LMR62014: LMR62014 Compensation Values

Lance Collins

Part Number: LMR62014

I would like to perform my own loop analysis on the LMR62014. Can you tell me the value of the compensation components (Rc and Cc), the gain of the transconductance Gm amplifier and the slope of the ramp generator? The value of the sense resistor is 0.033-Ohms as indicated on the block diagram, so already have that.

thanks,

Lance

over 8 years ago

0 Frank De Stasi over 8 years ago

TI__Guru 72035 points

I am not sure if that information is available. I will check with the Webench team.

0 Frank De Stasi over 8 years ago in reply to Frank De Stasi

TI__Guru 72035 points

I have attached a sketch showing some of the values you requested.

Please keep in mind that these values are typical and will change with temperature, etc.

TI does not in any way guarantee these values.

5315.Scanned from device SCPR310.pdf

0 Lance Collins over 8 years ago in reply to Frank De Stasi

Intellectual 535 points

Hi Frank,
Thanks for the fast response. Regarding the current amplifier, the gain is listed as 12V/A, but this is supposed to be just a gain of 12, right? Given that the current can be up to 1.4A, this would be 1.4A *12V/A = 16.8V, which doesn't work unless there is an internal charge pump. The block diagram shows R-sense of 0.033-Ohms, so the output of the current amp (if gain is 12) = 1.4A*0.033-Ohms*12 = 0.5544, which is reasonable. Can you please double check the units?
thanks,
Lance

0 Frank De Stasi over 8 years ago in reply to Lance Collins

TI__Guru 72035 points

The effective sense resistance would be 1/12 Ohms; or 0.0833 Ohms.

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LMR62014: LMR62014 Compensation Values