

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