The NCL30083 is a PWM current mode controller targeting isolated flyback and non-isolated buck-boost constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the 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 the NCL30083 has integrated fixed overvoltage protection, the designer has the option to program a lower overvoltage protection level.
●Features | | Benefits
●---|---|---
● | | | | |
● Primary Side Sensing
●| |
● No optocoupler or secondary control circuitry required
● Wide VCC Range
●| |
● Allows support for wide number of LEDs in string and simplifies transformer design
● Precise LED Current Regulation of ±1% typical
●| |
● No need for binning of LED forward voltage or trimming in production for accuracy
● ~ 0.9 power factor with passive valley fill
●| |
● Meets Energystar® LED Bulb and Residential Luminaire Standards
● User Programmable Thermal Foldback
●| |
● Protects system from overheating by gracefully reducing current
● Open and Shorted Output Protection
●| |
● Robust handling of faults
● Secondary Diode Short Protection
●| |
● Avoids overheating in fault conditions
● 5 Step Dimmable to < 5% output current
●| |
● Allows dimming with standard wall switch
● VCC undervoltage and overvoltage protection
●| |
● Reliable operation across all conditions
● Latched (A version) and Auto-recoverable (B version) fault handling
●| |
● Flexiblity in design
● Wide temperature range of -40 to 125 °C
●| |
● Supports outdoor and high temperature operating environments
● Input Line Voltage Sensing
●| |
● Enhanced regulation accuracy
● Programmable Soft start
●| |
● Improves startup behavior
