[SI-LIST] Re: waveform analysis
- From: Dennis Tomlinson <det_werks@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 12 Dec 2003 04:59:11 -0800 (PST)
Munish,
Both test cases will product the same average operating temperature. Case #2
will
produce the highest peak operating temperature. There is, however, one more
parameter
to consider -- that being the thermal mass of the diode and the medium to which
heat is conducted away. Equivalently, what is the thermal time constant. If long
compared to the on time of your longest pulse, there will be little difference
between
peak and average temperature, and therefore no interesting differences in
device
temperature between your two cases.
Dennis
munish <munish.gupta@xxxxxxxx> wrote:
12 DEC 03
Hello experts:
A diode is to be subjected to a TWO different pulses:
1) Rectangular wave , duty cycle:5% , ton =0.5us
2) Rectangular wave : duty cycle :5% , ton =10ms
Which pulse is more stringent . Choice goes for # 2 since device handles
current for MORE time but my worry is it also gets MORE time to COOL.
Assume same amplitude of current and same thermal resistance values in both the
cases.
regards and thanks in advance
munish gupta
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