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Old 29th June 2020, 02:13 PM   #471
Salas is online now Salas  Greece
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GB  For Salas SSLV1.3 Ultra-BIB
No need if so
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Old 30th June 2020, 06:12 PM   #472
codyt is offline codyt  United States
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I apologize if this has been covered elsewhere, but can I go with a smaller reservoir cap than 6800uf? I’m dealing with a pretty small spot in my chassis and will be stacking my boards. Moreover, it’s a 2U chassis and I have to watch height. The largest cap I can find that meets my needs is 3300uf.
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Old 30th June 2020, 06:40 PM   #473
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I will have exactly the same, 2U and stacked boards. Maybe you need higher voltage rating, but for 25 V this is fine capacitor that fits and is big enough for a 0,5 A load:

LKG1E472MESZAK Nichicon | Mouser
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Old 30th June 2020, 06:54 PM   #474
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Thanks for sharing! That could be a good option, though I’ll be getting a little more than 25v.
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Old 30th June 2020, 07:51 PM   #475
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what's the max height you can do?

CDE has a 380sx and tdk/epcos has one that's 30mm I think.
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Old 30th June 2020, 08:35 PM   #476
Salas is online now Salas  Greece
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When deciding the reservoir capacitor's value we should consider our transformer's secondary and the load's peak current demand so to know how much DC input voltage is left to work with after losses and AC ripple.

Vpk-pk ripple= I_Load /2*f *C (use Volt Amp Hz Farad)

Don't forget f=50Hz or 60Hz (EUR USA). C=C1 in our circuit. For example when C1=6800uF plug 0.0068 Farad.

A true RMS multimeter can read ripple's AC RMS value when you don't have an oscilloscope to see it peak to peak. Red probe on Rf's bottom leg (the one near Cs) and black probe on the 0V output. Multiply the reading by 3.3 for pk-pk because the waveform's shape is not a perfect sawtooth (x3.46). The actual Vpp result can even prove little better than what the ballpark formula predicted.

When subtracting two bridge diodes Vf loss and Vripple pk-pk for given max load current and the reservoir capacitor used, we want our transformer to provide for all that plus 5V Vin-Vout DC margin for M1 to work best as a CCS.
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Old 30th June 2020, 08:38 PM   #477
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I’ve been trying to stick to 25mm height. I just found a 25x25 5600uf 35v Pana that should work.
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Old 30th June 2020, 08:40 PM   #478
codyt is offline codyt  United States
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Quote:
Originally Posted by Salas View Post
When deciding the reservoir capacitor's value we should consider our transformer's secondary and the load's peak current demand so to know how much DC input voltage is left to work with after losses and AC ripple.

Vpk-pk ripple= I_Load /2*f *C (use Volt Amp Hz Farad)

Don't forget f=50Hz or 60Hz (EUR USA). C=C1 in our circuit. For example when C1=6800uF plug 0.0068 Farad.

A true RMS multimeter can read ripple's AC RMS value when you don't have an oscilloscope to see it peak to peak. Red probe on Rf's bottom leg (the one near Cs) and black probe on the 0V output. Multiply the reading by 3.3 for pk-pk because the waveform's shape is not a perfect sawtooth (x3.46). The actual Vpp result can even prove little better than what the ballpark formula predicted.

When subtracting two bridge diodes Vf loss and Vripple pk-pk for given max load current and the reservoir capacitor used, we want our transformer to provide for all that plus 5V Vin-Vout DC margin for M1 to work best as a CCS.
This is outstanding - thanks!!
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Old 30th June 2020, 08:55 PM   #479
Salas is online now Salas  Greece
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Rf makes a little extra loss too that we can measure as DC RMS voltage drop across its legs. In general we will not hit input DC starving thresholds with logically chosen transformer outputs and C1 values for the usual loads mated to SSLV1.3. But I gave you the full breakdown to know how things work in case it will be needed.
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Old 30th June 2020, 09:02 PM   #480
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Understanding the problem is so much better than just getting an answer. Now I have an answer and I learned something!
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