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LT1568 Short Circuit

Thread Summary

The user designed multiple filter configurations using the LT1568 on a custom board and encountered excessive current draw, potentially short-circuiting the IC. The final answer requests details on supply voltages, current draw, repeatability, component values, and connection checks to diagnose the issue.
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Category: Hardware
Product Number: LT1568

I have designed multiple filter configurations using the LT1568 on a custom board. When I try to power them, I get excessive current draw, saturating the regulator. So it looks like the IC is short circuiting somehow. I have followed the design guide in the EVB user manual to build a 4th order elliptic LPF at 250kHz cutoff:

I cannot see any differences in my circuit to the example that would cause excessive current draw

  • Hello ,

    Apologies for missing this. Can you please answer the following questions:

    1. What are your supply voltages?
    2. How much current is being drawn?
    3. Is this repeatable on multiple boards? Have you used the DC675C evaluation board and encountered the same issue?
    4. On your board, could you check whether all the component values match your expected specifications.
    5. Lastly, please check all your connections to ensure that no components have accidentally shorted, as this can significantly contribute to excessive current draw.

    Thank you!

    Regards,
    Paul