That is low:
http://www.diyaudio.com/forums/class-d/237086-tpa3116d2-amp-744.html#post4368854
Idle inductortemp measured in 3251 thread I believe was very high too. more than 15 above room if I remember correctly, but doctormord did that heatphotograph too I believe
http://www.diyaudio.com/forums/class-d/237086-tpa3116d2-amp-744.html#post4368854
Idle inductortemp measured in 3251 thread I believe was very high too. more than 15 above room if I remember correctly, but doctormord did that heatphotograph too I believe
If measurements are comparable the Sanwu looks very good, idle, equals 20V filterless in table.
For the 3251 idle, main cause of heat was the Coilcraft inductors, if I remember correctly. Temperatures at high output were the same or even dropped in inductors, I don't remember clearly, but the photos reminded me of YJblueblack and also earlier in 3116 thread I think xrk replaced inductors on Ybdz? for Coilcrafts that also run warm idle, so I wouldn't think of Coilcraft to improve an ampboard. The Coilcraft inductors might not be very suitable for classD?
For the 3251 idle, main cause of heat was the Coilcraft inductors, if I remember correctly. Temperatures at high output were the same or even dropped in inductors, I don't remember clearly, but the photos reminded me of YJblueblack and also earlier in 3116 thread I think xrk replaced inductors on Ybdz? for Coilcrafts that also run warm idle, so I wouldn't think of Coilcraft to improve an ampboard. The Coilcraft inductors might not be very suitable for classD?
My Ybdz is the coolest idle board. No sign of any warmth at all on anything.
My YJ blue black was the hot idler. Changing to coilcraft did not help.
I suspect it is some sort of residual self cancelling output at idle that makes these warm but they are in spec.
I wonder what Ybdz does right to keep it cool?
My YJ blue black was the hot idler. Changing to coilcraft did not help.
I suspect it is some sort of residual self cancelling output at idle that makes these warm but they are in spec.
I wonder what Ybdz does right to keep it cool?
TPA3118D2
It was not because the Coilcrafts in general but because the construction of the inductors + additional heat from the 3251. So different brand, same construction will result in same temps. Maybe soft saturation cores perform different.
Warm inductors wouldn't indicate a bad thing here. Again, it's not a brand specific "problem" but the way the inductor is made. (And 3251 is different modulation, AD is always higher idle loss)
But yes, the MSS series is introducing more distortions than I.e. the ICE (class-d) inductors. (MSS is not specially made nor optimized for class-d but for switching regulators)
Those ICE are optimized for class-d as some Coilcraft series are as well, so one can't say Coilcraft is bad and ICE is good.
xrk, which Coilcraft series/model did you tested?
It was not because the Coilcrafts in general but because the construction of the inductors + additional heat from the 3251. So different brand, same construction will result in same temps. Maybe soft saturation cores perform different.
Warm inductors wouldn't indicate a bad thing here. Again, it's not a brand specific "problem" but the way the inductor is made. (And 3251 is different modulation, AD is always higher idle loss)
But yes, the MSS series is introducing more distortions than I.e. the ICE (class-d) inductors. (MSS is not specially made nor optimized for class-d but for switching regulators)
Those ICE are optimized for class-d as some Coilcraft series are as well, so one can't say Coilcraft is bad and ICE is good.
xrk, which Coilcraft series/model did you tested?
Last edited:
It was not because the Coilcrafts in general but because the construction of the inductors + additional heat from the 3251. So different brand, same construction will result in same temps. Maybe soft saturation cores perform different.
Warm inductors wouldn't indicate a bad thing here. Again, it's not a brand specific "problem" but the way the inductor is made. (And 3251 is different modulation, AD is always higher idle loss)
But yes, the MSS series is introducing more distortions than I.e. the ICE (class-d) inductors. (MSS is not specially made nor optimized for class-d but for switching regulators)
Those ICE are optimized for class-d as some Coilcraft series are as well, so one can't say Coilcraft is bad and ICE is good.
xrk, which Coilcraft series/model did you tested?
More info here:
http://www.diyaudio.com/forums/class-d/237086-tpa3116d2-amp-387.html
MSS1583-103MEB was what I used.
Well, when saying, those Coilcrafts add more distortion, it's not like they perform really bad but there are others which perform better.
If i remember the measurements from 5th element correctly, we were comparing 0.1% vs. 0.02% (above 10kHz) at higher levels or so. Will have to look for the plots.
Audible? You decide..
If i remember the measurements from 5th element correctly, we were comparing 0.1% vs. 0.02% (above 10kHz) at higher levels or so. Will have to look for the plots.
Audible? You decide..