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LM5156: LM5156

m marsh

Prodigy 30 points

Part Number: LM5156

Tool/software:

Hello again! I am revisiting use of the LM5156 after having successfully gotten the board to deliver the appropriate power at full load. We are now attempting to use the output of this board to directly connect to and power two LDO's configured as current sources in parallel. The LM5156 appears to be struggling again to provide the desired power. Are there any tips or tricks for chaining these regulators? We have the recommended input capacitance for the LDO's but is it recommended to filter the input? Any tips would be appreciated!

over 1 year ago

0 Moritz over 1 year ago

TI__Genius 15575 points

Hi,

Thanks for reaching out.

Can you please send the schematic of the board you are using?

Then i can do a review. Please also provide the specs (Vin Vout Iout).

Best regards

Moritz

0 m marsh over 1 year ago in reply to Moritz

Prodigy 30 points

Sorry for the delay! This post was a follow-up to the following thread:

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1357874/lm5156-power-output-issues-at-full-load

The previous provides the 44V supply for the attached circuit of LDO's setup to be current sources.

0 Moritz over 1 year ago in reply to m marsh

TI__Genius 15575 points

Hi marsh,

m marsh said:
The LM5156 appears to be struggling again to provide the desired power.

How does the LM5156 behave? Is the output voltage dropping?

Can you please send some scopeshots? I would like to see Vin, Vout, switchnode and CS in one scopeshot.

Thanks and best regards

Moritz