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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 23rd August 2017, 04:51 PM   #1011
keantoken is offline keantoken  United States
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Using the 1381/3503 is sort of a gamble. I really don't know how that will work out. Do you have 2SC4793/A1837?
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Old 25th August 2017, 07:05 PM   #1012
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
Thank you so much

Can I route C28, C29 and C15 grounds separately to -GND ?
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Old 25th August 2017, 07:21 PM   #1013
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Keantoken's CFP cap multiplier
2SC4793LB-TF3T - Power Transistor 230V 1A

2SA1837LB-TF3T - Power Transistor -230V -1A

Profusion has the 2SC4793/A1837 parts
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Old 25th August 2017, 07:26 PM   #1014
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Keantoken's CFP cap multiplier
I have rearranged the layout... now C15 gnd goes to C29 GND and than to -GND.... is this ok ?
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Old 25th August 2017, 07:47 PM   #1015
keantoken is offline keantoken  United States
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Those transistors are from UTS, not Toshiba. I don't know how well they meet the original spec.

Looks like C13 and C11 are swapped.

It looks like KM grounds are not routed with the KM outputs, which is not good EMC practice but may be a non-issue.
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Old 25th August 2017, 09:17 PM   #1016
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
Eagle yes you got thank you, I will swap the caps values.

You mean I should place the KM grounds over the KM rails ?
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Old 25th August 2017, 09:29 PM   #1017
keantoken is offline keantoken  United States
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That would be ideal, to reduce the loop area between rails and ground.
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Old 25th August 2017, 11:08 PM   #1018
keantoken is offline keantoken  United States
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It really depends on the layout, I think the most important thing is that there is a short path from the driver collectors to the zobel and drain grounds. So much of this is context-dependent, I can only make the most general comments, and I still may be wrong.
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Old 26th August 2017, 09:27 AM   #1019
RCruz is offline RCruz  Switzerland
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Originally Posted by keantoken View Post
The decoupling caps next to your lytics should be around 2.2uF or larger not to resonate. 5mm caps up to 10uF are available.
I was convinced the KM could support small films at the input and output without fear of oscillation.

The change you propose is to avoid oscillation or to not create other type of nastiness ?
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Old 26th August 2017, 10:03 AM   #1020
keantoken is offline keantoken  United States
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It is just my suggestion to prevent the film caps from resonating with the lytics. It has nothing to do with oscillation. No regulator can prevent this. But if you have found some kind of decoupling that you prefer by experience, you don't necessarily need me to justify it.
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