jano2358
Newbie level 4
hi!
I'm making a buck-boost converter with three parts: +12V, +5V and -12V (all at 1A), right now it's working but I want to increase the efficiency, particularly in the negative side where the measurements show 84% at 1A and the IC wants to rise up to 100ºC+
in this one, for the output filter I choose a parallel of three low esr tantalum (22u) and two ceramic caps (10u X5R, which becomes 3u for 12V)
in the datasheet and simulators the suggested compensation network is type III in case of ceramic and type II in case of tantalum, which one should I use?
it's a good choice to mix capacitor types at the output? I did that to have more current capacity and save some cost
I have 43% of duty cycle in the coil, it's is a good number? it's possible to cut this a bit somehow?
Thanks in advance!
I'm making a buck-boost converter with three parts: +12V, +5V and -12V (all at 1A), right now it's working but I want to increase the efficiency, particularly in the negative side where the measurements show 84% at 1A and the IC wants to rise up to 100ºC+
in this one, for the output filter I choose a parallel of three low esr tantalum (22u) and two ceramic caps (10u X5R, which becomes 3u for 12V)
in the datasheet and simulators the suggested compensation network is type III in case of ceramic and type II in case of tantalum, which one should I use?
it's a good choice to mix capacitor types at the output? I did that to have more current capacity and save some cost
I have 43% of duty cycle in the coil, it's is a good number? it's possible to cut this a bit somehow?
Thanks in advance!