SgtWookie>> suggests using http://ww1.microchip.com/downloads/en/AppNotes/01138A.pdf or http://ww1.microchip.com/downloads/en/AppNotes/00874C.pdf.
I am not able to comprehend the definite way amongst all these deluge of info.....kindly help me out!">Dear All
Application I am intending to build - high power white LEDs for illumination in a lab envoirnment. I am using 4 Seoul P7 LEDs (data sheet attached), 4 AA batteries(1.5V each)/ 6V battery pack.
I want to have a driver for this along with a dimmer circuit such that I can control it using a pushbutton(similar to OSRAM DOT it).
The push button must be circularly moving between states -
1st state - OFF
2nd state - 25% brightness
3rd state - 50% brightness
4th state - 75% brightness
5th state - 95-100% FULL brightness
constraints include formfactor of the final PCB!
I have searched through this forum and in general on the internet and from what I have learned I could/ should/ would
> Use STMicroelectronics L5973 LED driver.
> Or some other ideas presented in the threads
http://forum.allaboutcircuits.com/showthread.php?t=13549 where the guy is using the same LEDs as me.
http://forum.allaboutcircuits.com/showthread.php?t=18860 also provides some good insight into how to go about designing it.
I need help on -
Deciding whats the best way to go about it and some handholding when I get stuck up....
I understand that PWM is the best way to acheive brightness control but then not usre how to go about combining the LED driver chip, PWM and pushbutton interface! also in one of the threads I found links to these app notes where << SgtWookie>> suggests using http://ww1.microchip.com/downloads/en/AppNotes/01138A.pdf or http://ww1.microchip.com/downloads/en/AppNotes/00874C.pdf.
I am not able to comprehend the definite way amongst all these deluge of info.....kindly help me out!
I am not able to comprehend the definite way amongst all these deluge of info.....kindly help me out!">Dear All
Application I am intending to build - high power white LEDs for illumination in a lab envoirnment. I am using 4 Seoul P7 LEDs (data sheet attached), 4 AA batteries(1.5V each)/ 6V battery pack.
I want to have a driver for this along with a dimmer circuit such that I can control it using a pushbutton(similar to OSRAM DOT it).
The push button must be circularly moving between states -
1st state - OFF
2nd state - 25% brightness
3rd state - 50% brightness
4th state - 75% brightness
5th state - 95-100% FULL brightness
constraints include formfactor of the final PCB!
I have searched through this forum and in general on the internet and from what I have learned I could/ should/ would
> Use STMicroelectronics L5973 LED driver.
> Or some other ideas presented in the threads
http://forum.allaboutcircuits.com/showthread.php?t=13549 where the guy is using the same LEDs as me.
http://forum.allaboutcircuits.com/showthread.php?t=18860 also provides some good insight into how to go about designing it.
I need help on -
Deciding whats the best way to go about it and some handholding when I get stuck up....
I understand that PWM is the best way to acheive brightness control but then not usre how to go about combining the LED driver chip, PWM and pushbutton interface! also in one of the threads I found links to these app notes where << SgtWookie>> suggests using http://ww1.microchip.com/downloads/en/AppNotes/01138A.pdf or http://ww1.microchip.com/downloads/en/AppNotes/00874C.pdf.
I am not able to comprehend the definite way amongst all these deluge of info.....kindly help me out!
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