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Author Topic: How to find the LT1575 pole capacitor and zero resistor by using LTspice  (Read 246 times)

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Offline andrewshTopic starter

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How to find the LT1575 pole capacitor and zero resistor by using LTspice
« on: March 24, 2024, 02:09:02 pm »
Hi! Can I know how to find my pole capacitor and zero resistor by AC open-loop. The stability : AC open-loop Bode plot has at least 45 degrees of phase margin at both 1% and 100% of the assigned Maximum Load Current.

I don't know how to get C3, C4 and R4.  :palm:

 |O |O |O |O |O |O
« Last Edit: March 24, 2024, 02:20:57 pm by andrewsh »
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Offline aliarifat794

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Re: How to find the LT1575 pole capacitor and zero resistor by using LTspice
« Reply #1 on: March 24, 2024, 02:21:53 pm »
Have you posted your question to LTspice group?
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Offline andrewshTopic starter

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Re: How to find the LT1575 pole capacitor and zero resistor by using LTspice
« Reply #2 on: March 24, 2024, 02:24:13 pm »
Sorry, I don't know that it has this group. How to post it into LTspice group?

Thank you for your reminding :-*
« Last Edit: March 24, 2024, 02:26:53 pm by andrewsh »
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Online RFDx

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Re: How to find the LT1575 pole capacitor and zero resistor by using LTspice
« Reply #3 on: March 25, 2024, 04:41:45 am »
Quote from: andrewsh on March 24, 2024, 02:09:02 pm
I don't know how to get C3, C4 and R4.  :palm:

Take a look at the datasheet of the LT3150 fast transient LDO controller. It contains all the required info to determine the frequency compensation component values incl. the associated poles and zeros.

https://www.analog.com/media/en/technical-documentation/data-sheets/3150f.pdf
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