LM5010AQUICK-CALC: LM5010

Hussein A

Hi,

In this file Excel, I find the value of Rfs/Rf1 is swapped , would we have any effect on the calculation other components?

over 3 years ago

0 Wendy Wang1 over 3 years ago

TI__Genius 11370 points

Hi,

What is the Rfs you refer to? I didn't find it in the excel. Could you please upload a screenshot?

Best regards,

Wendy

0 Hussein A over 3 years ago in reply to Wendy Wang1

Prodigy 80 points

Sorry RFB2 and RFB1 in the step 2 (Feedbacks Resistors) RFB2/RFB1 should be RFB1/RFB2 I think

0 Wendy Wang1 over 3 years ago in reply to Hussein A

TI__Genius 11370 points

Hi,

The calculator is correct. The FB is 2.5V. With the value of RFB1 and RFB2, we can get the Vout.

Best regards,

Wendy

0 Hussein A over 3 years ago in reply to Wendy Wang1

Prodigy 80 points

I am Ok with u the Vout is correct, but when we calculate the RFB2 from RFB1 isn't correct:

example: for giver (Vout=42 Volts, and RFB1=10Kohms) ===> RFB2=634ohms (DATASHEET) not 158Kohms (EXCEL), so the Step 2 should be RFB1/RFB2=15.8.

Best Regards
Hussein

0 Wendy Wang1 over 3 years ago in reply to Hussein A

TI__Genius 11370 points

Hi,

Both the calculator and the datasheet are correct. While for the datasheet, upper one is R1, lower one is R2. For the excel, upper one is R2 and lower one is R1. So you can't use the same equation.

Best regards,

Wendy

0 Hussein A over 3 years ago in reply to Wendy Wang1

Prodigy 80 points

AH ok, You are right sorry

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LM5010AQUICK-CALC: LM5010