TPS51120: TPS51120 CURRENT MODE OPERATION DESIGN EQUATIONS CLARIFICATION REQUIRED: WHAT DOES THE Gm PARAMETER CORRESPOND TO?

Inaki Mutuberria

Part Number: TPS51120

Hi everyone!

Just a simple confirmation concerning the COMP signal circuit calculation equation stated at the TPS51120 user manual before validating my pre-design for Current Mode operation.

The formula for the calculation of the Rc resistor includes several parameters. Everyone of them are clear for me except that stated as Gm.

I guess it corresponds to the transconductance amplifier gain, especified as 280 microSeconds at the data sheet.

The confirmation or correction of this supposition would be very much appreciated.

Thank you in advance for your help and have a Merry Christmas, wishing all the best for the coming 2017.

Iñaki Mutuberria

SPAIN

over 7 years ago

0 JohnTucker over 7 years ago

TI__Guru**** 191445 points

Yes Gm = error amplifier transconductance. Actually 280 micro Siemens, not micro Seconds. 1 Siemen = 1 A / V.

0 Inaki Mutuberria over 7 years ago in reply to JohnTucker

Prodigy 130 points

Thanks a lot, John, for the confirmation. Obviously, transconductance is measured in microSiemens; not in microSeconds. Sorry for the lapsus at enunciating the post.

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TPS51120: TPS51120 CURRENT MODE OPERATION DESIGN EQUATIONS CLARIFICATION REQUIRED: WHAT DOES THE Gm PARAMETER CORRESPOND TO?