LTC4020 no-load stability


We are using the LTC4020 to charge a lead-acid battery and are having problems with no-load stability of the DC-DC converter. We see this happening during NTC events, where the battery gets disconnected from the charger output so it only needs to deliver a couple mA.

I have a hard time choosing compensation network etc. to ensure stability under all load conditions. Has anyone used the LTC4020 for very light loads? Could you share your design details with me?

Our application is 36-55V input, 24-29V, 2A max out typically. Schematic attached.

// Daniel

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