NUD4001 & NUD4011 LED Drivers

NUD4001 & NUD4011 LED Drivers from ON Semiconductors seem too easy to use when all others are using Buck-Topology ICs with Inductors, Capacitors, Resistors & MOSFETs.

https://www.onsemi.com/PowerSolutions/product.do?id=NUD4011

Need advices on these 2 ICs, Pro & Cons. Thank you very much.

the 4011 looks like an adjustable shunt regulator to me, such a low current is the dead giveaway ... keep in mind, the "other" led drivers with inductors and what-not are primarly designed for high-brightness leds, requiring 100's if not 1000's of mA to operate. Trying to regulate a 3 amp luxeon III array using a linear regulator is an exercise in pain

the 4001 is just a lower voltage version, and the trade off is, it can handle more current ... paralleling devices is interesting. I bet the part still gets warm under a heavy load!

Thank you JustDIY
My load is a cluster of White LED x 24, Vf=3V, If=20mA with AC120V as Vin. Need to figure out a simplier way of driving these LEDs, never used NUD4xxxx before and try to avoid high component counts, ie. Buck-Topology if I can.

yea, a high voltage shunt regulator is the perfect fit for this application.

just make sure you give those little so8 chips a big copper pour as a heatsink.

Will put in 2-in square 2 oz copper as heatsink.
Thank you JustDIY