| ??? 01/27/06 15:05 Read: times |
#108517 - there is an alternative, search for it Responding to: ???'s previous message |
I don't like Darlingtons very much, because of their rather high collector emitter saturation voltage. This can result in some unsane heat dissipation.
From the days I did such stuff, I seem to recall that there is an ULN look-alike where the "darlington input stage" use a separate collector supply (with a resistor, of course) bringing the VceSat down to the one transistor value. Do I even recall tyhe manufacturer, sorry no. I hope that bringing up the existence of the part will make someone remember the designation for the benefit of Abdul et al. Erik |
| Topic | Author | Date |
| Relay board diagram | 01/01/70 00:00 | |
| Just search for, "Relay" !! | 01/01/70 00:00 | |
| andy Neil | 01/01/70 00:00 | |
| Relay ratings | 01/01/70 00:00 | |
| ULN2803,ULN2003 | 01/01/70 00:00 | |
| more on relay ratings | 01/01/70 00:00 | |
| Yes of course | 01/01/70 00:00 | |
| internal diodes | 01/01/70 00:00 | |
| ULN2003's doesn't easily burn | 01/01/70 00:00 | |
| Uce saturation voltage is rather high | 01/01/70 00:00 | |
| there is an alternative, search for it | 01/01/70 00:00 | |
| I agree | 01/01/70 00:00 | |
| That is bad design | 01/01/70 00:00 | |
| ULNs resist more... | 01/01/70 00:00 | |
| I would never suggest 74HC buffers for d | 01/01/70 00:00 | |
| Yes , you didn't | 01/01/70 00:00 | |
| I would like to see where that is, pleas | 01/01/70 00:00 | |
correct link | 01/01/70 00:00 | |
| Bad Design? | 01/01/70 00:00 | |
| naah | 01/01/70 00:00 | |
| Also depends on transistor speed | 01/01/70 00:00 | |
| valid issue, but not that, now another | 01/01/70 00:00 | |
| Indeed | 01/01/70 00:00 | |
| Serial | 01/01/70 00:00 | |
| How much current? | 01/01/70 00:00 | |
| allegro | 01/01/70 00:00 | |
| and infineon | 01/01/70 00:00 |