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why bad load regulation and line regulation of DC-DC ?

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walkalways

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besides of low loop gain , and the offset of error amplifier. there are any other reasons ? thx
 

If voltage mode, the accuracy of sawtooth and the OCMR of error amp may dominate.
 

Bad layout board for DC-DC also makes line and load reg not good. As you know, DC-DC will creat much noise, heavier load more noise. Then if Ground inside chip and Ground for Vout outside are different from each other because of layout board. It will make load and line reg bad
 

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