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Need help using TL2575 Switching Regulator

G Jayaprakash64189
Prodigy 10 points

Dear friends, I use Texas TL2575HV-12IKTTR to convert 21Vdc to 12Vdc and then feed this to a CCTV camera consuming about 550mA at 12Vdc. My problem is that the regulator gets overheated (above 100 degrees C) for this current well below the rated 1A. I used the application circuit prescribed in the TI datasheet page number 3. I have a faint idea that employing a different inductance value/type may reduce the heating within limits. Friends, I would be very glad if someone of you can guide me with your suggestions or ideas towards solving the problem ? Thanks a lot in advance!

  • 0
    TI__Guru**** 165146 points

    Hello G Jayaprakash.

    Sorry for the delay in answering.

    There are two likely causes.
    1)  Poor efficiency
    2)  Insufficient heat sink

    For item 1, measure the input and output voltages and currents then calculate power loss and efficiency.  Regarding item 2, what type and size heat sink are you using?

    Do any of the other components get hot?
    Does the signal on pin2 look good? (clean 20V and -1V)

    Regards,
    Ron M.