The MT9515LS is a high-PF, non-isolate, BUCK LED Driver IC. MT9515LS works in Quasi-Resonant Mode (QRM), which improves both of efficiency and EMI performance.
The system integrates the ultra-high voltage power supply circuit. The external VDD capacitor is not needed. The system realizes error integration through internal digital integrator, which eliminates COMP pin and COMP capacitor. MT9515LS can meet low THD and odd harmonic requirements through internal THD compensation circuit.
Various protections with self-recovery, such as input over voltage protection (OVP), cycle-by-cycle over current protection (OCP), over temperature protection, output short-circuit protection, output open-circuit protection, etc. are embedded to improve reliability. The chip programs the output over voltage protection threshold through an external circuit connection to the ROVP pin (e.g. open circuit, GND or a resistor with different resistance values).
The MT9515LS integrates feedback circuit and high voltage MOSFET, which further simplifies external circuit and saves the BOM cost.