C54/C58 For LDO Supply on NUCLEO-H755

[bramble]

Hi,

According to mb1363 for the H755 Nucleo, in order to change from the default SMPS to internal LDO supply, to enable 480 MHz clock, I need to change C54/C58 from 100 nF to 2.2 uF. However it appears that there are no capacitors installed on my board (which is working fine BTW).

I'm guessing that the 100 nF's have been left off to make it easier to simply add the significantly larger capacitors needed with the LDO, and presumably getting away without the smaller ones? Have I missed something?

Also, just to confirm please that R33 is indeed 0 ohms, in other words it's another solder bridge.

Thanks in advance.

[KDJEM.1]

Hello @bramble,

 

If you want to switch to internal LDO from internal SMPS, I recommend you to fit two 2.2 µF capacitors (C58 and C54) to a 0402 SMD footprint small footprint).

For LDO configuration, R33, SB74, and SB25 should not be fitted as shown in the MB1363-H755IQ-D01 schematic.

 

Thank you.

Kaouthar

 

[bramble]

Thank you very much indeed @KDJEM.1 

[Mike_ST]

Hello,

>> However it appears that there are no capacitors installed on my board

From what I know, C54/C58 are supposed to be mounted.

Could you post pictures (front+back) of the board ?

>> Also, just to confirm please that R33 is indeed 0 ohms, in other words it's another solder bridge.

yes, R33 is a 0 Ohm resistor/solder bridge. Not fit.

 

[bramble]

Thank you for confirming @Mike_ST , I will upload photos later today as requested.