Thankfully, the datasheet has all the instructions and equations required. Taken from the AL8853 Datasheetĭesigning switching converters is hard. We chose the AL8553 because it has an external MOSFET, It's small, inexpensive, has good integrated over-current and over-voltage protections, supports dimming control through PWM, and comes in a leaded IC package (important for ease of soldering). Also, since our power source is a 3S Lipo battery, we need a BOOST driver, as the voltage provided by the battery 11.1v will need to be stepped up to the voltage required by the LEDs. This post goes through the calculations needed to design the circuit, the following post gives some recommendations on designing the PCB.Īccording to our calculations, to achieve max brightness we need a driver capable of providing 1Amp 26.4V (the combined forward voltage of 6 ls). It is now time to design a driver to power them. Having previously decided which, and how many, LEDS we are going to use.
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