Based on a platform that supports both flyback and buck topologies, and designed for primary-side regulation (PSR), the AL1788 eliminates the need for optically coupled feedback from the secondary side and therefore provides excellent performance such as up to 91% Efficiency, excellent line and load regulation of 2% for complete line and load regulation, and low standby power of less than 0.2 watts.
With a PFC of> 0.9 and low standby power compared to competitive products, the AL1788 uses an external MOSFET operation to provide a constant voltage for the LED load. The high power factor is achieved through constant timing operation and its quasi-resonant mode valley switching method can be significantly Reduce switching loss, and provide excellent EMI performance.
Through the use of PSR, the complexity of the secondary side is reduced, thus providing a smaller overall form factor suitable for solid state lighting installations.When feedback from the auxiliary winding coupled to the secondary windings operates in constant voltage mode , Will adjust the output voltage.
The AL1788 maintains remarkable PFC and THD performance over a wide input range of 50% to 100% load. The AL1788 features a low start-up current of only 3μA with 500μA operating current (typical) and operates in Burst Mode. The AL1788 assists users in designing with low standby power system requirements.
This product has a complete built-in protection, including output open-circuit protection and output short-circuit protection, and over-current, over-voltage and over-temperature protection.
The AL1788 is currently available in a controller-only version and in a SOT26 (SC74R) package. The MOSFET regulator options are available in SO-7 package and are expected to be introduced in 2018. Both versions are lead-free, halogen and antimony-free, and fully compliant RoHS standards.
The AL1788 controller supplies quantities in 1,000 units.
For more information, see www.diodes.com