| ??? 07/04/05 16:07 Read: times |
#96534 - Not an entirely good idea Responding to: ???'s previous message |
Hi Per,
Depending on the 'raw' input voltage, your proposed solution is not quite the best solution. While it will keep the average current through the LEDs at a constant and non-destructive level, the peak current will most probably be too high and your backlight will be destroyed anyway (or at least have a severely limited lifespan). In a lot of my designs I use National Semiconductor SimpleSwitcher ICs as voltage regulator. They are not too expensive and really easy to use. For what you describe, the LM2672 would be a good choice. NatSemi also offers an online tool to calculate the design: http://www.national.com/appinfo/power/webench/ Regards, Rob. |
| Topic | Author | Date |
| PWM - LCD backlight | 01/01/70 00:00 | |
| One Approach! | 01/01/70 00:00 | |
| Why not. | 01/01/70 00:00 | |
| Not an entirely good idea | 01/01/70 00:00 | |
| But | 01/01/70 00:00 | |
| But but | 01/01/70 00:00 | |
| hmm | 01/01/70 00:00 | |
| Apologies | 01/01/70 00:00 | |
| Buck, actually | 01/01/70 00:00 | |
| Bugger it. | 01/01/70 00:00 | |
| Bugger it | 01/01/70 00:00 | |
| Capacitor? | 01/01/70 00:00 | |
| biology | 01/01/70 00:00 | |
| Per | 01/01/70 00:00 | |
| development | 01/01/70 00:00 | |
| I got that working nicely.... | 01/01/70 00:00 | |
| Well Done | 01/01/70 00:00 | |
| what I do | 01/01/70 00:00 | |
final cut | 01/01/70 00:00 |