Summary:APFC, PWM/Analog Dimmable Isolated LED Driver
The MT7980 is an isolated high power factor (PF) LED Driver. It works under Quasi-Resonant Mode (QRM) which reduces both of current and voltage stress greatly, helps to improve EMI performance and efficiency. The output LED current is sensed by MT7980 with Quasi-full-cycle sensing (QCS) technology, accurate LED current regulation is achieved.
The MT7980 is specially designed for intelligent dimming application. Dimming of LED current can be achieved by decoded PWM or analog signal. The accuracy and consistency of LED current, especially at low dimming level, is achieved by the internal trimming decoder. As Dimming level becomes lower, the switching control method goes from QRM to PFM (Pulse Frequency Modulation) seamlessly. Then smaller output current and lower switching loss are achieved.
MT7980 provides varies of protections to improve the system reliability, including over voltage protection (OVP), over current protection(OCP), short circuit protection (SCP) and over temperature compensation, etc.