The ZSLS7031 is a highly efficient primary-side controlled peak current mode LED driver specifically designed for driving high-brightness LEDs in both isolated and non-isolated flyback configurations. This versatile chip supports active power factor correction (PFC), making it suitable for a wide range of lighting applications. Operating in discontinuous conduction mode at a constant frequency, the ZSLS7031 ensures stable performance while delivering constant power to the output. One of its standout features is the absence of the need for an optocoupler, TL431 shunt regulator, or any secondary-side feedback devices, simplifying the overall design process.
With an impressive input voltage range of 85VAC to 265VAC, the ZSLS7031 offers flexibility across various global power standards. It also integrates robust protection mechanisms, including overcurrent protection, overvoltage protection, and thermal shutdown, which automatically halts operation when temperatures exceed safe limits. These safety features ensure reliable performance under demanding conditions.
Key advantages of the ZSLS7031 include high efficiency, minimal component count, compact packaging, and no requirement for loop compensation. Its ability to handle both isolated and non-isolated applications makes it a flexible solution for designers aiming for versatility in their product lineup.
In terms of specific features, the ZSLS7031 boasts a power factor (PF) typically exceeding 0.95, depending on the application. It supports a broad input voltage range of 85V to 265VAC, internal over-temperature protection, and output overvoltage protection (OVP). Additionally, it provides primary-side output overcurrent protection (OCP). The chip is available in an MSOP-8 package, fully compliant with RoHS standards, and operates within a temperature range of -45°C to 105°C, with a maximum junction temperature of 150°C.
Applications for the ZSLS7031 span a variety of LED lighting products, including LED bulbs, LED tube lights, and general LED lighting solutions. For instance, the evaluation kit ZSLS7031KIT-D1 comes equipped with a 17W flyback converter and demonstrates excellent performance metrics such as universal input voltage support, active PFC with a power factor above 90%, and efficiency exceeding 85%. With only a few external components required, this demo board showcases the simplicity and effectiveness of the ZSLS7031.
Included in the ZSLS7031KIT-D1 demo kit are the ZSLS7031PCB-D1 demo board, five ZSLS7031ZI1R IC samples, and detailed startup information. The demo board itself highlights several notable features, such as universal voltage compatibility, active PFC, high efficiency, and protection against overcurrent, overvoltage, and overheating. It delivers constant power output of up to 15W and supports LED loads ranging from 9 (approximately 24V forward voltage) to 19 (52V), with potential for even higher loads when used with lower AC inputs like 230VAC.
For those interested in further exploration, the demo board’s bill of materials and PCB design offer valuable insights into implementing the ZSLS7031 in practical applications. The accompanying circuit diagram and image resources make it easier to visualize how the chip functions in real-world scenarios. Whether you're designing LED bulbs, tube lights, or other general lighting solutions, the ZSLS7031 stands out as a powerful and efficient option that combines advanced features with user-friendly implementation.
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