Abstract
This chapter examines the advantages and disadvantages of the various driver techniques. The issues of efficiency, EMI, cost and other requirements that are additional to the basic function of the LED driver. A linear LED driver is generally less efficient than a switching driver. Sometimes a linear driver can be more efficient. Switching power supplies have the disadvantage of producing electromagnetic interference (EMI). EMI must be limited, to prevent interference with other systems. Conversely, where EMI requirements are very demanding, such as medical and automotive applications, linear LED driver techniques can be used instead. Transformer coupled switching regulators can be designed for a very wide range of supply and output voltages. The most common is a fly-back converter, although forward converters are also popular in higher power applications. Fly-back converters have the advantage of stepping up or down the output voltage compared with the supply.
Published Version
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