Tool/software:
I'm using a TPSM560R6H in the Inverting Buck Boost topology per app note snva962. This app note, and several others pertaining to IBB topology, recommend placing a Schottky diode between -Vout and SYS_GND:
"When VIN is applied to the circuit, this dV/dt across CBYP creates a current that must
return to ground to complete the loop. This current might flow through the internal low-side body diode of the
MOSFET and inductor to return to ground. For this case, it is recommended to have a Schottky diode between
–VOUT and SYS_GND..."
For this topology, the newer modules don't seem to be supported on WEBENCH yet but other IBB WEBENCH designs use either a 40V, 1A or a 60V, 3A Schottky. Apart from being able to hold off the potential between GND and -Vout, I assume it just needs to be rated for the current required to charge CBYP. Is there an easy way to estimate this value? Are there other considerations that I'm missing?
