4
\$\begingroup\$

I am using a TI LM4510 converter (datasheet) to step up from 5V to 12V (adjustable). I have good input power, enabled chip, and followed datasheet, but the output voltage is actually lower than the input. I've attached the schematic and board footprint. Any ideas on what's going on?

Thanks in advance!

Schematic

Footprint

\$\endgroup\$
9
  • \$\begingroup\$ You checked that the EN pin is actually pulling high? For some types of logic (and the logic in a device like this might not conform to any particular standard), 100k is too weak a pull-up to reliably reach a logic high. \$\endgroup\$
    – The Photon
    Commented Jul 23, 2016 at 1:48
  • \$\begingroup\$ yes, Vin and enable pins are both 4.5V \$\endgroup\$
    – jgaro
    Commented Jul 23, 2016 at 1:53
  • \$\begingroup\$ is it a commercial board, or your own layout, do you have confidence in it is what I mean? \$\endgroup\$
    – Neil_UK
    Commented Jul 23, 2016 at 5:21
  • \$\begingroup\$ This is a new board, so you are correct that it's unproven...which is why I'm asking on here. \$\endgroup\$
    – jgaro
    Commented Jul 23, 2016 at 5:26
  • \$\begingroup\$ Place the link as normal text and someone will hyperlink it for you. \$\endgroup\$
    – winny
    Commented Jul 23, 2016 at 8:07

0

Reset to default

Browse other questions tagged or ask your own question.