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LM5116: high-side synchronous MOSFET and low-side synchronous MOSFET intermittently burn out

Part Number: LM5116
Other Parts Discussed in Thread: CSD19533Q5A

Tool/software:


The LM5116 was used to design a power source circuit to control the flashing of a high intensity AWL (Abiation Warning Light). The LM5116 schematic is shown below.

The circuit appears to be functioning normally.

However, the high-side synchronous MOSFET and low-side synchronous MOSFET intermittently burn out after prolonged aging.

For reference, the MOSFETs used are shown below.

   * High-side MOSFET : TI  / CSD19533Q5A

   * Low-side MOSFET : Infineon / BSC070N10NS3 G

I would like to know if there is a problem with the schematic or component specifications.