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Maximizing IC Performance Non-isolated APFC BUCK LED Driver Tel: 86-10-62662828 Copyright © 2021 Maxic Technology Corporation Page 1

DESCRIPTION

MT9545LR is a high- PF, non -isolated, BUCK LED Driver IC with integrated rectifier bridge and ultra-fast recovery freewheeling diode. MT9545LR works in Quasi -Resonant Mode (QRM), which improves both of efficiency and EMI performance. MT9545LR integrates the ultra-high voltage power supply circuit and external VDD capacitor is not needed. The system realizes error integration through internal digital integrator , which eliminates COMP pin and COMP capacitor. MT9545LR provides v arious protections with self-recovery, such as input over-voltage protection ( OVP), cycle-by-cycle over-current protection ( OCP), over-temperature protection, and output short-circuit protection, etc. to improve reliability. The chip provides the output over-voltage protection threshold through an external circuit connected to the ROVP pin (e.g. , open circuit, GND or a resistor with different values). MT9545LR integrates rectifier b ridge, freewheeling diode, 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 F > 0.70)
  • Integrated rectifier bridge
  • Internal ultra-fast recovery freewheeling diode
  • Integrated ultra-high voltage power supply without external VDD capacitor and external power supply circuit
  • Embedded digital integrator, no COMP capacitor needed
  • Internal line voltage compensation
  • Internal demagnetization sensing, no ex ternal feedback circuit needed
  • High accurate LED current
  • Good Line and Load Regulation
  • Operates in QRM
  • 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
  • Various protections with self-recovery
  • Set different output OVP thresholds throug h R OVP pin
  • Power on soft-start
  • Available in ASOP7 packages TYPICAL APPLICATION CIRCUIT MT9545LR HV ACIN DRA IN GNDROVP L N L1CSACIN AC Rcs