You could try an SB540. It is a 5 amp continuous
The next step is a TO220 package
.http://www.mouser.com/ds/2/115/ds23024-82866.pdf

 

You could try an SB540. It is a 5 amp continuous
The next step is a TO220 package
.http://www.mouser.com/ds/2/115/ds23024-82866.pdf

Thanks, so far increasing the RPM and P gain helped alot.
I will get geared motors soon.

Regards

 

Hi guys. High speed movement works but at any start or low speed movement and the diode ignites a bit.
So please help me chose better diode. I decided to go with TO220 and i found a lot of diodes in 10-20A range.
For example MBR1635G
One thing that puzzles me now is this forward voltage which is about 0.5V. Help me out. is this relevant for H-bridge schotky diodes.
BTW which is more important for this application, peek repetitive current or rated current?

Thanks alot.

Regards

 

Stupid question, i think i just realized what is forward voltage, a voltage drop across diode?

Still im wondering which is more important for this application, peek repetitive current or rated current?

 

Yes, It is just the drop across the diode, but will be useful in seeing how much power is wasted in it so you can determine how large the heat sink must be.
Both numbers are important. Lets say your motor is 10 amps maximum when stalled. If you had a duty cycle of say 99% all of that current will go thru the diode when you turn it off for the 1% time. So 10 amps but only for 1% of the time so the average is very low. But when the motor is running at say 50% at 10 amps the average will be 5 amps.
That looks like a pretty good diode. Use a small heat sink.

 

Thanks

 

Hi guys, i analysed the problim a bit more. The 3A diodes survived. it was the experimental PCB solder and paperclip Leads that get red hot and glow out. Probably too high current for too long. What to do here. double the leads?