• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 39 subscribers
  • Views 624 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TIDA-00779: ENQUIRY: Output 300 volt DC, 0-10A

Akshay Goyal
Prodigy 30 points
Part Number: TIDA-00779

Hi, 

I need to make a power supply design with the following specifications: 

Input: 190VRMS - 250VRMS 

Output Voltage: 300Vdc 

Maximum Output Current: 10A

I want to use TIDA-00779 for the given specifications. Is there any way to use this design for 300 Volt output? 

I am thinking of a solution please correct me if I am wrong. 

  • First step down the AC voltage to maximum 200VRMS and then use the same TIDA-00779 circuit for 300 Vdc output.

Please guide me with your advice as I am not much aware of power supply designs. 

Regards

Akshay 

  • 0
    TI__Intellectual 755 points

    Dear customers,

    Thanks for reaching out. The output of TIDA-00779 is 390VDC and if you need other output voltage like 300VDC, you just need to make very small modification. You just modify the value of R6, R7, R8, R9 so that the voltage of R9 is 5V after dividing. 

    Thanks

  • 0 in reply to Richard Wang11
    Prodigy 30 points

    Hi, 

    Is it feasible to step down the voltage from the boost converter. As Tida-00779 is a boost converter and if the input voltage is above 212VRMS then circuit will have to work in buck mode for 300 volt output. 

    Regards 

    Akshay

  • 0 in reply to Akshay Goyal
    TI__Intellectual 755 points

    Hi Akshay,

    Just aware of your input voltage range. You are right, if the voltage is greater than 210V, the controller will stop working. If you directly use TIDA-00779, the current waveform will be distorted but will not be damaged. Step down the input voltage before PFC is a choice for you to use TIDA-00779 directly. Another way is to buck down the output of PFC from 390V to 300V.

    Thanks

  • 0 in reply to Richard Wang11
    Prodigy 30 points

    Hi Richard,

    I have below queries. Please suggest some solution. 

    1. You said if the voltage is above 210 volts then controller will stop working. In that case my output voltage will remains 300 volts or will it change as the input changes and what will happen to the power factor?

    2. Could you please suggest some converter to step down from 390 volts to 300 volts as I am unable to find any converter which does so?

    3. Is there any way to step down AC voltage from 250VRMS to 200VRMS without using the transformer as the transformer size will be big for 3.5kW power?

    Regards 

    Akshay

  • 0 in reply to Akshay Goyal
    TI__Intellectual 950 points

    Hi Akshay,

    The controller will not work when the input voltage is higher than output, that means output current will have the same shape with input, THDi will be bad at that portion.

    if you want to step down the voltage at AC side, as I know you have to use transformer, for sure the size will be big.

    BR

    Jason