LM3429 - OVP treshold

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Posted by Tiziano DePaoli

on Apr 13 2012 05:51 AM

Hi.

In a input voltage broad range design (15V - 70V), I saw a OVP internal reference variation from 1.24V to 1.4V when the input voltage is higher than 18V. This is could be a problem if there is a large LED string with the Vf sum close to regulator voltage limit. The 11% error measured causes an OVP lockout over the voltage rating device with possible damage. Do you have any suggestion regarding this issue?

I noted also that the OVP input is very sensible to the capacitor value to put in parallel to Rov1. Is the 47pF the best value to use?

Best regards.

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