ADP1031 application

Test conditions:

input power : 24VDC

VOUT1 isolate output is 24VDC

VOUT2 isloate ouput is 5V

VOUT3 output is -15V

question:

why is the output of VOUT3  very low voltage,but The output voltage of VOUT1 and VOUT2 is correct.??What are the possible causes of this problem??The ouput voltage of FB3 pin is very low too.



question: why is the output of VOUT3 very low voltage,but The output voltage of VOUT1 and VOUT2 is correct.??What are the possible causes of this problem??
[edited by: ADP1301 at 3:04 AM (GMT -4) on 25 Jun 2021]
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    •  Analog Employees 
    on Jul 1, 2021 2:07 AM in reply to ADP1301

    Hi,

    That's great that the -15V is now working. The -15V of the ADP1031 powering the AVSS of the AD5758 having the GNDs in common should work fine. Can you have a look in the AD5758 section especially the AVSS rail, perhaps this rail connects to the GND in some point. May I know what happened when you put back the AD5758, does the system works as intended? 

    Thanks.

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