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Original question:

SN6501: SN6505A: About disorder of switching issue

SN6501: Spike current

Anjana Gopinath
Prodigy 105 points
Part Number: SN6501
Other Parts Discussed in Thread: SN6505A

Hi,

I changed the transformer with better volt second product after the conclusions previously in the thread.

We tested the push pull converter @125'C the primary current increased to 700mA. I realized that the schottky diode operating junction temp was 125'C.

I replaced IN4007 diode just to check if the system would work fine. I observed a repetitive current spike (as in attached pic).

The device dint shut down, and the current consumed from the source is 150mA. I was trying to know the reason for the spike.

Can you please help?

Regards,

Anjana G

  • 0
    TI__Genius 17100 points

    Hi Anjana,

    Thank you for including these waveforms in your post. What are part numbers for both the new diodes and selected transformer?

    From the second image, it seems the switching frequency is ~160kHz. Is the SN6505A being used here?

    SN6505 devices have internal current limits and thermal shutdown protection features, which limit the device's operation in short-circuit or excessive temperature conditions. Please share the information above and let us know the expected current load (on the secondary side) and output voltage or transformer turns ratio.


    Best,
    Manuel Chavez