GaN-powered LYTSwitch-6 LED drivers boost smart lighting designs

Dimmable 90W LED ballasts can be enabled in an isolated flyback topology, says Power Integrations, at the announcement of the latest member of the LYTSwitch-6 family. The LYT6078C uses Power Integrations’ PowiGaN GaN technology for performance and efficiency.

The LYT6078C IC incorporates a 750V power switch and delivers flicker-free output up to 90W with other members of the family providing up to 110W. 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, the 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. LYTSwitch-6 ICs also incorporate Power Integrations’ FluxLink communication technology, which allows secondary-side control without the need for an optocoupler, and provides better than ± three per cent 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, says Power Integrations.

Using a LYTSwitch-6 LYT6078C IC and Power Integrations’ HiperPFSTM-4 PFS7624C PFC controller in a two-stage PFC boost, plus isolated flyback on a dimmable LED ballast, provided peak efficiency of greater than 91 per cent when driving a 48V LED string at 1350mA from a 220 to 277V AC input, reports the company. In standby mode, system power consumption is less than 80mW, which provides design flexibility in lighting controls and particularly dim-to-off circuits, Power Integrations.

PowiGaN-based LYTSwitch-6 LED-driver ICs are available now.

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 milliwatts (mW) to megawatts (MW).

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