Power Integrations has unveiled new safety-isolated LED-driver chips featuring high efficiency and very low standby power ideal for smart lighting and ballast applications. Applications can be seen in smart residential and commercial fixtures and low-profile ceiling troffers.
LYTSwitch-6 ICs are ideally suited to smart lighting applications with multiple outputs. By eliminating heatsinks and optocouplers and reducing the size of the output capacitor by as much as 30%, component count and system size are also reduced.
LYTSwitch-6 ICs deliver flicker-free output up to 65 W, up to 94% efficiency and as little as 15 mW standby power, with configuration options for two-stage or single-stage PFC support. The chips also exhibit fast transient response.
The LED drivers also include both constant-voltage (CV) and constant-current (CC) operation, enabling lighting manufacturers to reduce the number of product variants, resulting in manufacturing and logistics savings.
An advanced thermal foldback system prevents overheating of chips while delivering as much light as thermally possible in any circumstance or installation.
A built-in 650 V or 725 V MOSFET and secondary-side FluxLink control eliminates the need for an optocoupler and provides highly accurate output with better than 3% CV and CC over line, load and temperature, the company claimed.
Power conversion for the flyback stage is more than 94% efficient, achieved by using synchronous rectification and quasi-resonant switching which enables high power output without a heatsink. For example, a 35 W, 12 V, 2.92 A design with an additional PFC circuit has been demonstrated to be over 89% efficient.
Standby power is less than 15 mW in universal AC input conditions – even with line voltage sensing, which allows the IC to protect itself from mains voltage surges and swells.
LYTSwitch-6 LED-driver ICs are available now, priced at $0.84 in 10,000 quantities.
A reference design describing a 35 W PWM-dimmable LED power supply is available for download at: https://www.power.com/lytswitch-6/
View Press release: https://investors.power.com/investors/press-releases/press-release-details/2018/LYTSwitch-6-LED-Drivers-From-Power-Integrations-Feature-High-Efficiency-and-Very-Low-Standby-Power/default.aspx