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LM46000: Issues with the Mode and the Efficiency

Richard Elmquist
Mastermind 45250 points
Part Number: LM46000

I have a customer who has some questions regarding the operation of the LM46000.

I have a lot of information that I can send, but I cannot post it here in the forums. Can I send it directly to you to look at? I reall need for you to look at this information so that you can odder your opinion on what might be happening.

Basically the customer is seeing a variation in the switching frequency when the converter changes Modes. In PFM mode the device seems to be operating properly as the frequency does decrease and the efficiency seems to be normal. In DCM mode is where the customer is seeing the issue. The frequency increases (not greatly), but the real issue is that the efficiency drops 25% before it recovers when the part begins to operate in CCM. Is this an issue?

I can send the information as soon as you request.

Thanks for your help with this!

Richard Elmquist