Post Go back to editing

lt3086 simple gated circuit won't turn on

Dear Sirs:

Dear Sirs:

     We have a simple gated regulator using an LT3086 DFN.   It’s output is set to 6V via a 110k res for Rset.   And Rset is shunted by .01uf cap.   Rmon is 392 ohms.  Have 10uf caps on in and out.

     Ref to attached circuit and waveform.  The circuit is gated on with a 3.3V pulse on /shtdn of 60ms duration.  It goes high to .2V briefly than goes low .6V as shown.

I haven't got a clue.

John M.20181210153446032.pdf

The initial load current is small.
[edited by: John7052 at 9:57 PM (GMT 0) on 10 Dec 2018]
Parents Reply
  • Well finally found the problem.  Had a processor pin connected to the temp output on the LT3086.   But it was mistakenly configured to be an output at 0 faulting the temp circuit.  So the port pin was shorting out the LT3086 chip's temperature output and causing it to malfunction.  Took me long enough.