• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 240 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.

LM5022 wide input schematic and Layout

Atul Bhakay
Genius 3205 points
Other Parts Discussed in Thread: LM5022

Hi,KIndly verify the schematic and layout fo this wide input power supply using LM5022 in flyback mode

0121.PSU BOARD SCH1 latest.pdf

7080.PSU BOARD V2 LAYOUT(18 02 13).pdf

The input = 17V to 285V AC or DC

Output = 5V/ 0.8A and 12V / 1.5A

Regards

Atul Bhakay

  • 0
    TI__Expert 3545 points

    Atul,

    There are some parts of the schematic that I'm not sure what you are trying to accomplish. For example what is the reason for Q8?Q7 is for start-up are to you trying to turn off the start-up FET?  I'm also concern that the VBE of Q8 will affect the UVOL turn-on over temperature?  Your feedback compensation R40, C11, and C13 are connected to the LM5022 COMP pin, but the other end is open.  I would not connect the OPTO and compensation the way you have it hooked up.  A simpler way to to connect the emmiter of U4 to ground, then connect the collector of U4 to the COMP pin of the LM5022.  Then ground the FB of the LM5022.  You have a loop compensation network on the secondary R46 and C3.

    Terry