I need a power supply that delivers 12v with an input between 8v and 35v. That's the reason I bought a couple of TPS55165Q1 from Texas instruments. I've made 3 different PCBs with a similar circuit. All of them works great in buck mode, delivering 12v up to 500mA. When I change to boost mode, It does not deliver neither the current or voltage it was calculated. When I switch to low-power mode, it works just as expected in buck and boost mode. That's why I conclude that there is a protection thats working (in Low Power mode, all protections are disabled). I've tried to emulate as close as possible the circuit of Figure 3 of its evaluation board: http://www.ti.com/lit/ug/slvuay1/slvuay1.pdf
I show you
I've chosen SRU1048-4R7 inductor from Digikey and take special care of its Rdc and peak current. All capacitors are ceramic except for the 100uF. Can you give me some advice in order to get it work? Thanks!