| ??? 12/01/05 16:18 Read: times |
#104511 - If you are ready to redesign... Responding to: ???'s previous message |
K.ganeshan said:
Of course the easy way is to tell the customer that solution is not feasible. But is there another way? Yes, but you must redesign your application: First, 24VDC must be converted to 5V, to supply your micro board. This should be done by the help of a switcher to keep the heat dissipation low. Here a LM2674 can be used. This amazing chip shows a huge efficiency and brilliant performance. I use it a lot. Then, remove these stone-old MC1488/9 and choose modern RS232 transcievers working at only +5V. Choose a derivative only needing extremly low supply current. Now, only a simple and low current consuming galvanic isolation between the +5V of micro and the two +5V of RS 232 transcievers is needed. This can be done by two MAX253 in combination with two simple and tiny transformers, for instance. Or you can drive each transformer by a simple NE555, providing some less efficiency, of course. Extra costs of this solution are much less than 3 x 15 UD! Kai |
| Topic | Author | Date |
| DC to DC converter | 01/01/70 00:00 | |
| Power Trends | 01/01/70 00:00 | |
| Switching regulators | 01/01/70 00:00 | |
| Traco | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| Additional pi-filters are often needed! | 01/01/70 00:00 | |
| the frequency is high | 01/01/70 00:00 | |
| main point: low pass filter | 01/01/70 00:00 | |
| the crux | 01/01/70 00:00 | |
| Of course! | 01/01/70 00:00 | |
| switching frequency? | 01/01/70 00:00 | |
About 100kHz | 01/01/70 00:00 | |
| Volume Vs Cost debate | 01/01/70 00:00 | |
| decisions, decisions | 01/01/70 00:00 | |
| If you are ready to redesign... | 01/01/70 00:00 | |
| Kai, when recommending things like this, | 01/01/70 00:00 | |
| Datasheet... | 01/01/70 00:00 |