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UC3843: UC3843

Atul Bhakay1
Prodigy 160 points
Part Number: UC3843
Other Parts Discussed in Thread: UCC28740

Hi, I want to design an ISOLATED flyback based, power supply using UC3843 with following specs:-

Input = 20VDC to 70VDC

Output : a) 5V / 0.2A

b) 5V / 0.2A and 27V / 0.15 A (these 2 outputs have common ground)

Kindly advise a solution using UC3843

Regards

Atul Bhakay

  • 0
    TI__Expert 6080 points

    Hello Atul,

    Thank you for your interest in UC3843. Unfortunately, we do not have a reference design to suit your specifications. 

    Please use the Webench tool to get a starting point for your specification linked below:

    https://webench.ti.com/power-designer/switching-regulator/customize/81?AppType=AC&Flavor=none&O1I=1&O1V=5&Topology=Flyback&VinMax=70&VinMin=20&base_pn=UC3843&isolated=Y&lang_chosen=en_US&line_fsw=60&op_TA=30&optfactor=3&origin=pf_panel&refpage=https:%2F%2Fwww.ti.com%2Fproduct%2FUC3843%2Ftoolssoftware&source=AC

    Regards,

    Sonal

  • 0 in reply to Sonal Singh
    Prodigy 160 points

    Hi Sonal, Thanks for your quick reply.

    I want to design an isolated dc to dc power supply with input voltage range from 20V to 70 V.

    The main output voltage is 24V / 1A. 

    Apart from this mail output, there are 3 other outputs with a combined wattage of  7W.So total output power is 24W + 7W = 31 watts

    With the given input voltage range which is the best suitable device to design the power supply ?

    Regards

    Atul Bhakay

  • 0 in reply to Atul Bhakay1
    TI__Expert 6080 points

    Hello Atul,

    I would recommend using a flyback controller like: UCC28740, below is the link to the reference design using this controller for your reference. 

    http://www.ti.com/tool/PMP40376

    I have used the filter in the TI reference design library for your specific requirements as a starting point.

    Regards,

    Sonal