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Power Supplies for LED Driving by Steve Winder

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CHAPTER 6 Boost Converters

Boost converters (see Figure 6.1) are ideal for LED driver applications where the LED string voltage is greater than the input voltage. Normally, a boost converter would only be used when the output voltage minimum is about 1.5 times the input voltage.

The converter can easily be designed to operate at efficiencies greater than 90%.
Both the MOSFET and LED string are connected to a common ground. This simplifies sensing of the LED current, unlike the buck converter where we have to choose either a high side MOSFET driver or a high side current sensor.
The input current can be continuous, which makes it easy to filter the input ripple current and thus easier to meet any required conducted EMI standards.

Figure ...

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