Am I missing something, but how can it affect feedback loop?R53 etc ( R turn on ) should be closer to 15 ohms
You mean put 10-22 Ohm in series with D9 and D10?it is common practise to put resistors in series with the associated diodes
Yup, this is my mistake, thanks. I replaced it with a leaded resistor, should work for now.R43 needs to be at least 1W rated - 20mA x 28V = 560mW
Hello, mtwieg! Thank you for telling about this interesting method of testing feedback loop. I tried it just as you said and here is some data:Porsche, it's probably worth your time to take a couple steps back and examine your feedback loop more closely.
Vout | Veap |
42.62 | 5 |
42.64 | 4.8 |
42.66 | 3.7 |
42.68 | 1.3 |
42.70 | 0.4 |
42.76 | 0.25 |
Vout | Veap |
5.9 | 5 |
6.71 | 4.9 |
7.54 | 4.8 |
8.38 | 4.58 |
9.21 | 4.29 |
10.04 | 3.9 |
11.70 | 3.2 |
12.54 | 2.84 |
13.37 | 2.44 |
14.62 | 1.8 |
15.03 | 1.6 |
25.4 | 0.2 |
Yes, it is there now. 220nF. Fitted it right at the MOSFETs pins.did you fit the film/foil caps across the totem poles?
I am sorry for stupidity of following question but Is the C26 is only tool I need to use to tune speed of the control loop? I mean there is R41 @ 220R as you told me. Should I leave it there for now?you need to slow the control loop further
I don’t think so. First of all because I use only SMPS TDK-Lambda GEN 600 to power up my circuit. And the second thing is we have 50 Hz power outlet here in my country. So, it has nothing to do with 60Hz of power supply ripple.is 8.33mS period, I assume you have a 60Hz supply? this is the ripple on the input ... see for yourself .....
Looking at the datasheet, it gives a CTR range of 19-50%, but it isn't clear how much of that is due to temperature variation and how much is process variation. I'm assuming it's mostly from temperature, but I wish they included a histogram or something. Anyways thanks I'll keep this part in mind.HCPL4503 and the associated range have narrow and low gain - and are used in millions of telecom supplies as they are stable ....
GEN 600-8.5-3P400 can supply 8.5A average current @250VDC. But I set current limit around 2.5A. Increasing of this threshold (up to 6-7A average) didn’t affect at converter so I dont think PSU hits CC mode.How much current can it supply ? @ 250VDC ?
I set Vout to 350V. What is the source of RFI in my converter? MOSFETs? Should i increase turn-on time?you power source is hardly a true voltage source is it ? with about 1/2 a volt peak of ripple at 315W, of course we don't know what the voltage was set to for that test ?
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