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USB EZ-PD Type-C

MuIc_4620061
New Contributor II

Hi,

I would like you to have a look at following schematics and review/criticize/recommend.

It will be a UFP device with TFT-LCD display and buttons. Some blocks/components are displayed black, I don't know why.

Thanks.

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1 Solution
MaBr_2028236
New Contributor II

Hello,

I do have a recommendation for you.

You connected your sense resistor R9 between VBUS_IN and VBUS_OUT and the CCG3 controls the power input through the power MOSFETs Q1A / Q1B which are located between the same net names (VBUS_IN and VBUS_OUT). So the sense resistor is connected in parallel to the power MOSFETs which render useless the CCG3 control since current will always flow through the sense resistor.

I would rather connect the sense resistor in series with the control MOSFETs. Depending on where you want to read the current/voltage (input or output), it could be :

USB-C connector input --> VBUS_IN --> R9 --> VBUS_IN_SENSE --> Q1A/Q1B --> VBUS_OUT --> USB-C connector output

or

USB-C connector input --> VBUS_IN --> Q1A/Q1B --> VBUS_OUT --> R9 --> VBUS_OUT_SENSE --> USB-C connector output

I also wonder what will you be connecting to the USB-C PC Power Output connector? Will you be using a standard USB-C device with PD capability? If yes, you might encounter problem since the CC lines are left unconnected on the connector output.

Hope this helps,

Best Regards,

Martin

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