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Maximizing IC Performance Non-isolated APFC BUCK LED Driver Tel: 86-10-62662828 Copyright © 2020 Maxic Technology Corporation Page 1

DESCRIPTION

The MT9512LS is a high -PF, non-isolate, BUCK LED Driver IC. MT9512LS works in Quasi-Resonant Mode ( QRM), which improves both of efficiency and EMI performance. The system integrate s 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. MT9512LS can meet low THD and odd harmonic requirements through internal THD compensation circuit. Various pro tections 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 MT 9512LS integrates feedback circuit and high voltage MOSFET, which further simplifies external circuit and saves the BOM cost.

APPLICATIONS

 LED bulb, Spotlight  LED tube  Other LED lighting applications

FEATURES

 Single-stage active power factor correction (PF > 0.90)  Integrated ultra-high voltage power supply without external VDD capacitor and external power supply circuit  Embedded digital integrator, no COMP capacitor needed  Integrated THD compensation circuit  Integrated odd harmonic compensation circuit for high subharmonic distortion suppression  Internal line voltage compensation  Internal demagnetization sensing, no external feedback circuit needed  High accurate LED current  Good Line and Load Regulation  Quasi-Resonant mode (QRM) operation  Integrated Input OVP, when input voltage is higher than 375Vac, turns off the power switch, resumes at input voltage below 320Vac. Enhances anti-surge capability and improves system reliability  Set different output OVP thresholds through ROVP pin  Various protections and self-recovery  Power on soft-start  Available in SOP7 packages Typical Application Circuit MT9512LS HV ROVP DRAIN CS GND L N BRG DRAIN R1 Rcs NC