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L4960 question - PTC fuse cuts the input voltage

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brunofunchas

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Hello!

I have an electronic board where the "fuse" X60X050( I think it is an 500ma 60V PTC) cuts out the supply to input pin 1 of an IC L4960.

I have a peak current of 2,45A before it cuts out in less than 2 sec. I think my problem is on this fuse, since the datsheet states that it should hold that current during 4 sec.


I have measured the resitance to ground from pin1 of L4960 an it around 150 kilo ohms.

Should I change the PTC or I missing something on the diagnostic?

Thanks,
Bruno
 

I think my problem is on this fuse, since the datsheet states that it should hold that current during 4 sec.
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Your problem is with reading. The datasheet specifies very clearly (minimal) Itrip of 1A and maximum time to trip of 4s@2.5A.Typical ("average") time to trip at 2.5 A is less than 2s according to curve. There's no exact specification for tolerable duration of peak current above 1 A. So it looks like you should change the PTC.
 
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