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Low Voltage Power Supply

This document outlines the design specifications for a low voltage power supply for the Sounding Rocket Interface Board (SRIB) that Keith is developing. Key topics include the use of isolated DC-DC converters over linear regulators, PCB dimensions, and thermal management with copper heat sinks. Further inquiries to Keith address grounding strategies, communication protocol decisions (3-line serial vs. I2C), component isolation, current safety factors, op-amp buffers for DAC outputs, tolerances for rippling, and component trade-offs.

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Low Voltage Power Supply

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  1. Low Voltage Power Supply Molly, Gwyn, Sam, and Eric

  2. Answers from Keith • SRIB= sounding rocket interface board, which Keith is making • PEM= polarimeter electronics box (3 outputs) • A=analog, D=digital for outputs (not AC/DC!) • Isolated DC-DC converters are the best option, since linear regulators dissipate power as heat • The PCB should be about 6”x12” or smaller • Copper heat sinks work well in space due to conduction

  3. More Questions for Keith • Should ground for everything be chassis ground, or will isolated regulator outputs have floating ground? • Have you decided on 3-line serial vs. I2C? • Should all components specifically say “isolated?” We chose them as if they did. • What is the factor of safety for currents? • Can we use an op amp buffer for the DAC output rather than using variable regulators? Non-linear isolated variable regulators with enough current are hard to find. • How important are rippling tolerances? • What are your priorities as far as trade-offs go with components? • (List of part numbers we want to run by him)

  4. Part for +6V,-6V

  5. Other Parts from Murata

  6. Pert Chart

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