The NCL30185 is an AC-DC power factor corrected flyback controller targeting isolated and non−isolated buck-boost/SEPIC constant current LED drivers. The controller operates in a quasi−resonant mode to provide optimal efficiency. Thanks to a novel control method, the device is able to tightly 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. This controller has integrated 3 step log dimming which allows an LED bulb or luminaire to be dimming from a standard wall switch.In addition to steps of 70% and 25% which are similar to a traditional 3 way lamp, one additional step of 5% current is included to support deep dimming applications.

• Constant Current Control with Primary Side Feedback
• No need for binning of LEDs or production trimming for accuracy
• 3 dimmable steps of 70%, 25%, and 5% of full current
• Line Feedforward for Enhanced Regulation Accuracy
• Wide Vcc operating range
• User Programmable Thermal Foldback
• Output LED open and short protection
• Secondary Diode Short Protection
• VCC undervoltage and overvoltage protection
• Wide Temperature range of -40 to 125 °C
• Auto-recoverable (B-version) and Latched (A-version) fault handling options