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PMP4344: Solution 1D AC to DC Power Supply

Navi Singh
Prodigy 230 points

Part Number: PMP4344

Hi,

I am designing AC to DC SMPS in automation Field. My Power Supply is requirement in below details-

  1. Input Voltage - (85 to 264) VAC 
  2. Output Voltage- 5VDC/1A or 5VDC/2A (Both are given)
  3. Voltage Accuracy- 1% to 2%
  4. Power -5W/10W
  5. Line and Load Regulation- 2%
  6. Ripple- 50 to 150mV
  7. Efficiency-80 to 90%
  8. Isolation- 4000VAC (Input to Output)
  9. Protection- Over Current, Short Circuit, Over voltage and Temperature Protection.

I have searched some solution. I have some query as per below Reference Design-

Reference Design Number- PMP4344 (85-265) VAC

  1. Can This Power Supply working input  Voltage (75 to 275)VAC

Lower Voltage -75VAC and Upper Voltage-275 with 5V/1A and 5V/2A

  1. I want to set output Voltage 5.1 or 5.2VDC. Which resistance value is change in Circuit?
  2. I want to set input under voltage and input over voltage limit. How will be set in circuit.
  3. If Load variation(200mA,500mA,1A,2A) output voltage is constant
  4. Line variation-? Load variation-?
  5. Why are connect resistance divider R16&R17 and R18&R19 in output terminal.
  6. What is size of PCB and BOM Cost.
  • 0
    TI__Prodigy 250 points

    Hi, Navi

    Already assign the engineer to answer your question.

    Regards,

  • 0
    TI__Intellectual 1580 points

    Hi, Navi

    for the PMP4344

    1, Np:Naux:Ns=91:32:7, the Vds rating is Vinmax+Np/Ns*(Vout+Vsrrec)+Vspike, if you increase Vac from 265VAC to 275VAC a little bit, I think maybe the main switching voltage rating is still ok, but you need to check in the real board depend on the voltage derating you would like to achieve

    2, you can reduce R9 a little bit to increase output voltage from 5V to 5.1V, please use spread sheet UCC28710 for the calculation

    3, for R8 can set the Input voltage UVLO, please refer spreadsheet, https://www.ti.com/lit/zip/sluc590

    4-5, basically, UCC287XX is a PSR control, so the expected line and load regulation is around 5%

    6, not sure about that, I think it is just the bleed resistor on output which is not related with power stage design

    7, you can refer the PCB file for a check, 22mm(L)X21mm(W)x20mm(H). and refer the BOM in the file for cost evaluation. 

    BR

    Max