777funk
Newbie level 6
I have PWM running a solenoid at approx 3.5V from 10-12V DC as a reference. I have a SMT MOSFET (IRLML6246TRPBF) rated at 20V and 4.1A driving the solenoid (measures 6 ohms).
Here's something I know nothing about and have two questions.
1. If I don't have the flyback diode in circuit (parallel with the solenoid) I get a voltage but as soon as I connect the solenoid load it drops to almost Zero. If I have the diode in circuit it works perfectly and holds proper voltage. Not sure why this is?
2. When I touch the diode after a set time it feels HOT to the touch. I'm guessing around 130F. Why would this be? I'd think at pulsed 3.5V and with a 6ohm load I'd have around 0.5Amps. The diode is a 1N4002 which is rated at 1A. Why is it getting hot? Am I missing something or does the pulsed voltage change the calculations?
thanks for any ideas here.
Here's something I know nothing about and have two questions.
1. If I don't have the flyback diode in circuit (parallel with the solenoid) I get a voltage but as soon as I connect the solenoid load it drops to almost Zero. If I have the diode in circuit it works perfectly and holds proper voltage. Not sure why this is?
2. When I touch the diode after a set time it feels HOT to the touch. I'm guessing around 130F. Why would this be? I'd think at pulsed 3.5V and with a 6ohm load I'd have around 0.5Amps. The diode is a 1N4002 which is rated at 1A. Why is it getting hot? Am I missing something or does the pulsed voltage change the calculations?
thanks for any ideas here.