Hi everyone,
I designed the schematic of a switcher with following characteristics:
Input voltage: 40-84V
Output voltage: 24V
Output current: 0-4A*
It goes from 100mA to 4A continuously and that's what bothers me!!
Please find my schematic below.
I've designed the circuit using Webench and datasheet example and I am concerned about discontinuous current mode and efficiency at light load(~100mA). I know that at this power stage switcher is only as good as it's layout, but unfortunately I don't have the layout yet. What could go wrong at light load and how to prevent that?
- One question more regarding the input capacitors, Webench could not suggest me any useful input capacitor so I've decided to use 47uF Organic Aluminum Capacitor(lower ESR than usual Aluminum Electrolytic) in parallel with 100nF and 1uF(not shown on schematic). Would that be enough?