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High power consumption of DC/DC converter during startup #69

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RobertGawron opened this issue Jul 7, 2019 · 4 comments
Closed

High power consumption of DC/DC converter during startup #69

RobertGawron opened this issue Jul 7, 2019 · 4 comments
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@RobertGawron
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bug Something isn't working hardware Topics that require changes in HW or needs HW interactions (oscilloscope, multimeter, etc.). question Further information is requested.
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v4.0
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4.0

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@RobertGawron
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Check if removal/decrease of C39 will help.
@RobertGawron RobertGawron added bug Something isn't working hardware Topics that require changes in HW or needs HW interactions (oscilloscope, multimeter, etc.). labels Jul 7, 2019
@RobertGawron RobertGawron added this to the 4.0 milestone Jul 7, 2019
@RobertGawron RobertGawron self-assigned this Jul 7, 2019
@RobertGawron RobertGawron added this to To do in v4.0 via automation Jul 7, 2019
@RobertGawron RobertGawron moved this from To do to In progress in v4.0 Jul 7, 2019
@RobertGawron RobertGawron added question Further information is requested. and removed bug Something isn't working labels Jul 7, 2019
@RobertGawron
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Removing C39 doesn't solve the problem.

Around 200mA is needed on startup, when current limit is set to 100mA, converter doesn't work.

@RobertGawron
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Removing C41, C43 doesn't help either.

What's interesting removing C2 makes issue permanent.

@RobertGawron RobertGawron pinned this issue Jul 8, 2019
@RobertGawron RobertGawron added the bug Something isn't working label Jul 8, 2019
@RobertGawron
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After discussion with a colleague, it seems that current design might be completely wrong, pin1 should be an output and pin1 should be grounded.

Maybe. I don't know.

This is a time consuming case to verify because all components are SMD. I will leave it as it is and make place to configure it on further version of PCB. Especially because I don't know if this DC/DC converter will fit at all due to it's potential electro-magnetic pollution.

Reference: https://www.onsemi.com/pub/Collateral/MC34063A-D.PDF

@RobertGawron RobertGawron moved this from In progress to To do in v4.0 Jul 14, 2019
@RobertGawron
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DC/DC converter won't be used.

v4.0 automation moved this from To do to Done Aug 15, 2019
@RobertGawron RobertGawron unpinned this issue Aug 15, 2019
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bug Something isn't working hardware Topics that require changes in HW or needs HW interactions (oscilloscope, multimeter, etc.). question Further information is requested.
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@RobertGawron