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Lowering SMPS dissipation
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dzseki:

--- Quote from: NiHaoMike on December 02, 2018, 03:54:43 pm ---What about use the lowest gate resistance that doesn't ring to minimize switching losses and then add filtering to solve EMi problems?

--- End quote ---

As it is this is a good idea, however when the board is in its place Q20 is literally unreachable with a scope probe, so this encumbers the effort.


--- Quote from: xavier60 on December 03, 2018, 02:17:22 am ---Rt and Ct to me read 7.5K and 1nF on pins 18 and 16 of the TDA4718A.
When I try to apply these values to the VCO frequency chart on page 15 of the TDA4718A data sheet, the result is literally off the chart, very high.
Can someone confirm?

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On my copy it is still on chart, and it is somewhat beyond 100kHz.
xavier60:

--- Quote from: dzseki on December 03, 2018, 07:52:29 am ---
On my copy it is still on chart, and it is somewhat beyond 100kHz.

--- End quote ---
Yes, I misread it. Still high, so switching losses are significant.
dzseki:
So I made a custom heatsink. I've checked the ready made ones, but wasn't too impressed by any of them... So for this round the circuit remains unaltered only the heatsink was changed.
PS.: I haven't tried the board yet...
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