Hi Tommy,
Thanks for reaching out.
I found the following points:
- You should add a resistor to properly bias TL431.
- A zener diode has to be added to protect TL431, as the abs max. rating will be exceeded otherwise.
You can also refer to this reference…
Hi Zhenyu,
Thanks for using the e2e forum.
LM5155 in isolated flyback topology should be suitable for this application. A reference design for this can be found here: https://www.ti.com/tool/PMP22764
Best regards, Niklas
Hi Davis,
I have new insights that might show the root cause of the issue. Just as mentioned before, there should be possible improvements on the feedback path.
The important part here is the TL431 clamping diode. The anode voltage rating of this diode…
Part Number: LM51561H Other Parts Discussed in Thread: PMP22764 , Hi Team,
We are using LM51561HPWPR into our design to generate isolated 52V from 24V input power supply. LM51561HPWPR EVAL user manual shows that the VCC pin is connected with Auxilary winding…
Hello Dice-k,
Thanks for reaching out. Yes, the board PMP22764 is a very good example as it also includes two PI filters at the input and output of the Flyback, at this link you can find the layout of the board https://www.ti.com/tool/PMP22764 . Let us…
Hello Kurata-san,
Thank you for your patience and kindly restating the question. I have hopefully addressed each question below.
Akira Kurata said: (1) We recognize that the control current of the feedback signal input terminal of most switching power…
Part Number: LM5156H Other Parts Discussed in Thread: PMP22764 , LM5155 , LM5156 Hi All
we want to use LM5156H for PSE Flyback. Would you recommend this device?
If possible Vin from 12V to 48V -> Vout something between 52V to 56V
or at lease Vin from…
Part Number: WEBENCH-POWER-DESIGNER Other Parts Discussed in Thread: PMP22764 Below is screenshot of Webench transformer reference.
※Upper left: 24Vinput, Lower left: AUX, Right: Isolated 56Vout, it is based on Isolated flyback by PMP22764.
https://www…
Part Number: TPS23881 Other Parts Discussed in Thread: PMP22764 , PMP20588 , , BOOST-PSEMTHR-007 , PSEMTHR24EVM-081 Dear All,
we are designing PoE PSE 802.3bt Type 3 Class 5 45W single port
1) I was going through many TI PSE designs, and the PSE output voltage…
Hello Dice-K,
LM5156 can be used on the same layout, so yes, this is a good replacement.
Please have a look at this reference design: https://www.ti.com/tool/PMP22764
Best regards, Brigitte
