Power factor corrected LED driver

31 March 2010 Opto-Electronics

Newly released by ON Semiconductor is the NCL30000, a power factor corrected dimmable LED driver for residential and commercial lighting applications.

Housed in a compact 8-pin surface mount package, the device achieves high power factor (> 0,95) in a single-stage topology by using a critical conduction mode (CrM) flyback architecture, thereby eliminating the need for a DC-DC conversion stage. Constant on-time CrM operation is particularly suited to isolated flyback LED applications, as the control scheme is straightforward and very high efficiency can be achieved, even at low power levels. This is important in LED lighting in order to support compliance with regulatory requirements and meet overall system efficacy requirements.

Typical applications include LED driver power supplies, LED-based down-lights, TRIAC-dimmable LED-based lamps and power factor corrected constant voltage supplies. This device is compatible with both leading edge TRIAC-based and trailing edge transistor-based dimmers. Depending on the dimmer used, the LED output can be controlled down to within 2%. Three reference designs are provided and are intended to drive from four to 15 LEDs at 350 mA. They can also be modified to support power levels ranging from 5 W to 30 W.

An operating temperature range of -40°C to +125°C ensures the NCL30000 can be used across environmental operating ranges specified in the majority of solid state lighting applications. It has a low startup current of 24 μA and a low operating current of 2 mA. Other key features include a programmable on-time limiter, zero current detect sense block, gate driver, plus all other pulse width modulation (PWM) circuitry and protection functions needed to implement a CrM switch mode power supply.

For more information contact Dennis Walden, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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