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murali_dece,
Thank you for your suggestion.I follow your step and able to generate the stable output voltage. But i have met a problem that the output voltage will be increase till 28V DC when i using two multimeter to read the output. (able to read individual 24V DC output voltage by using one...
murali_dece,
Thank you very much for your reply.
If I use one RC networks for dual output,then all the output windings can shorted together?
You means both 0V(pin 8 &10) left open and no connect to GND pin?
connect the feedback network to (transformer output S1 or S2 any one dote end) and...
raza,
I only able to found this flyback transformer and generate 24VDC output voltage.You have any recommendation or suggestion.
murali_dece,
u means i need draw the same RC network which i draw last time for both output diodes?For winding (drain 4 & +E 6), i left open and no connect to my...
Orson cart,
(the winding to D2 has the wrong phase and cannot conduct during the flyback period - the transformer needs changing so that there are two secondaries, each with the non-dot end going to the diode). You means all the D2 connecting are wrong? I not really understand what should...
sorry for late reply.
murali_dece,
I have change the capacitor to 50V 1000uF, the output voltage still same(unstable).The Cc value which i using is 0.47uF.The Pot is to adjust the output voltage. I already remove it since it just can adjust one output voltage.
orson cart,
attach are my schmetic...
hi Raza,
both output voltage are 24VDC 2A.I using LM2577S-ADJ and never use heat sink for my final assembly. or this is the root cause for can't generate stable output voltage?
hi murali_dece,
Thank you very much for helpful and useful advice.
I just finish my assembly with all components and found out the output voltage is very unstable(voltage flow between 23.7VDC to 24.3VDC). I have make the change to input voltage became 12VDC 2A, so this is the main reason that...
hi murali_dece,
I use 0.22uF capacitor, 2k resistor and 1n4148(fast switching diode) for snubber circuit, but the temperature of IC still high. I no sure which components i select wrongly? fast switching diode is same with fast recovery diode?
By the way, Can i use 37k and 2k for feedback...
murali_dece,
attached is my final circuit design. There is any way to discharge for filter capacitor for second output (same rate from first output)?I thought no path to discharge for filter capacitor for second output will cause the IC overheat.
Raza,
24VDC, 0.5mA x 2
murali_dece,
when I switch off the 12V DC power supply, the voltage from second output will drop very slowly(0.01VDC~0.02VDC), meanwhile the voltage from first output is drop normal..at the same time, the temperature from IC chip is high.
what is the root cause for this...
hi all, thank you for all reply and advice.
I was able to generate first output(24VDC) with S1 and 0V,but further add on S2 and 0V,the circuit showed error and can't generate both outputs(24VDC). For the second output, I only connect the zener diode(1N5818) and capacitor. Should I add the...
very appreciate for all reply.
YAS_HASHI:
You mean this flyback transformer cannot work when the voltage less than 100V?(since this transformer only available for 100V to 24V).I can't find the other flyback transformer which is under my requirement in the market anymore.
murali_dece:
Thank you...
Hi,
I'm trying to design a flyback DC-DC converter which can provide up to 24V DC from a normal 12V DC lead-acid battery that every car has. It can be used to run radios, small lights, relays, horns and other 24V accessories(multiple output) from a 12V vehicle.
I have done research on flyback...
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