new design help
I need technical help from you. I have new requirement recd from customer for the powersupply 32V/5Amp. discontinue mode. I designed the pcb for this. I have to place a Transfomer in core size EI33. I tried our txs design software but the optimization not passed. So kindly request you to send the Tx data ASAP. The load is for motor and the motor will operate only for 4 to 5 mins.max in one operation and 5 to 10 times in a day. So can I use our PI device TOP249Y?. The customer is already using Mosfet base supply with same rating. He wants to replace the supply with PI. There is length , width , and Height restriction. so I have to use EI33 core.
Comments
Dear Spock
Thanks for your valuable reply. This will definately work for me. The posted application is using for driving motor to move the object up/down position upto certain limit[time]. this procedure takes maximum 2mins for any direction.
If suppose you have possible, then pls. send me your suggested schematic and Tx data.in PI Expert software I can use maximum core size EI40.
Thanks
Enter your spec into the software and ensure that you check peak loads. Keep the ratio between peak power and continuous power such that the average power is about 100 W. The software will come up with a recommended design. However since peak power is high it may still not be possible to use a smaller core due to large number of turns... I'm afraid, you will have to design with ETD39 or EE40 transformer. I'd recommend the TOP-HX (TOP260EN) family at 132 kHz.
Why do you need strictly discontinuous mode? For 32 V T 5 A I would not advise you to use discontinuous mode. Discontinuous mode will result in higher RMS and peak currents on the primary and secondary side and will have increased losses as a result. Not to mention you will most likely need larger output capacitors also.
Plus at this power level 160 W, you cannot get away with such a small core (EI33)
If this is a peak loading condition (4-5 mins only) then you may be able to pack a few more turns on the transformer. You can specify a continuous power of around 80 W and a peak power of 160 W. This will bring down the average power which is used by the software to select the core size.
If you need 160 W for longer time period (non-peak load condition) then you will need something close to EER35 or EE40. You can see that max power capability of the cores in the Transformer --> core selection dialog in the PI Expert software.