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LM5008: What is happened on LM5008 when a fast recovery diode has higher trr than 30ns?

Kazuya Nakai59
Guru 20600 points
Part Number: LM5008

Hello guys,

One of my customers uses LM5008 for their mass-production of a product.

At this moment, they have the following questions.
Could you please give me your reply?

Q. 
The fast recovery diode (D1, placed between SW pin and GND) they use will be EOLed.
They want to replace the diode with other fast recovery diode which is used for their other products.
But this fast recovery diode has higher trr than 30ns.
What is happened on LM5008 when a fast recovery diode has higher trr than 30ns? 

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    TI__Genius 12045 points

    Hi Kazuya,

    Thank you for your question. The reverse recovery time will determine how long the reverse current surge lasts every time the buck is turned on. This needs to be less than 50 ns as the current limit sensing circuit is only blanked for the 50-70 ns of each on-time to avoid falsely tripping the current surge. The lower the Trr the better. Also please ensure that the reverse voltage rating is at least as large as the maximum VIN and the current rating is greater than 610 mA.