ENERGY AMPLIFICATION

[forest]

I think the answer may be the statement from datasheet :   Repetitive Avalanche Allowed up to Tjmax
I had to place it on radiator and now it runs cold.
Attached actual circuit with the freewheeling diode which seems to suck current from battery (12V7Ah)

[forest]

Hope this helps out a bit....

Take care, peace
lost_bro

Thank you lost_bro. You are my bro 

[MarkE]

I think the answer may be the statement from datasheet :   Repetitive Avalanche Allowed up to Tjmax
I had to place it on radiator and now it runs cold.
Attached actual circuit with the freewheeling diode which seems to suck current from battery (12V7Ah)

If you use a crummy diode and switch too many times per second then the charge recovery from the diode will be a problem.

What is the switching frequency?

What diode are you using?

[forest]

If you use a crummy diode and switch too many times per second then the charge recovery from the diode will be a problem.

What is the switching frequency?

What diode are you using?

I'm not using diode, I only pointed that placing that diode as shown in Fig 12a in datasheet has no merit for circuit working, no change also in scopeshot. Adding freewheeling diode as I said in previous post rises current to 4A. I drive circuit with 15us pulses squarewave.

[MarkE]

I'm not using diode, I only pointed that placing that diode as shown in Fig 12a in datasheet has no merit for circuit working, no change also in scopeshot. Adding freewheeling diode as I said in previous post rises current to 4A. I drive circuit with 15us pulses squarewave.

The diode in Fig 12A protects the right hand MOSFET.  No right hand MOSFET means that the diode doesn't do anything.

If you have a good diode correctly oriented then it recirculates the current around the coil when the MOSFET is off.  If you have a crummy diode then it will suffer lots of shoot though current when the MOSFET turns on.  If the diode is backwards it will conduct straight into the MOSFET when the MOSFET turns on.  Most simple relay and solenoid drivers use a clamp diode without any trouble at all.  Your experience getting a high current means something is not as you describe it.  You've got a junk diode, or its wired backwards from the way you think, or your diode is blown, or you are operating it past its breakdown voltage.