PI (Power IntegraTIons) just launched the LYTSwitch-1 high P (greater than 0.9), high efficiency (90%) non-isolated LED constant current drive solution at the beginning of June this year, and launched a new single-stage non-phase in mid-July. Isolated buck dimmable LED driver solution, this is the LYTSwitch-7 series of LED drivers.
Available in an ultra-thin SO-8 package, these devices offer 22W of output power without the need for a heat sink and are extremely efficient for use in bulbs, tubes and other lighting applications. The LYTSwitch-7 solution is designed to meet the requirements of a TRIAC dimmer with a simple passive attenuation circuit without the need for a bleeder circuit.
Figure 1: PI new high P stroboscopic TRIAC dimmable non-isolated solution LYTSwitch-7
In addition, the inductors in the design can be made from commercially available standard inductors with only a single winding. The LYTSwitch-7 is designed to reduce the number of components to only 20, while the typical dimmable LED constant current drive scheme currently on the market typically requires approximately 35 components.
Figure 2: A19 LED Bulb and Candle Light Evaluation Board Based on PI LYTSwitch-7
The LYTSwitch-7 IC provides a phase-cut (thyristor) dimming solution with a wide dimming range and unidirectional dimming response. LED drivers achieve efficiencies of more than 86%, approximately 2% higher than traditional dimming products, and feature high power factor, precise regulation, and comprehensive protection. They are suitable for both low input voltage and high input voltage designs, as well as for a wide range of input designs in commercial lighting applications in the United States. The LED driver's input power range is between 90 VAC and 305 VAC and provides thyristor dimming in low voltage applications.
Hubertus Notohamiprodjo, Director of PI Product Marketing, said: "Our latest LYTSwitch-7 LED driver ICs offer a rugged, high-reliability design that minimizes the number of BOM components and is approximately 40% less than conventional circuits. Built-in 725 V The MOSFET provides better withstand voltage during input surges, while the bleeder-free circuit is designed to ensure that there is no excessive heat generation inside the driver when compatible with many TRIAC dimmers. Drives are more efficient and reliable."
PI Jinguang, senior technical training engineer of PI, said: "The unique algorithm adopted by LYTSwitch-7 makes it completely eliminate the output illumination caused by noise at the input end. Its unique critical working mode and package thermal design also make the EMI generated by the whole solution very Low. In addition, due to its unique algorithm and relatively small EMI filter components, its dimming compatibility is also very good, supporting Lutron, LEVITON, COOPER and LEGRAND TRIAC dimmers."
Like all PI LED drivers, the LYTSwitch-7 IC offers a range of protection features, including thermal foldback protection that allows the drive to shut down immediately. In an abnormally high temperature environment, this feature automatically reduces the output current and darkens the LEDs, which protects the IC, the driver, and the entire fixture. Developers have found that thermal foldback features help reduce the electrical and mechanical costs of meeting reliability goals. Because the IC can automatically react to an abnormal increase in temperature automatically without the lamp being extinguished. The device also provides open circuit, short circuit, input and output overvoltage, overcurrent, and safe operating area (SOA) protection.
The LYTSwitch-7 IC complies with several international standards: DOE Level 6 (external power supply), CEC TItles 20 and 24, ENERGY STAR Version 2.0 Lamp Energy Efficiency Specification, NEMA SSL-7A, and EN61000-3-2 (C&D).
Key target applications include low-cost A19 bulbs, small-sized bulbs (such as candle lights and GU10 bulbs), commercial and industrial applications, ceiling lamps and downlights. The LYTSwitch-7 IC sample is now available for ordering. The unit is priced at $0.33 each in 10,000-piece quantities. There are now two reference designs (DER-539 and DER-540) available for download from PI at https://.
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