GaN switcher combines AC-DC and DC-DC stages to slash power

GaN switcher combines AC-DC and DC-DC stages to slash power

Technology News |
By Nick Flaherty

Power Integrations has developed a multi-channel gallium nitride switcher that combines the AC-DC and DC-DC stages to cut power consumption in half.

The InnoMux-2 family of multi-output offline power-supply switcher chips provide up to three independently regulated outputs for use in white goods, industrial systems, displays and other applications requiring multiple voltages.

Typical applications include TVs, monitors, appliances, networking, home and building automation, LED emergency lighting and industrial power supplies.

Elimination of separate DC-DC stages slashes component count, reduces PCB footprint and increases efficiency by as much as 10 percentage points compared to traditional two-stage architectures. Efficiency is aided by the 750 V PowiGaN gallium-nitride transistors, zero-voltage switching (without an active clamp) and synchronous rectification.  

 “Most modern electronic systems rely on multiple internal voltages to operate various functions such as computing, communication and actuation function – typically heat, light, sound or motion of some kind. But losses in each conversion stage are compounded, degrading system performance and generating heat. The InnoMux-2 IC overcomes this challenge by providing up to three independently regulated voltage outputs or two voltage output and a constant current output from a single stage, achieving a compact and efficient power sub-system with low component count.,” said Roland Saint-Pierre, vice president of product development at Power Integrations.

The InnoMux-2 switcher delivers up to 90 watts of output power with accurate regulation of better than ±3 percent across the full input line, load, temperature and differential current step conditions. Total power system efficiency (AC to regulated low-voltage DC segment) is above 90 percent and the InnoMux-2 controller also manages light-load power delivery, avoiding the need for pre-load resistors and reducing no-load consumption to less than 30 mW.

This conserves power for necessary functionality in applications subject to the 300 mW allowance for standby usage under the European energy-using product (EuP) regulations.

The InnoMux-2 switcher devices use the Power Integrations thermally efficient InSOP24 and InSOP28 packages with PCB cooling, so no heatsink is required. Device options include dual- and three-output constant voltage (CV); optionally, one output may be dedicated to constant current (CC) drive, suitable for powering LEDs in displays or for high-speed charging of an internal battery.

Pricing for InnoMux-2 IMX2174F devices starts at $1.11 for 50,000-unit quantities. Data sheets, three reference design reports and an introduction video are immediately available.

The DER-714 reference design covers a 52 W TV design with one CV and one CC output while DER-715 covers a 23 W monitor design with one CV and four CC outputs and DER-716 covers a 62 W industrial and appliance design with three CV outputs.


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