| ??? 09/03/11 12:21 Read: times |
#183612 - SOT223 will not work at all! Responding to: ???'s previous message |
Raj said:
I do not have space for heatsinking pad/Plane on the PCB... 1,3W cannot be handled with a SOT223 package unless you have special heat dissipation planes and lots of thermal vias. Without any pad/plane the LM1117's temperature will rise up to about 140K/W * 1.3W = 180K over ambient temperature!!! So, go for the TO220 package and mount it onto a proper heatsink. Look for another manufacturer of LM1117 to save cost. ST has a cheaper one, the LD1117. Kai Klaas |
| Topic | Author | Date |
| LM 1117 SOT 223 - Heatsinking | 01/01/70 00:00 | |
| Tight Suggestion | 01/01/70 00:00 | |
| I hate to change it, but | 01/01/70 00:00 | |
| Price Competition | 01/01/70 00:00 | |
| Price competition? | 01/01/70 00:00 | |
| Depends | 01/01/70 00:00 | |
| Switcher | 01/01/70 00:00 | |
| Switchers... | 01/01/70 00:00 | |
| LM1117 is an LDO | 01/01/70 00:00 | |
| 5V -> 3.3V | 01/01/70 00:00 | |
whoops | 01/01/70 00:00 | |
| LDO in HDO Application | 01/01/70 00:00 | |
| SOT223 will not work at all! | 01/01/70 00:00 | |
| "A Proper Heatsink" Indeed | 01/01/70 00:00 | |
| heat spreader | 01/01/70 00:00 | |
| LD1117 | 01/01/70 00:00 | |
| Alternative to LD1117 | 01/01/70 00:00 | |
| The LV33 can only deliver 500mA | 01/01/70 00:00 | |
| Current rating of LF33CV | 01/01/70 00:00 | |
| LD1086DT33 | 01/01/70 00:00 |