Date: 1st Mar 2010

Power factor corrected LED driver from ON Semiconductor supports TRIAC dimming

ON Semiconductor has launched new power factor corrected (near to unity power factor) dimmable LED driver for LED lamps used to replace other non-green lighting in residential and commercial buildings.

The NCL30000 is a switch mode power supply controller in flyback architecture used for driving isolated flyback LED drivers and eliminates the use of DC/DC voltage converter stage. It employs a Critical Conduction Mode (CrM) control technique to correct the power factor over wide input voltages and output power.

Constant on-time CrM improves power efficiency at lower power, making this IC comply with regulatory requirements and meet overall system efficacy requirements.

The suggested applications of this LED driver include power supplies, LED-based down lights, TRIAC dimmable LED-based lamps and power factor corrected constant voltage supplies. This IC is designed to work with both TRIAC and trailing edge line dimmers. Based on the dimmer used, the LED output can be controlled down to less than 2%.

ON Semiconductor is providing three reference designs with power output up to 15 Watts. This device can drive 4-15 LEDs at 350 mA. However they are flexible enough to support power output range of 5 W to 30 W

The reference designs are:
NCL30000LED1GEVB: 115 Vac version, 90 to 135 Vac input voltage (Dimmable)
NCL30000LED2GEVB: 230 Vac version, 180 to 265 Vac input voltage (TRIAC Dimmable)
NCL30000LED3GEVB: Extended universal version, 90 to 305 Vac input voltage

Operating temperature range: -40 Deg C to +125 Deg C making them suitable for solid-state lighting applications.
The NCL30000 features low startup current of 24 micro amps (µA) (typical) and a low operating current of 2 milli amps (mA) (typical) to further improve the energy efficiency.

NCL30000 also features programmable on time limiter, zero current detect sense block, gate driver, pulse width modulation (PWM) circuit and protection functions needed to implement a CrM switch mode power supply.

"Our customers have a need for dimmable LED driver solutions that are compatible with existing wiring and controls," said Christophe Warin, AC-DC business unit manager at ON Semiconductor. "The NCL30000 offers excellent dimming performance down to greater than 2 percent. This device is ideally suited for isolated flyback but can also be used with non-isolated buck topologies."

Package: SOIC
Price: Each $0.45 per unit in 10K units
Availability: Now in samples.
RoHS compliant: Yes

For more data visit www.onsemi.com