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Increase value of C113 to increase time constant for startup. This will allow output of up stream power supplies to stabilize before we turn on our switching supply.
With up stream supplies that are current limited the immediate inrush causes them to go into a current limited state which then browns out the switcher on the marionette with its output fet turned on shorting to ground. This stays in this state until power is removed. If connecting power after the up stream supply's output is stable does not produce this issue due to its output capacitance handling the inrush to our switcher.
Tested with value ~10uF which powers up fine from a lab supply.
The text was updated successfully, but these errors were encountered:
Board rev: 2.2
Increase value of C113 to increase time constant for startup. This will allow output of up stream power supplies to stabilize before we turn on our switching supply.
With up stream supplies that are current limited the immediate inrush causes them to go into a current limited state which then browns out the switcher on the marionette with its output fet turned on shorting to ground. This stays in this state until power is removed. If connecting power after the up stream supply's output is stable does not produce this issue due to its output capacitance handling the inrush to our switcher.
Tested with value ~10uF which powers up fine from a lab supply.
The text was updated successfully, but these errors were encountered: