Dear all,
I have no idea why MPS is trying to hidden the posts on this product?
And I received Emails from interns?
So when the issue can be repeated from MPS and there are huge voltage bump on the PSM phase.
Why there are no document to settle these issues and simply asking customer background.
Whatever the background the main goal is making the product works from begging.
What a disappointed MPS.
Bests,
Brian
Hi Brian,
Unsure on the issues you experienced with the posts but wanted to address your issue with the MPQ4470.
Likely the reason many have been asking for other pieces of info are to properly investigate your issue with someone that’s local to you. In terms of the PSM issue you’re experiencing, likely there may be a limitation to the model used in the designer tool. As such, the tool itself should be looked at as more of just a guideline rather than a 1:1 representation of how the device will exactly operate.
As you mentioned in one of your other posts, there are many factors that could go into the real life application that the tool may be limited on modeling and may not take into account. However, rest assured that the MPQ4470 has been released for years now and millions of these devices have shipped to customers worldwide with no issue.
I would suggest to provide more details regarding the operating conditions, system level key care-abouts, test scenarios, etc. in the same thread to Jessie Guo. At the same time, I can work to align with them to understand what obstacles need to be resolved to get you some local support.
I understand the frustration you’re experiencing with this issue but hope you can provide some more insight so we can properly expedite support.
You know this argument is very very poor and not even stand a point.
The issue we are discussing is above 5V cases. AKA 12V or any voltage range above 5V.
And please explain what do you mean no issue? We are not telling MPS that the converter is not regulating nor the converter is not functioning. We are here discussing the voltage bump on PSM state, which is far away from accepted range. Over 8% on FOX proposed configuration and over huge voltage error on our experiment studies.
Now you are telling “US” that when MPS internal had tested and repeated the issues that we had experienced. Then you want to kill this issue when there are no solutions on MPS sides and cannot settle the inherent chip issue?
How many posts had been opened and even FOX had tried on EVM or EVB to repeat the issue.
I had repeated many many times the during PSM phase there is a huge bump on FOX proposed schematic, which is not reply or explain from FOX to clear out the result is align or not,
What MPS is suggesting on here is to keep quite on these issues and ZERO plans to settle the issue s that everyone is having.
If MPS have no issue on this product why FOX proposed schematic have no voltage weep nor voltage error curve? all we see is a scope capture with so limited information. Where are the data to proof the issue is settled when FOX proposed configuration have no issue and MP(Q)4470 product is stable on >5V applications?
Bests,
Brian
Hi Brian,
I’ve aligned with the team who responded above to you and she is working to assist you. There may be some miscommunication and misinterpretation regarding your issue so it would be best to find time to chat via a conference call with her.
If unable, kindly respond to the other FAE’s email requesting more info and background and someone from our team here can assist you via a conference call as well. Thanks.
Had phoned Jessie and relayed the issues.
Cross examination on the issue and see if it is again repeatable.
Bests,
Brian
Sounds good, Brian. Appreciate the update and more importantly appreciate your patience as our team works through your issue after receiving details and have a clearer understanding of the problem.
