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.