madhu.a

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February 26, 2020 at 1:21 pm in reply to: OSD3358-512M-BSM powers up from USB but not VIN_AC #9913
madhu.a
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That was it. The rise time from my lab supply was around 60ms to go from 0 to 4.5V. Just enough to screw things up looks like. A different supply with a 30ms rise time took care of the issue. I can now see the ‘CCC’ on my debug powered either from USB or VIN_AC.
Thanks for all the help guys!
February 26, 2020 at 11:12 am in reply to: OSD3358-512M-BSM powers up from USB but not VIN_AC #9911
madhu.a
Participant
Thank you for the tips Neeraj. I am going to take the measurements you suggested and get back to you.
February 26, 2020 at 10:06 am in reply to: OSD3358-512M-BSM powers up from USB but not VIN_AC #9905
madhu.a
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sorry – the .bmp file was rejected. Trying a .png file..
Attachments:
1. SDS00001.png
February 26, 2020 at 10:04 am in reply to: OSD3358-512M-BSM powers up from USB but not VIN_AC #9904
madhu.a
Participant
I checked to make sure I have 5.1V after the protection circuit (bumped up the lab supply to 5.2). I see just a 18mA draw on the lab supply. I have attached scope capture of the VIN_AC rail probed right at C1. Can’t figure this out…
Thanks for your help!
February 26, 2020 at 9:22 am in reply to: OSD3358-512M-BSM powers up from USB but not VIN_AC #9900
madhu.a
Participant
Thank you Eric.
I have a 220uF tantalum at the input to the VIN_AC power rail and another 220uF on the SYS_5V(snippet of the schematic attached). Did you have to add more?
Appreciate you taking the time to reply.
Attachments:
1. Processor_Power.png
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madhu.a

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