Hello team,
I have a support request regarding the LM5175PWP, the application is question is using the Input Capacitor configuration seen on Page 10 of LM5175EVM-HP's User Guide, including C1, a 180 µF Polymer Aluminum Electrolytic Capacitor. My guess is that LM5175EVM-HP uses that the 180 µF Electrolytic Capacitor is the Bulk Capacitor used set to support the max. current going through the input capacitors based on what I saw in Section 9.2.2.6 of the LM5175 datasheet.
Also, as a note... WEBENCH® suggests using (1) Bulk Capacitor of 68 µF, and (6) Ceramic 4.7 µF capacitors.
Questions:
- How was the 180 µF Bulk cap (C1) selected in LM5175EVM-HP?
- Could this application just use four (4) Ceramic capacitors and one (1) General Purpose Bulk capacitor?
If so, what would be the tradeoff? - What would the minimum value be for the Bulk capacitor?
Application Details:
Input: VIN(MIN) = 6 V, VIN(MAX) = 36 V
Output: VOUT = 12 V, IOUT(TYP) = 2 A to 3 A, IOUT(MAX) = 5 A (versus the up to 10 A the HP EVM supports)
Thanks,
Victor S.