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Originally Posted by Dale
It's feeding into an optoisolator in each Talon
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Most likely so*. If there's a schematic, I haven't been able to find it.
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out of a 330 ohm resistor in the DSC
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Yes. There's a schematic for this.
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The PWM output can source or sink 15ma.
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With a dead short, yes.
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Most optoisolators turn on around 1.6ma
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The spec is available for the Jag, and
it is guaranteed to turn on with 1.6 ma.. Since there's a 150ohm series resistance and a voltage drop across the LED, it requires about 1 volt to push that 1.6 ma through the LED.
So if you drive 3 Jaguars being driven by one DSC PWM port:
5 - 330*i - (150/3)*i - 0.7 = 0
. . . =>
.. i=11ma
.. =>
.. 3.8ma per Jag
So it should work for 3 Jags... but I'm not sure about that 0.7 number; couldn't find a spec.
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We've driven three Talons before with no issue but Mike might have thoughts about whether it's likely to be on the hairy edge.
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If you're reading this Mike, any info you'd be willing to provide would be appreciated. Don't want to speculate.
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http://www.chiefdelphi.com/forums/showpost.php?p=1127215&postcount=3