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Replacement 1st Gen Turn signal controller

posplayr said:
Not sure why you are using the bidirectional TVS? It has excellent ESD protection. But not sure why you need such a large parts (600W) for conducted transients. I guess they just come this size.
Click to expand...
It appears the DO-15 package TVS's only come in the higher wattage values.
The bidirectional was to protect from possible induced A.C. voltages from the ignition coils or if someone ran an electric motor such as a drill next to the TSCU.

I've been sensitive of it since the time I used a corded drill next to my car (which was equipped with an aftermarket remote start) and the vehicle cranked every time I pulled the trigger. :eek:
 
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rustybronco said:
It appears the DO-15 package TVS's only come in the higher wattage values.
The bidirectional was to protect from possible induced A.C. voltages from the ignition coils or if someone ran an electric motor such as a drill next to the TSCU.

I've been sensitive of it since the one time I used a corded drill next to my car (which was equipped with a aftermarket remote start) and the vehicle cranked every time I pulled the trigger. :eek:
Click to expand...

I was going to dig out that first reference. You would be better with the unipolar. It still provides the protection you want. In that ap note they basically explain that bipolar relates to the valid voltage ranges of the signal you are trying to pass, not the bipolar surge. In the SSPB all tvs's are unipolar all voltages are 0-12v.
Off hand the only bipolar signals are the stator a/c and ignitor waveforms.
I understand about the surges much more now; look up automotive "load dump". I'm not sure you need to worry about it for this but for the SSPB it was a driving issue.
 
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posplayr said:
You would be better with the unipolar. It still provides the protection you want. In that ap note they basically explain that bipolar relates to the valid voltage ranges of the signal you are trying to pass, not the bipolar surge.
Click to expand...
I did see that in the notes and have been trying to read as much as can on the subject (among other things). I already have been considering the change to a uni-polar particularly because of this statment...
A unidirectional TVS is best suited for protecting circuit nodes whose signals are unidirectional or always above or below the reference
voltage, usually ground.
Click to expand...

I already made one design change from the LM556CN to a NA556N because the LM is only rated 0? to 70? C. The NA556 is rated -40 to 105? C. I really would have loved to have found one that was rated at 150? but I'll take what I can get.
 
Drilled out and used a die grinder in an attempt to remove the epoxy(?) potting material so duplicates (or similar) could be made of the housing. This is now going to require a project box.
There's no way to save the old housing for reuse or duplication.

 
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