So im using the IRLB8721PbF. Which is rated at 30v at 60 amps.
I'm trying to make a laser harp which is using a homemade experimental galvo. All I use is a permanent magnet on a shaft and a electromagnet that has a resistance of around 3 ohms. So, theoretically, it should draw around 4 amps max at 12v, right?
That's well within spec of this fet. So it shouldn't be getting redicuosly warm. I do have a flyback diode in parallel with the EMagnet also. I guess if that wasn't there though, the mosfet would just instantly die.
I am PWMing this mosfet too at the atmega328 standard 980hz for position of the "galvo".
My power supply can supply 18 amps btw. So even if my calculations we're wrong, there still isn't enough power to blow it.
If anyone can help me figure out why this is heating up so fast, I would appreciate it
Thanks!
Data sheet:
https://www.google.com/url?sa=t&sou...ggnMAA&usg=AFQjCNERh-LqA_v0gglX6XTKE2QADjgqrw
I'm trying to make a laser harp which is using a homemade experimental galvo. All I use is a permanent magnet on a shaft and a electromagnet that has a resistance of around 3 ohms. So, theoretically, it should draw around 4 amps max at 12v, right?
That's well within spec of this fet. So it shouldn't be getting redicuosly warm. I do have a flyback diode in parallel with the EMagnet also. I guess if that wasn't there though, the mosfet would just instantly die.
I am PWMing this mosfet too at the atmega328 standard 980hz for position of the "galvo".
My power supply can supply 18 amps btw. So even if my calculations we're wrong, there still isn't enough power to blow it.
If anyone can help me figure out why this is heating up so fast, I would appreciate it
Thanks!
Data sheet:
https://www.google.com/url?sa=t&sou...ggnMAA&usg=AFQjCNERh-LqA_v0gglX6XTKE2QADjgqrw