NCL30083ADMR2G.

The NCL30083ADMR2G is a step dimmable Quasi-resonant primary side Current-mode Controller for LED lighting with thermal fold-back. This device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. The device supports 5 step log dimming down to 5%. To enhance system lifetime, it has current foldback at a user programmable temperature point. While this has integrated fixed overvoltage protection, the designer has the option to program a lower overvoltage protection level.

• Primary side sensing
• Wide VCC range
• Precise LED current regulation of ±1% typical
• ~0.9 Power factor with passive valley fill
• Open and shorted output protection
• Secondary diode short protection
• 5-step Dimmable to <lt/>5% output current
• Input line voltage sensing
• Programmable soft start
• Protects system from overheating by gracefully reducing current
• Robust handling of faults
• Avoids overheating in fault conditions
• Allows dimming with standard wall switch
• Reliable operation across all conditions
• Flexibility in design
• Enhanced regulation accuracy