| ??? 05/09/08 07:13 Modified: 05/09/08 07:15 Read: times |
#154614 - My doubt is only on choosing Hfe.. Responding to: ???'s previous message |
Thats why i didnt give importance to Motor specification here.
Stefan Kanev said:
with this transistor - use at least 0.6A for calculations Suresh said:
In electrical charactesistics it shows Hfe decreases for increase in collector current -> Hfe = 15 for IC = 1A.
-How does it decrease with increase in Ic? while the base current remains constant -Added Secondly, in Hfe Vs Ic graph(Page2) Hfe for 1A is shown as 64 (approximately) which is not the same as in Electrical characteristics? Using MOSFET would be a better solution and i can try that next. But iam interested in finding the answers for the questions i have, on the method i approached. Suresh. |
| Topic | Author | Date |
| Clarification on choosing Hfe | 01/01/70 00:00 | |
| search again | 01/01/70 00:00 | |
| Its max current is 0.6A | 01/01/70 00:00 | |
| so if You continue playing .. | 01/01/70 00:00 | |
| My doubt is only on choosing Hfe.. | 01/01/70 00:00 | |
| read again | 01/01/70 00:00 | |
| Any hfe will work | 01/01/70 00:00 | |
| Exactly! | 01/01/70 00:00 | |
| How driving it? PWM or ON/OFF? | 01/01/70 00:00 | |
| PWM and ON/OFF | 01/01/70 00:00 | |
| Use a MOSFET | 01/01/70 00:00 | |
| See the typical transistor curves | 01/01/70 00:00 | |
| Here comes the spoon... | 01/01/70 00:00 | |
| You replies are clear.. | 01/01/70 00:00 | |
| Higher heat dissipation | 01/01/70 00:00 | |
Thank You! | 01/01/70 00:00 |