LED Luminaries

LED news and insight from our technology editor Steve Bush, who has been messing with LED lighting for more years than he would care to remember.

LED driver integrates PFC and isolated step-down AC-DC power conversion

ON Semiconductor has an LED driver that integrates power factor correction (PFC) and isolated step-down AC-DC power conversion in a single stage, writes Richard Wilson.

Intended for LED-based street lighting and architectural lighting applications of between 40W and 150W, the NCL30001 is designed to operate in continuous conduction mode (CCM) and can be configured as either a constant current or fixed output voltage driver.

There is an adjustable operating frequency of 20 kHz to 250 kHz and a multi-function latch-off pin able to implement an overtemperature shutdown circuit.

Another feature is a high voltage start-up circuit, voltage feed forward which is designed to improve loop response.

The chip has a brownout detector, internal overload timer, latch input and a high accuracy multiplier to reduce input line harmonics.
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An isolated single stage power factor corrected LED Driver evaluation board is available for this device that is intended for applications ranging from 40 W – 100 W that require a direct constant current output.

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Tags: driver evaluation, feed forward, high voltage, power conversion, step down

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