On Tue, 04 Aug 2009 22:44:22 -0700, Robert Baer
wrote:
Jim Thompson wrote:
On Tue, 04 Aug 2009 01:29:55 -0700, Robert Baer
wrote:
Samples of the "N" peak in a shunt regulator attached.
That's NOT a TL431, nor is 171° remotely in the specified range of
operation.
...Jim Thompson
It does not matter what the designation given to a bandgap based
regulator is; what matters is how it may (or may not, depending on
temperature) work.
The various bandgap based regulators run from low power microamp to
"power hog" multi-milliamp specs.
A few act-up like that shown, others show hysteresis and oscillation
as temp goes up, some show more "leakage" before regulation, etc & etc.
No one "class" (eg: low power) has an "edge" on another - no matter
what that so-called edge may be (goofiness at high temp).
Methinks i mentioned that the particular TL431s should be carefully
tested with a curve tracer.
Believe what you like. From '77 to '87 I used (TI) TL431 by the
bucket load. NEVER had a single failure.
...Jim Thompson
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