This I did not try but worth considering You can insert a voltage divider network with the output feeding an opamp input, the TL431 will be used as a reference for the opamp other input.Ī comparison is made with the reference and the output of the opamp will feed the opto directly. One other thing that I added was a 200nF cap across the zener and it helped a lot with a stable regulation. I suggest you insert a preset at first until you get the right resistor value than you can put a fixed one when the value is known. In your case I guess you have to go somewhat lower with the resistor.
What I found out was that the resistor before the zener has to be tailored in such a way to the point where the zener starts to conduct when it hits the target voltage. The 33v zener is fitted so that the TL431 does not see more voltage than it can handle.
On the other hand the low side switch source is to ground so the dumping gate resistor is to ground. Sg3525 Ir2110 Smps Rarest Pdf The Onlyīettecher1KwSmps correction.pdf The only mistake I can see here is that R14 should be tied to pin 6 of the IR2110 instead of ground Regards Silvio. You should use an output inductor with each rail I guess 20 to 30uH each. You must have a small load at the output. The balance here is not good and it is opening and shutting suddenly the pulse width 2) Put a small capacitor across like 0.47uf entering the diode for the opto coupler for start and see if it tames down a little bit. I suggest you put a 10K multi turn preset in line with the zener diodes to find the right value of the resistor. Usually an ETD39 core takes around 28 to 30 turns for the primary winding.Īre you sure it is an ETD39 not something else DO you know the core material 2) if you have few turns the core may saturate and heat up quickly.Īt 80Khz we do not usually go more than 1600 guass (0.16 tesla) That circuit I tried it also and I experienced the same thing. PWM Supply using 16V supply from transformer PWM Sanken B2 Input 500V output 12-19V and PWM controller using UC3845 MOSFET can be using IRFPG40 N-Channel Power Mosfet.Ĭore PFC using this ferrite core full turn 1x with copper wire 1.5mm, Core Diameter Outer 47mm, Inner24mm, Thickness18mm Np Working Frequency 30-40kHz 18 turns 40-50kHz 16 turns 50-60kHz 15 turns 60-80kHz 14 turns 80-100kHz 12 turns 100-130kHz 10 turns Np 14 turns Ns 6 6 output 90V copper wire 1:1.
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