Hello, I have some questions regarding a project I'm working on.
Whats the recommended way to cool this LM1084 5A regulator? https://www1.elfa.se/data1/wwwroot/assets/datasheets/hrLM1084_data_e.pdf
I have these TO220 heatsinks http://www.fischerelektronik.de/uploads/pics/FK252gr_01.jpg but it seems that I need active cooling as well if I'm using the regulator to its full potential. However I have no experience in designing active cooling. Fan types, placement etc. There are some graphs with temperature shown in the LM1084 datasheet but I dont know what to make of them.
So the longer question. I'm designing a PIC controlled battery charger for lithium ion batteries and just want some general feedback on it. Actually it will have more functions than charging, including destructive stress testing which is why I need all the current. I have succesfully used this little guide to create a D/A converter for my PIC http://www.edn.com/design/analog/4363990/Control-an-LM317T-with-a-PWM-signal
The ciruit I have is this, simplified a bit to capture the essentials:
The PIC controls for example the current with a feedback loop, mesuring current using Ai0:
PWM_new = PWM_old - Measured_Current + Target_Current
So in general, what stupid mistakes have I made? What would you do differently?
Whats the recommended way to cool this LM1084 5A regulator? https://www1.elfa.se/data1/wwwroot/assets/datasheets/hrLM1084_data_e.pdf
I have these TO220 heatsinks http://www.fischerelektronik.de/uploads/pics/FK252gr_01.jpg but it seems that I need active cooling as well if I'm using the regulator to its full potential. However I have no experience in designing active cooling. Fan types, placement etc. There are some graphs with temperature shown in the LM1084 datasheet but I dont know what to make of them.
So the longer question. I'm designing a PIC controlled battery charger for lithium ion batteries and just want some general feedback on it. Actually it will have more functions than charging, including destructive stress testing which is why I need all the current. I have succesfully used this little guide to create a D/A converter for my PIC http://www.edn.com/design/analog/4363990/Control-an-LM317T-with-a-PWM-signal
The ciruit I have is this, simplified a bit to capture the essentials:
The PIC controls for example the current with a feedback loop, mesuring current using Ai0:
PWM_new = PWM_old - Measured_Current + Target_Current
So in general, what stupid mistakes have I made? What would you do differently?