ON Semiconductor introduces LED lighting chipset

by K C Krishnadas, TechOnline India - November 29, 2011

Two new devices help designers optimize solutions for a wide range of LED applications

ON Semiconductor has introduced two new LED drivers to help designers optimize their solutions for automotive, industrial and general lighting applications. Its new NCL30051 stage, power factor correction (PFC) and Resonant Half Bridge, LED driver combined with the new NCL30160, a dimmable constant current step-down (buck) LED driver, provide a solution for high-brightness LED driver applications where space is limited and high efficiency is important.

The NCL30051 is a dedicated LED power supply IC capable of delivering a constant voltage to a step-down DC-DC converter/LED driver (e.g. NCL30160). It combines a critical conduction mode (CrM), PFC controller and a half-bridge resonant controller with a built-in 600 volt (V) driver and is optimized for off-line power supply applications - all the features needed to implement highly efficient, small form factor designs. The NCL30051’s half-bridge stage operates at a fixed frequency. Regulation is achieved by adjusting the PFC stage output voltage. The device integrates open feedback loop protection, plus PFC overvoltage and undervoltage detection mechanisms, as well as an adjustable frequency oscillator which can be set at up to 75 kilohertz (kHz). 

The NCL30160, a switching regulator for high power LEDs, takes the constant voltage delivered by the NCL30051-enabled power supply and steps down the voltage to provide a constant current across the LED string.  Solutions with up to 98 percent efficiency are achieved by utilizing the low 55 milliohm (mΩ) internal MOSFET and the ability to operate at 100 percent duty cycle. This constant current device operates with an input voltage range from 6.3 V to 40 V, which makes it ideal for industrial and automotive applications.  High switching frequencies up to 1.4 megahertz (MHz) allow the use of smaller external components helping to minimize board size and cost.

 “The NCL30051 and NCL30160 ICs work in tandem to simplify power circuit designs with the minimal number of external components needed. This architecture allows the chipset to be incorporated into more compact and cost-effective LED Lighting power supplies for general lighting applications such as outdoor lighting forstreet lights and parking lights, and automotive lighting,” said Bill Schromm, ON Semiconductor senior vice president and general manager of Computing and Consumer Products.

Both the NCL30051 and the NCL30160 have operating junction temperature ranges of -40 ⁰C to +125 ⁰C.
 
 

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