LU1014D curve traces

[woofertester]

I was fortunate enough to score a small handful of these devices.

Enjoy the pictures.

 

[jackinnj]

Yes they are indeed. Years ago I got quite a few and sold them to F3 enthusiasts, retaining about a dozen.

 

[EUVL]

The drain current of the two graphs differ by a factor of 10 ?


Patrick

 

[woofertester]

The drain current of the two graphs differ by a factor of 10 ?


Patrick

Yes. The first curve is intended to have a look at how the device is used in the F3.

The second curve is intended to look at using the device at lower current and higher voltage.

 

[EUVL]

Would you be kind enough to do one of the second also for the F3 current range ?
Curve taken at room temperature, in pulse mode, without heat sinking ?


Patrick

 

[woofertester]

Would you be kind enough to do one of the second also for the F3 current range ?
Curve taken at room temperature, in pulse mode, without heat sinking ?


Patrick

Will do. I have to reconfigure the equipment stack for that.

For the moment, what I am doing to fake out pulse mode is to make NPLC small. I have gone down to 0.05 NPLC which is 834 uS. Reducing points on the curve also reduces total energy. If I end up writing my own software some day, I will have a place to limit total energy per unit of time; duty cycle if you will, to approach isothermal.

 

[woofertester]

Vgs -2.3v to -1.1v in 8 equal steps. The wonky shaped curves are an interaction of the sourcemeter with the device. I tried about 20 different things none of which cured the problem. I will re-visit when I can.

Current limit was set at 1.8A

 

[woofertester]

I disconnected the computer and investigated using the front panel of the instruments.

The drain current is quite unstable when watts are being dissipated. I think that bolting this beast to a heatsink may produce better curves at greater than 10V and above 100 mA.

 

[EUVL]

You need to mount it to a big block of aluminium.


Patrick

 

[woofertester]

You need to mount it to a big block of aluminium.


Patrick

Will do. It will be a a few days before I can do that.

 

[indra1]

Remember to check for gate current leakage for Vds > 10V.