Hi team,
Could you go over if the design procedure is correct?
| Rain Name | VCCCIN_CPU | - |
| Vin | 12 | V |
| Vout | 1.8 | V |
| fs | 900 | kHz |
| #PH | 2 | - |
| L | 0.22 | uH |
|
RCS (R sensing topology) |
0.5 | mOhm |
| Target ICCMAX | 50 | A |
1.
RIMAX = 100kOhm to set fs as 900kHz from table 8 in DS
RF = 25kOhm to set ICCMAX in equation (5) in DS
2.
Set I_OCP in equation (16) as 50*1.5=75 (ICCMAX with 50% margin)
EQ (16) : I_VALLEY = (75 / 2ph) - 0.5* (((12V-1.8V)*1.8V)/(12V*900kHz*0.22uH*2ph)) = 35.5681...A
EQ (15) 35.5681A* 0.5mOHM = VCS(OCP) = 17.78mV
So choose ROCP as 56kOHm from table 11 in DS (select the next higher setting.)
3.
Lastly, set RIMON as 324.8kOhm using equation (29)
1.7 = 10 * (1+RIMON/56kOhm) * 0.5mOhm * 50A
I need your urgent review on this so that I can confirm the customer.
Thanks,
