Hello,
I made some samples using MP5031 and MP2491C for PD charger solution. MP5031 can be controlled as slave by MCU, such as configuring GPIO1,GPIO6 function of MP5031 to control MP2491C output. Now I can get the required 5V, 9V, 15V, 20V by USBC PD Meter trigger. But the PD charging to laptop is not working, the pictures are as below for your reference. Could you kindly help to have a look at this issue? Thanks.
Is there anyone who can help on this issue? Thanks.
Hello,
Do you have a schematic to share in order to further debug this issue? I am curious to see what components are involved and how the output FET is connected from VBUS_P.
Hi Krishan,
Do you have any suggestion for this issue? Can you please kindly provide the recommended register settings for PD chip MP5031 when it is used together with MP2491C? Thanks a lot.
Best Regards.
Peter Wu
The following image shows a reference design combining the MP5031 and MP2491C.
The fact that you are able to get the fixed PDO voltage settings are a good thing, meaning that the MP2491C is all good. From the schematic you show, I see nothing wrong here which supports that claim (typical application below):
This means the issue can be narrowed down to the MP5031. While reviewing your schematic I noticed the following about the MP5031 (with typical application of MP5031 for reference):
(See bullets below that reflect highlighted pin functions)
- You have I2C_MODE pulled high, meaning it is set up as a slave. GPIO5 and GPIO6 slave functions are disabled, yet your schematic indicates you are using them. Would you see this being an issue? Just good to double check.
- Why is VDD pulled up to 5V? This is a 1.8V LDO Output. Pulling up to 5V would directly impact internal digital control and should only be decoupled with a 0.47uF capacitor.
- The datasheet specifies that it should be decoupled with a 4.7uF ceramic capacitor. This would be recommended over the 2.2uF capacitor you have as shown in your schematic.
Being paired with the MP2491C, the default register settings should be perfectly compatible with the device (shown for reference):
I know this is a lot to take in at once, but please start by looking at highlighted sections of the MP5031 that deviate from the typical application and test again. I would also highly encourage reading through the MP5031 datasheet, specifically on the sections that were pointed out here.
Best,
Krishan
Hi Krishan,
Thanks for your advice. I will do further check.
Let me know if there are any updates at all. If not, this post will automatically close. Feel free to make a new post and reference this one if in the case if your update comes in before things are closed.
Best,
Krishan
This topic was automatically closed after 3 days. New replies are no longer allowed.