MPS3690-50B switching glitch issue

Integrated Inductor Power Modules
1

We have different problem using the MPM3690-50B it is currently super noisy and voltage ripple doesn’t look like in the datasheet.

We noticed also that the text in the datasheet maybe confusing. As it say for the MPM3690-50B to add a 60.4K resistor betweem VS1P and Another between FB2 and VS2P … not of the drawing is showing that and there is already a 60.4K resistor internal … Does it require it or not ?

Here our schematic

image
image1736×1069 144 KB

2

Hello,

Yes, the internal block diagram shows the 60.4k inside.
Connect a 60.4k resistor to FB1 to VS1N similar to the typical application circuit. If you are using the second output, you would connect 60.4k resistor to FB2 to VS2N.

Best Regards,
Yu