I'm trying to build a controllable switch for a heavy load (3D printer), controlled by a microcomputer.
I don't want to use relay because of slowness, sound and durability. So I've built a switch based on MOSFET IRLB3034 datasheet.
The main issue is, the transistor getting more than 150 °C after 20 sec of working at full power.
- Vgs = 4.5v or even 11v (that makes no difference) of constant DC
- Vds = 1v and rising
- Current is about 15A (max of power supply is 20A)
What could be my possible mistake?