SNOAA79 June   2021 DAC121S101QML-SP , LMP7704-SP , TPS7A4501-SP


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Design Notes

  • Use a high-precision and low-drift resistor for RSense.
  • The RSense power rating should be considered to ensure that no failures occur at the desired current load.
  • If a large resistive load is present, a separate high-voltage supply may be used for driving the current to the load.
  • The LMP7704-SP supply voltage of 5V was selected according the derating specifications provided by the National Aeronautics and Space Administration (NASA) in document EEE-INST-002 (April 2008) and the European Cooperation for Space Standardization (ECSS) in document ECSS-Q-ST-30-11C Rev.1 (4 October 2011). The documents specify a derating of the absolute maximum supply voltage for linear ICs to at least 80% and 90%, respectively.
  • For proper operation, the power supplies must be decoupled. For supply decoupling, TI recommends placing 10-nF to 1-µF capacitors as close as possible to the op-amp power supply pins. For the single supply configuration shown, place a capacitor between the V+ and V– supply pins. Bypass capacitors must have a low ESR of less than 0.1Ω.