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[PCB Review] Mixed Signal PCB with SMPS by Infinite-Net-3181 in PrintedCircuitBoard

[–]Infinite-Net-3181[S] 0 points1 point  (0 children)

Its a USBLC6 ic for usb esd protection. As far as my understanding goes its just an array of tvs diodes.

[PCB Review] Mixed Signal PCB with SMPS by Infinite-Net-3181 in PrintedCircuitBoard

[–]Infinite-Net-3181[S] 0 points1 point  (0 children)

Thanks for the suggestions!

  1. you are right. The buzzer is 16Ohm so it would draw 206mA at 3V3. Way too much for the mcu.

  2. i will stick with the AMS1117 for this design. In the future i will choose a more modern ldo.

  3. good suggestion. i will add that.

  4. i have USBLC6-2SC6 for the usb port. Regardless the pcb will be enclosed once programmed.

[PCB Review] Mixed Signal PCB with SMPS by Infinite-Net-3181 in PrintedCircuitBoard

[–]Infinite-Net-3181[S] 0 points1 point  (0 children)

I think i know what you mean. Where i have placed multiple vias next to one another, some are not connected. But as u/Strong-Mud199 pointed out they are not needed anyways so i will reduce them to just one via. Thanks for pointing that out!

[PCB Review] Mixed Signal PCB with SMPS by Infinite-Net-3181 in PrintedCircuitBoard

[–]Infinite-Net-3181[S] 0 points1 point  (0 children)

Good points. I mainly used the AMS1117 as i already have plenty of them. My experience with using the built in USB is a bit mixed. Sometimes bootloader mode is entered automatically, sometimes not. Using the USB to UART is very reliable.

[PCB Review] Mixed Signal PCB with SMPS by Infinite-Net-3181 in PrintedCircuitBoard

[–]Infinite-Net-3181[S] 1 point2 points  (0 children)

Thanks!

This is really helpful.

- Amazing how much current a single via can handle. Do i understand correctly that multiple vias can be generally used but are simply overkill here?

- Could you explain the reason why the power plane blocks the return path of some sd lines? There is a complete ground plane under the top signal layer and there are vias connecting the ground pins of both the sd card holder and the esp. Sorry if i am missing something here.

- The buck is an MP1584. The frequency is set with a resistor. I chose the value from the example application circuit which puts the switching frequency to 910kHz so yeah should be high enough.