| ??? 05/01/11 08:42 Read: times |
#182138 - Formula and parentheses Responding to: ???'s previous message |
Richard Erlacher said:
The NSC-recommended value (from and old app-note) was 6000 uF/volt-of-ripple/ampere of current, [...] That formula wasn't so easy to read. Normal evaluation rules would be to perform division from left to right, so (600uF/ripple)/current. That would imply that the cap can be smaller when more ripple is accepted. But it would also imply that the cap can be smaller for higher current - while higher current gives larger ripple... d eath through the cap faster. So then we end up with 6000uf/(ripple/current) which is not the left-to-right evaluation order, and often rewritten 6000uf*current/ripple. People should really not chain multiple division operators after each other without parentheses. |
| Topic | Author | Date |
| LDO/Capacitor | 01/01/70 00:00 | |
| It seems... | 01/01/70 00:00 | |
| there's an old "standard" ... | 01/01/70 00:00 | |
| Any other LDO | 01/01/70 00:00 | |
| LP38502, LP38692, ... | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| Formula and parentheses | 01/01/70 00:00 | |
| You're right, but that wasn't the point | 01/01/70 00:00 | |
| Did you actually read? | 01/01/70 00:00 | |
| I did read it, but incorrectly | 01/01/70 00:00 | |
Easy to go wrong with multiple divisions | 01/01/70 00:00 |