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  1. M

    PWM circuit with a mind of its own...

    Wow the list grows! I read through section 5.4 of the controller data sheet and was under the impression I could get away without in this instance.
  2. M

    PWM circuit with a mind of its own...

    Ha sorry sloppy wording - I mean perhaps the possible problems you suggest are providing a momentary condition for the IC the latch-up. Apart from the fan controller latching up, I can't see a route by which the circuit will sustain itself in a mode of failure? Back diode on the fan 10mH...
  3. M

    PWM circuit with a mind of its own...

    @hevans Here is a pic with the values - yes I labelled the op amp backwards. I did consider those sections but eventually came to the conclusion that they shouldn't be affecting me. However, perhaps something in Harald's explanation could trigger a latch-up condition. Sadly I don't have access...
  4. M

    PWM circuit with a mind of its own...

    Hi all, Thanks a lot for your inputs - really appreciated! @Alec Yes it is a logic level MOSFET (I was a bit out of my depth choosing a MOSFET, but went with this one) I didn't include a diode as I didn't see one in the examples given in the datasheet, happy to add one, but I'm not sure that...
  5. M

    PWM circuit with a mind of its own...

    Hi all, newbie here, I've just joined the forum as I've been pulling my hair out over this one for too long! Scenario is as follows: I have a large bar fridge, which uses two noisy 12V fans to cool its heat sink. First of all I added an SSR so that the fans only run when the compressor is...
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