ON Semiconductor has announced two new QR PSR PWM controllers for LED lighting with power factor control (PFC) function. The dimmable NCL30386 and the non-dimmable NCL30388 provide options for designers of LED lighting units such as luminaires used in office and industrial building applications.
Both devices are high power factor, single stage, constant current and constant voltage, primary side regulated pulse width modulation controllers for flyback, buck-boost or Sepic power topologies. They operate in quasi-resonant mode to achieve efficiency levels that exceed those stipulated in power standards such as the EU’s Ecodesign as well as ENERGY STAR and the NEMA SSL regulations.
The integrated digital PFC algorithm ensures a power factor of greater than 0,95 and total harmonic distortion (THD) of less than 10% across a universal input voltage range. Integrated high-voltage startup current source ensures fast startup, low standby power and wide-range operation at the output. Current and voltage are regulated via a digital primary side regulated CC/CV loop control, typically achieving in the region of ±2%, to give highly uniform lighting brightness under all conditions.
The devices are simple to use and operate from a wide Vcc range of 9,2 - 26 V d.c., with valley lock-out and frequency foldback ensuring high efficiency across the entire voltage range. Design is further simplified by the inclusion of safety features such as brown-out and over-voltage protection, plus the ability to detect short circuits in the output, winding and diode.
Neither the NCL30386 nor the NCL30388 require many external components to complete the design. Additionally, the NCL30386 offers dimming features, including the option for either linear or quadratic dimming curves. The wide analog dimming range is controlled by two dedicated analog / PWM control pins that allow for precise dimming with a 0,5% minimum dimming ratio and no audible noise present.
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