Semisouth SJEP120R100 Power Loss

[chip_mk]

Originally Posted by Nelson Pass

I forgot to ask - where did you see that in the data sheets?

Maybe it’s some mistake in the chart or it is observable only at chip temperature of 25°C.

[Zen Mod]

or is it just remaining of apple pie , which some Geek had for breakfast ..... while preparing graphs



dunno - I'll check mine in few days ....... need first to sort some other things

[spavleski]

I'll check mine again....maybe I drunk a lot of rakija and saw 0,3V instead of 0,3mV

[Zen Mod]

twice ?

that's Zenovača , for sure

[chip_mk]

Originally Posted by spavleski

I'll check mine again....maybe I drunk a lot of rakija and saw 0,3V instead of 0,3mV

Check it after cold start and once again after burning up.

[spavleski]

Originally Posted by chip_mk

Check it after cold start and once again after burning up.

My appologize.

With much more attention put now, here comes the results:

COLD Start UP - Left channel - V over R27 = 40 mV => Ig = 0,4mA
WARM - 15 min -Left channel - V over R27 = 0 mV => Ig = 0 mA

COLD Start UP - Left channel - V over R32 = 20 mV => Ig = 0,2mA
WARM - 15 min -Left channel - V over R32 = 0 mV => Ig = 0 mA

COLD Start UP - Right channel - V over R27 = 0 mV => Ig = 0 mA
WARM - 15 min -Right channel - V over R27 = 0 mV => Ig = 0 mA

COLD Start UP - Right channel - V over R32 = 0 mV => Ig = 0 mA
WARM - 15 min -Right channel - V over R32 = 0 mV => Ig = 0 mA

Seems taking rakija and measuring is not going hand by hand

Sorry again for doing first measurements without paying too much attention. Boards are not so easy accessible....

[Nelson Pass]

Originally Posted by chip_mk

Maybe it’s some mistake in the chart or it is observable only at chip temperature of 25°C.

Wow, you have sharp eyes. My sensitivity is down to
100 nA, and I don't see that for Vgs from 0 to
the value for 3A Ids, and for Vds of 0 to 40V.

In any case, even 0.4 ma looks to be a lot.

[spavleski]

Originally Posted by Nelson Pass

...
In any case, even 0.4 ma looks to be a lot.

Thanks Mr. Pass for Your kind comments.

I must take another Zenovacha and I'm shure it will come down to Zero Ohma after that. Seriously speaking , most probably it is about bad contact connection during measurements. Soon I will replace 3W resistors with a MOX type, and will take out the boards and will re-check one more time. Seems to me that really there shoudn't be a problem if some uA of Ig ig flowing. Once more time, thank You very much for a Gorgeous Amplifier made with SS Mosfets.

[spavleski]

At the moment Bias is set to Id = 1,85A and Vds = 20V with inputs grounded. Sound is

[Zen Mod]

Originally Posted by Nelson Pass

..... My sensitivity is down to
100 nA, ......