The maximum input voltage that can be applied to the LM5575MHX is 42V, but it's recommended to keep it below 40V for reliable operation.
To ensure the LM5575MHX operates within its thermal limits, make sure to provide adequate heat sinking, keep the ambient temperature below 85°C, and avoid high power dissipation.
Yes, the LM5575MHX is qualified for automotive and high-reliability applications, but you should consult the Texas Instruments Automotive or High-Reliability documentation for specific requirements and guidelines.
To minimize EMI, follow good PCB layout practices, such as keeping the input and output traces separate, using a solid ground plane, and placing the LM5575MHX close to the input capacitors.
The recommended input capacitor type is a low-ESR ceramic capacitor, such as X5R or X7R, with a value of 10uF to 22uF.