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Part Number: CSD18540Q5B
I’m trying to figure out if a MOSFET can handle a single current pulse for a given time duration, at a given VDS and at a given ambient temperature. The CSD18540Q5B for example.
I’m not sure I can just look at the SOA curve because I’m not sure if this curve only applies to devices at 25°C. How do I figure out if the device can handle the pulse (single) at 71°C?
Pulse handling requirements:
MOSFET technical information on ti.com here
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In reply to John Wallace1:
So it sounds like I can assume the part has enough thermal capacitance such that the case temperature is not changing during the pulse since we are using a constant 71°C case? Would this be true all the way up to a .1 second pulse?
Does the following look correct?
I think this part has a max junction of 175°C.
So for 71°case: (175°C-71°C)/(175°C-25°C) = .693 and for 105°case: (175°C - 105°C)/(175°C-25°C) = .466
So per SOA max current for 71°C case = .693 x 7.5A = 5.19A
per SOA max current for 105°C case = .466 x 7.5A = 3.5A
What was your math for getting the 7.5A?
In reply to Nicholas Layshot4:
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