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LM61460: Thermal issue causing device to burn up

Kevin Lai
Intellectual 2916 points
Part Number: LM61460

Hi team,

my customer is having an issue where the device burns up with a 3A continuous load current. 

they are currently using a 50 x 50mm board size at 2 layers. can this device function up to 4.5A continuous current with this current design?

also, why is the chip disregarding the thermal shutdown feature and burning up?

I have the schematic and layout to share via direct email. please reach out to me for further discussion.

input voltage = 27V

output voltage = 16-24V

output current = 1.5-4.5A depending on load 

Thanks,

Kevin

  • 0
    TI__Mastermind 25590 points

    Kevin,

    A good 4-layer layout at 50x50mm should be no more than ~30C/W. 2-layers makes it tougher. Please share the schematic, layout, ambient temp, and any other info you have with me through email or direct message and I'll review.

    It is strange that the device appears to be ignoring thermal shutdown. Do they have a thermal camera? What's the case-top temp? And how exactly does the device break?

    -Sam