Other Parts Discussed in Thread: LM3429, TPS92692
I am having trouble designing LED Boost driver using LM3429.
Since it is being used for automotive applications, the input voltage is 9 - 16V and the output current set to be 0.65A.
However when calculating the capacity of the output capacitor using the formula specified in the datasheet which is Co = Iled x D / (rd x delta(Iled-pp), the capacitance is over 1 Farad.
Values are used 0.65A for Iled, 0.75 for D, rd = 7.2 ( leds - 1.2ohm each, total 6 leds) and the delta(Iled-pp) - 50mA - 0.05A and the result is 1.35 Farad.
Using such capacitor or capacitor bank is illogical.