TPS51275: Calculation formula and OCP .TRIP. to each 16Ampers, 14.5Ampers

PHILIP HSU

Expert 1900 points

Part Number: TPS51275

Hi Sirs,.

do you share the Calculation formula and OCP .TRIP. to each 16Ampers, 14.5Ampers on TPS51275B

0 Yuchang Zhang over 5 years ago

Hi Philip.

Equation 3 + Equation 4 in page14 of Datasheet are used to calculate the OCP.

Yuchang

0 PHILIP HSU over 5 years ago in reply to Yuchang Zhang

Expert 1900 points

please teach us that how Rcs=41.2 Kohm was calculated ? Iocp calculated really ?

0 Yuchang Zhang over 5 years ago in reply to PHILIP HSU

I am not sure where's the 41.2K you talk, but let me do a brief explanation for the calculation process.

when you cal the OCP, you just need to know Rdson of Low-side mosfet, VIN, Vout, Fsw, ICS(10uA), L vaule

if you want to get RCS, you just need use Equation4 to get VTRIP with the OCP value you want to set. then use Equation3 to get RCS.

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