Hi,
Can you please review the attached circuits/
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Hi,
Could you verify the values for the output capacitor? C424,C425,C429 and C430?
For ~350kHz of operation you may need at least 4x22uF, 16V rated capacitor for the design.
Thanks
-Arief
Thank you for your review.
Please find the Webench report for both regulator circuits attached below.
In these reports the recommended output capacitor is electrolytic. The boards are going to be used in hazardous location hence I have to use only ceramic caps. I have used closest alternate to electrolytic.
Hi,
It seems that for some reason i could not open the pdf file.
Yes, the use of ceramic capacitor should be ok. In order for the part to be stable the recommended number of ceramic capacitor at the output is 4x22uF with 16V rating. This way the capacitor did not derate much with the DC bias voltage of 5V or 3.3V.
Thanks
-Arief
Hello Arief,
Attaching the reports again
I understand your recommendation but the Webench tool suggested the output cap suggested was 300uF 6.3V for 3.3V regulator and 180uF 16V for 5V regulator. I have used equivalent ceramic caps for my application constraints.
Can you please look at the report ?
Hi,
Yes the report looks ok, the one thing i would check is the derating of your ceramic output capacitor since the electrolytic is more tolerant to DC bias reduction.
If you can give me the part number for your output capacitor, then i can check whether it is sufficient.
Thanks
-Arief
Hi,
The part numbers for o/p caps for 3.3V circuit
C3216X5R1A107M160AC Qty: 3
CL10B474KO8NFNC Qty: 1
The part numbers for o/p caps for 5V circuit
C3216X5R1A107M160AC Qty: 2
CL10B474KO8NFNC Qty: 1
Hi Sahol,
Apologize for the late reply. I have checked your capacitor and the part number should be ok for both webench design
Each capacitor derates to ~48uF for 3.3V bias and 28uF for 5V bias
Thanks
-Arief