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step down current source

Other Parts Discussed in Thread: TPS62150, LM3402, TPS92513

Frequently we have to connect an high bright led to a power source fo example 12VDC.

An analog current source will not do well in this situations, consuming lots of power.

Therefore I like to have a simple switching power source based on a step down topology.

I'm sure it has been done already but I just cannot fount practical examples or circuit diagrams.

This time my powwer supply is 12VDC , the led has an current consumption of 150mA and a Fv of 2.6 Volts.

Could somene help out ?

Best regards

Robert Dugour