LMZ34002: LMZ34002: Webench design error for Rset.

Matthew Bradshaw

Part Number: LMZ34002

To set an output voltage of -15.5V, Webench recommends a 205k resistor for Rset. (11-34V input, -15.5V output, 60C operating temp)

The datasheet specifies using 187k resistor for Rset to get -15.5V output.

See Table 3 of the datasheet.

Please advise.

over 4 years ago

+1 iAlejandro over 4 years ago

TI__Expert 8130 points

Hello Matthew,

Please use the value(s) shared on Table 3 of the datasheet.
Thanks for bringing up the following information. I will make sure to notify the internal team of this bug.

Regards,
Alejandro

0 Matthew Bradshaw over 4 years ago in reply to iAlejandro

Prodigy 20 points

Thank you Alejandro.

I noticed in the webench design, any output voltage between -15.5 to -17 would give an Rset value of 205k. Lowering the output voltage to -15.0V gave the correct Rset resistor value.

Thanks
Matthew

0 iAlejandro over 4 years ago in reply to Matthew Bradshaw

TI__Expert 8130 points

Thanks for sharing! I'll make sure to notify the team.

Kind regards,
Alejandro

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LMZ34002: LMZ34002: Webench design error for Rset.