wiki:DosiRackMountHardwareDebug

ADC ECO List

  • Change R25 to 20k
  • Connect PWR_EN to VADJ

2018-04-12

  • PWR_EN not driven on ADC board. Trace accessible on bottom layer.
    • Input V: TPS54428 1.6V - 18V. LP3874 2 - 7V.
    • So, can use VAdj.

Power up. Draws around 220mA on 12V. All voltages OK except 6V is about 5V.

Looking at R24/R25. It's wrong, programmed for 5V. To fix, replace R25 with 19.4k (20k is ok).

On proto, put 100k in series with R25.

Last modified 5 years ago Last modified on Apr 12, 2018, 4:35:38 PM