GaN switch for compact smart LED lighting

September 15, 2020 //By Nick Flaherty
GaN switch for compact smart LED lighting
The LYTSwitch-6 GaN switch from Power Integrations enables dimmable 90 W LED ballasts with an isolated flyback topology following a boost Power Factor Correction (PFC) stage

Power Integrations is extending its roll out of gallium nitride technology to smart LED lighting with a new smart switch family.

The LYTSwitch-6 family of safety-isolated LED drivers for smart lighting applications uses Power Integrations’ PowiGaN™ gallium nitride (GaN) technology to deliver efficiency and performance benefits, demonstrated by a new design example.

The PowiGaN-based LYT6078C IC incorporates a 750 V power switch and delivers flicker-free output up to 90 W with other members of the family providing up to 110 W. Including both the PFC stage and the LYTSwitch-6 LED driver, system efficiency exceeds 90 per cent. Housed in the miniature InSOP-24 surface-mount package, LYTSwitch-6 ICs are protected by an advanced thermal fold-back system, which reduces output power to limit device temperature during abnormal conditions, while still providing light output. 

The LYTSwitch-6 GaN ICs also incorporate Power Integrations’ FluxLink communication technology, which allows secondary-side control without the need for an optocoupler, and provides better than ±3% CV and CC regulation across line, load, temperature, and manufacturing.  All LYTSwitch-6 ICs exhibit fast transient response and easily support pulse-width-modulation (PWM) dimming.

The reference design has two-stage PFC boost plus isolated flyback on a dimmable LED ballast. It employs the LYTSwitch-6 LYT6078C IC and Power Integrations’ HiperPFSTM-4 PFS7624C PFC controller and provides peak efficiency of greater than 91 percen when driving a 48 V LED string at 1350 mA from a 220 VAC to 277 VAC input. In standby mode, system power consumption is less than 80 mW, which provides engineers with substantial flexibility when designing lighting controls and particularly dim-to-off circuits.

“Power Integrations’ new PowiGaN-based LYTSwitch-6 ICs save lighting manufacturers space and system costs for smart lighting power supplies. The company’s key design goals for our latest design report were high power factor, low harmonic content, high efficiency, and 3-in-1 dimming with zero-to-100% output current. The new LYT6078C driver IC combined with our HiperPFS-4 PFC controller easily met these challenges,” said Hubie Notohamiprodjo, director of product marketing for LED lighting.

PowiGaN-based LYTSwitch-6 LED-driver ICs are available now, priced at $2.52 in


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