• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 107 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LM5164: Output: 12V, 1A circuit is not working.

Siddharth Patidar
Prodigy 10 points
Part Number: LM5164

  I am looking for a 12V, 1A regulated supply from 12-100V input. I used this reference design and tested the circuit on a breadboard with THT resistors and capacitors.
The output resistor is 1k ohm and I am getting linear output till 20V. It damaged chips on higher voltages. 
What could be the problem?
"I am searching for a regulated power supply that provides 12V and 1A, and can take input within the range of 12-100V. I have used a reference design and constructed a circuit on a breadboard using through-hole resistors and capacitors. The output resistor is 1k ohm and I am getting a linear output until 20V. However, when I try to increase the voltage beyond 20V, the chips get damaged. Can you help me identify the problem?"

  • 0
    TI__Guru 73780 points

    Hi Siddharth,

    Thank you for considering LM5164.  You are looking for 12V and 1A regulated supply, why do you raise the output voltage to 20V? 

    Anyway, I am afraid the issue is related to your breadboard. The switching mode supplies should be implemented on PCB to prevent parasitic inductances and capacitance of the breadboard from affecting the normal operation or even damage.  Please order an LM5164 EVM which should meet your specification and run the test with it. 

    https://www.ti.com/tool/LM5164-Q1EVM

    Hope this clarifies.


    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    I apologize for the previous confusion. The requirement is to reduce the voltage from a maximum of 80V to 12V. I am currently getting a switching waveform of 310kHz, but the duty cycle remains above 96%. I am wondering if the breadboard will make a significant difference. 

  • 0 in reply to Siddharth Patidar
    TI__Guru 73780 points

    Hi Siddharth,

    If Vin=80V and your Vout setting point is 12V, then 96% duty is obviously wrong.  I would suggest you to get our EVM and evaluate the IC performance on the EVM.  Breadboard hardly works due to noised.

    Thanks,

    Youhao