rhd
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I bought three Ben boost driver from Mohrenberg. Two of them are build in the dual driver setup. I have a problem with the third driver.
When I turn up the input voltage the current increases and if the voltage is dropped then the current decreases. It is basically a resistor. I think the driver is defect. What component can I change to repair it ?
You should put comments like this ^ in Moh's thread, because they deal with (potentially) a defect in the assembly of one of his drivers, not a problem with the design itself (what this thread is about).
Though I would add, that this is probably exactly what you would expect as behavior from a boost driver.... what's weird about that?!?!?
If the voltage is low, then the BOOST driver is going to struggle (and not be able) to provide the full output current at the voltage it needs to boost too. As you start to increase voltage of your input, then the driver has to do less boosting, so it can start providing more current up to the point of reaching it's intended output current. Once you provide adequate input voltage, and enough current, for the driver to hit its current output target, then your output current will stay constant. If you start decreasing voltage, then the driver just backs down into the same scenario, where you're no long supplying a sufficient input for it to boost up to the required output voltage at the set output current.
At least based on the behavior you've described, this just sounds to me exactly how a boost driver would normally behave when you're stingy on the voltage.
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