LMZ34202: Can Buck module drive higher output capacitance than specified max limitation

John11513

Part Number: LMZ34202
Other Parts Discussed in Thread: LMZ31704

Hi Experts,

My customer want to use buck module to step 15V input down to 5V output. The problem is there is >2200uF of capacitance on 5V rail, however all our buck module specified a max limitation on output capacitance. I am wondered is there any solution making our module can work with higher load capacitance? I noted some of module has adjustable soft-start time, i am wondered if we can implement higher output capacitance through setting longer soft-start time?

Thank you!

John

over 4 years ago

0 Frank De Stasi over 4 years ago

TI__Guru 71345 points

Hello

I would say that 2200uF is much too large.

Not only would you have issues with soft-start but also the loop compensation for the device.

You may be able to use the "versa-comp" pin to help with the compensation for this device.

It would be best to get an EVM and test your application before finalizing your design.

I will speak with the engineers responsible for this device and see if they have any more advice.

Thanks

0 Frank De Stasi over 4 years ago in reply to Frank De Stasi

TI__Guru 71345 points

Hello

Our module team suggest using the LMZ31704.

It has a larger range of output capacitance.

Thanks

0 Frank De Stasi over 4 years ago in reply to Frank De Stasi

TI__Guru 71345 points

Hello

I will close this post due to inactivity.

You can re-open if you have more questions.

Thanks

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LMZ34202: Can Buck module drive higher output capacitance than specified max limitation