LT8410-1 Booster Circuit Current Draw

Hi,

I'd like to get some support regarding Linear's LT8410-1 boost converter. 

More specifically I am measuring a large disrepancy between simulated current consumption (using LTspice) and the reality of my circuit. 

To be more precise the boost converter is set to convert about 3.4V to 13.25V or 26.5V. I am measuring about 150uA current drawn from my supply in the first case and about 3mA in the second case. LTspice simulates an average current draw of ~130uA in the first case and about 250uA in the second case. 

The situation is a bit more complicated but I would like to discuss this in private if possible with one of the support engineers.

Thank you for any support.

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  • Also Dulcevida,

    An additional note:

    Take a look at the end of the datasheet of Lt8410. Essentially this is the circuit I used. According to the efficiency vs load graph at 9uA load the efficiency should be about 40% with VIN=5V and VOUT=100V.

    This means that Iin=450uA.

    Would there be such a deterioration in efficiency from Vin=5V to Vin=3.4V to justify an 6 fold increase in input current?

Reply
  • Also Dulcevida,

    An additional note:

    Take a look at the end of the datasheet of Lt8410. Essentially this is the circuit I used. According to the efficiency vs load graph at 9uA load the efficiency should be about 40% with VIN=5V and VOUT=100V.

    This means that Iin=450uA.

    Would there be such a deterioration in efficiency from Vin=5V to Vin=3.4V to justify an 6 fold increase in input current?

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