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LM3409HV: driver chips immediately burns after power supply connection

Max Trybunksyi
Prodigy 70 points
Part Number: LM3409HV
Other Parts Discussed in Thread: LM3409,

Good day, 

we faced an issue with a LED driver design that we made for tests. After the power is connected to the board, the LM3409 chip burns off. We looked closely at the chip and it seems that something was damaged in the power area of the chip as the package is destroyed around pins 5-10. We can't see any obvious mistakes in the design or wrong footprint and the only thing that was slightly customized is a shunt-dimming circuit. 

VIN = 48V
VOUT = Floating 
SW1 was set to "3-2: External PWM (Shunt FET)"

Do you have any idea why the LM3409HV can blow up like that? 

Attached are the schematic, layout, and PCBA photo. 

Thanks in advance.
 8473.Layout.PDF

Schematic - LED_DRV_REV1.0.PDF

  • 0
    TI__Genius 15780 points

    I didn't find significant error in the design. Can you just rise up power supply slowly to the voltage that device starts to work and capture waveforms? 

    If it burns even when power supply is added, you may capture pins waveforms with supply voltage triggered. 

    BR, 

    XG