Fix brown out on radio enable

oresat / oresat-c3-hardware

C3 (Command, Communication, and Control) our Command and Data Handling (C&DH) card.

Other

14 stars 7 forks source link

Fix brown out on radio enable #59

Closed andrewgreenberg closed 8 months ago

andrewgreenberg commented 10 months ago

When turning on v6.0 radio power, the Octavo resets due to a brown out.

Change the dv/dt resistor of the TPS, or change it back (see cesar's changes)
Add more capacitance on the input of the system (C6) - maybe double
Add more caps to the VIN_AC - maybe double
Add individual enable lines to 3.3V LDOs from GPMC_A0 to UHF and GPMC_A3 to L BAND.

andrewgreenberg commented 9 months ago

Connected 3.3V LDO enables. Also look into more caps and the TPS's dv/dt.

andrewgreenberg commented 8 months ago

Separate enable lines added on the LDOs. Added 22 uF added to VBUS. Added 22 uF to VIN_AC. TPS capacitor didn't help, still browned out, because the LTC kicks in after the initial voltage ramp up.