●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
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● Primary Side Sensing
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● No optocoupler or secondary control circuitry required
● Wide VCC Range
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● Allows support for wide number of LEDs in string and simplifies transformer design
● Precise LED Current Regulation of ±1% typical
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● No need for binning of LED forward voltage or trimming in production for accuracy
● ~ 0.9 power factor with passive valley fill
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● Meets Energystar® LED Bulb and Residential Luminaire Standards
● User Programmable Thermal Foldback
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● Protects system from overheating by gracefully reducing current
● Open and Shorted Output Protection
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● Robust handling of faults
● Secondary Diode Short Protection
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● Avoids overheating in fault conditions
● 5 Step Dimmable to < 5% output current
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● Allows dimming with standard wall switch
● VCC undervoltage and overvoltage protection
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● Reliable operation across all conditions
● Latched (A version) and Auto-recoverable (B version) fault handling
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● Flexiblity in design
● Wide temperature range of -40 to 125 °C
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● Supports outdoor and high temperature operating environments
● Input Line Voltage Sensing
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● Enhanced regulation accuracy
● Programmable Soft start
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● Improves startup behavior
