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Problem suply with adp1613 5V to +-15V to ADC3023

Niuton
on Nov 28, 2019 
Hello

I have designed the power circuit for the ADA3023 converter that is on page 21 of the data sheet, using an ADP1613 in a SEPIC-Ćuk topology with 5V input and + -15V output. as I see in the data sheet allow an output current of 2A.

The problem is that I want to feed
2 circuits OPA4277 and the ADC with this same source and when connecting the aged circuit, the current it consumes begins to rise and until the ADP1613 overheats. But if I do the same but eliminating the OPAs the system works well. with what I think does not have enough current to feed everything.

if it is true that this circuit I cannot use it to feed everything that alternative could use.

thanks
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    •  Analog Employees 
    on Nov 29, 2019 2:18 AM

    Hi

    The 2A is the inductor peak current. Output current is lower. You need to find out how much total current will be pulled by your load on both +15V and -15V outputs.

    Please look at better products ADP5070/71/72, LT3471 that can produce dual POS, NEG outputs.

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  • 0
    •  Analog Employees 
    on Nov 29, 2019 2:18 AM

    Hi

    The 2A is the inductor peak current. Output current is lower. You need to find out how much total current will be pulled by your load on both +15V and -15V outputs.

    Please look at better products ADP5070/71/72, LT3471 that can produce dual POS, NEG outputs.

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