Other Parts Discussed in Thread: PMP21251, , UCC28056, UCC256404
Hi there,
I'm working on a new design with the UCC256304 following up the UCC28056 (very similar to the PMP21251 reference design, but with increase power load). I've been trying to use the datasheet, design calculator, and reference design to compare values to make sure my calculations are sane and have been running across a few confusing points.
1. ISNS Pin Differentiator
The application information says
I believe this should be "The threshold voltages are 4V, 0.8V, and 0.6V respectively"
2. VCR Pin Capacitor Divider
What is Icomp here? Is this Iramp? According to the design calculator, it seems like it references Iramp, but I can't find other mention of Icomp in the datasheet.
3. BLK Pin Voltage Divider
Why is 120V used here? It seems to also be referenced in the design calculator, but in the PMP21251 schematic R229 is 44.2kohms which would suggest that the numerator for the kBLK calculation is actually 340.
Thanks!
Tyler
