MT777XH is a high precision constant current LED driver with integrated rectifier bridge and ultra-fast recovery freewheeling diode, operates under critical conduction mode (CRM). It’s mainly targeted for non-isolated buck LED power systems.

MT777XH is suitable for applications with 85Vac~265Vac input voltage range. The chip supports adjustable over-voltage protection. Furthermore, OVP pin integrates enable/disable function to support color temperature switch and sensor light applications.

The high precision and fast current sensing circuit can support high frequency switch operation and get excellent line regulation. The system operates under CRM which makes the output current is insensitive to the inductance and keeps good load regulation.

MT777XH provides various protections to improve the system reliability, including short-circuit protection (SCP), adjustable over-voltage protection (OVP) and thermal adjustment, etc.

MT777XH integrates rectifier bridge, freewheeling diode and MOSFET. With innovative internal high-voltage power supply solution, no external VCC capacitor and startup resistor are needed, which achieves simplified peripheral circuits and low BOM cost.

• Integrated rectifier bridge

• Internal ultra-fast recovery freewheeling diode

• No VCC capacitor and startup resistor

• Supports high frequency switch operation, SMD inductor can be used

• Operates under CRM, insensitive to the inductance.

• Adjustable moisture-proof LED over-voltage protection (OVP)

• No flicker at low line voltage

• OVP pin with enable/disable function to support color temperature switch and sensor light applications

• Highly accurate constant LED current:±5%

• LED short circuit protection

• Under-voltage lockout (UVLO) protection

• Set different output OVP thresholds through OVP pin

• Thermal regulation function

• Available in ASOP7 package