I used LM25088 buck controller to create a lead acid battery charger.Since the product is a battery charger, I don't put much capacitance on output of buck converter, since battery is large capacitive load. The output capacitance is 6 pieces of 1206 1u x7r capacitors in parallel. The inductor is SER2915H-153KL by Coilcraft. It is 15uH inductor. Datasheet is here: http://www.coilcraft.com/pdf_viewer/showpdf.cfm?f=pdf_store:ser2900.pdf.I have a customer who wants to use this product as dc-dc converter. I'd like to do so, but the output is unstable without a battery. What can I do to make this design stable without load, hopefully without changing the layout?I'm thinking change switching frequency from 300kHz to 1MHz, and using smaller inductor. Will this get me there?
I would suggest using our WEBENCH tool for the component selection of this device. You can optimize the components, operating frequency, and simulate the circuit.
You can go to http://www.ti.com/product/lm25088
You will see a page like this:
On the right you will see the WEBENCH input panel. Enter your requirements and click on Open Design.
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