I'm trying to put together a boost converter to take a 11-14.4v input and boost it to ~17v with a max current of 2A.
Most of my designs (made either by calculations done by me or a calculator tool from the web, all of which have actually given me different values) work fine at low loads (~100-150 mA), but the voltage drops off quite quickly as I increase the load and I just get a small ripple followed by a flat voltage somewhere below 12v after about 300mA upwards.
I've made the circuit physically once, but now I am using LTspice to simulate it.
I'll be using a 100KHz switching frequency (LM2585T-ADJ) and the online calculators I've used have said to use: Min 64uH inductor with 38% duty cycle (http://www.coilcraft.com/apps/selector/selector_2.cfm) Min 6.28uH inductor with 15-35% duty cycle(https://learn.adafruit.com/diy-boost-calc/the-calculator)
EDIT: Good point about the schematics, don't know why I didn't include them straight away.