ON Semiconductor has announced the launch of a new power factor corrected dimmable LED driver for residential and commercial lighting applications.

NCL30000 is a switch mode power supply controller intended for low to medium power single stage power factor (PF) corrected LED Drivers.

NCL30000 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 for isolated flyback LED applications as the control scheme is straightforward and very high efficiency can be achieved even at low power levels. These are important in LED lighting to comply with regulatory requirements and meet overall system luminous efficacy requirements. In CrM, the switching frequency will vary with line and load and switching losses are low as recovery losses in the output rectifier are negligible since the current goes to zero prior to reactivating the main MOSFET switch.

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 < 2 percent.

Three up to 15 W reference designs are provided and are intended to drive from 4-15 LEDs at 350 mA. They can however, be easily modified to support power levels ranging from 5 W to 30 W:

  1. NCL30000LED1GEVB: 115 Vac version, 90 to 135 Vac input line (Dimmable)
  2. NCL30000LED2GEVB: 230 Vac version, 180 to 265 Vac (TRIAC Dimmable)
  3. NCL30000LED3GEVB: Extended universal version, 90 to 305 Vac

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. The NCL30000 has a low startup current of 24 micro amps (µA) (typical) and a low operating current of 2 milli amps (mA) (typical) that helps support high efficiency designs.

NCL30000 Features

  • Very Low 24 _A Typical Startup Current
  • Constant On Time PWM Control
  • Cycle−by−Cycle Current Protection
  • Low Current Sense Threshold of 500 mV
  • Low 2 mA Typical Operating Current
  • Source 500 mA / Sink 800 mA Totem Pole Gate Driver
  • Reference Design for TRIAC and Trailing Edge Line Dimmers
  • Wide Operating Temperature Range
  • No Input Voltage Sensing Requirement
  • Enable Function and Overvoltage Protection
  • These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

Other key features of the NCL30000 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. The NCL30000 is the key device in a fully tested, GreenPoint reference design for offline high power factor triac dimmable LED drivers intended for ENERGY STAR commercial and residential luminaries.

Typical Applications

  • LED Driver Power Supplies
  • LED Based Down Lights
  • Commercial and Residential LED Fixtures
  • TRIAC Dimmable LED Based PAR Lamps
  • Power Factor Corrected Constant Voltage Supplies

Packaging and Pricing

The Pb, halogen and BFR free NCL30000 is RoHS compliant and is available in an eight-pin SOIC package. It is priced at $0.45 per unit in 10,000 unit quantities. Samples are available now. Projected lead-time for production quantities is currently eight to 12 weeks after receipt of order (ARO).

News Source: ONSemiconductor News Room.