Hello All,
This is my first project connected with DC/DC converters. Therefore all kind of remarks will be appreciated.
I have to design buck-boost converter (inverting configuration) meeting following requirements:
U in_min = 6V
U in_max= 36V
Uout = - 5V
I out_min = 28 mA
I out_max =1A
I out_typ = 100-200mA
Moreover an important issue is also converter footprint. It have to be as small as possible.
I tried to use WEB BENCH and SWITCHER PRO software. Once the input data is processed WEB BENCH gives only two possible solution with LM5576 & LM25576.
In SWITCHER PRO I can't define output voltage with value less than 0. It looks like inverting configurations aren’t implemented . Is that right ?
Any way I found some IC form TI side, which may meets requirements - TPS54260. In datasheet is showed that it can be used in inverting configuration. It have also small footprint.
I also found application note SLA317a and excel used to calculate parameters values for this IC.
There are few questions which I have at this stage of design :
1.Are there any difference in operating between LM5576 & TPS54260 working as buck- boost converter ( taking my requirements into account) ?
2. Does anyone have experience with TPS54260 as buck-boost converter , with similar specification?
3. What else design support I can get beside SLA317 application note? Do you know why WEB BENCH doesn't include this solution?
4. What about evaluation board for buck-boost converter? Can I use standard board for TPS54260 and just switch the output signals (OUT to GND, GND to OUT).