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gab-k / RP2040-Decoder

Cost effective DIY DCC Decoder for model railroad locomotives
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LDO problem #23

Closed gab-k closed 7 months ago

gab-k commented 8 months ago

Discussed in https://github.com/gab-k/RP2040-Decoder/discussions/17

Originally posted by **hebalazs** December 20, 2023 Hello, this is the first time I am using this project. I have some pieces of decoders. For programming, I use another open-source project (DCC-EX), and some of my decoders have died (RP2040 has a short circuit inside) due to the incorrect operation of the LDO. I measured the LDO voltage and observed a 7V peak during power-on. Currently, I have replaced the LDOs with [MCP1799T-3302H/TT](https://ww1.microchip.com/downloads/en/DeviceDoc/MCP1799-Data-Sheet-20006248A.pdf). It has the same package, and it has thermal and current protections. Now it seems the decoder is working properly. Have you experienced similar problems? ![IMG_4879](https://github.com/gab-k/RP2040-Decoder/assets/8313379/3a1b0513-9fca-49ce-86dc-9e7bdcb5135e)

Please read the discussion above. I would not recommend using the PJ75AL33SA at the moment. Please choose an alternative SOT-23-3 3.3V LDO with similar specifications. Some regulators were already suggested by others and will probably work fine.

gab-k commented 7 months ago

see https://github.com/gab-k/RP2040-Decoder/commit/bfa58bf5d6481cf426acf345e884aa84d8e5c236