Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

5v power supply startup delay #21

Open
LateralGs opened this issue Jul 23, 2019 · 0 comments
Open

5v power supply startup delay #21

LateralGs opened this issue Jul 23, 2019 · 0 comments

Comments

@LateralGs
Copy link

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.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

No branches or pull requests

1 participant