SDAA341 June   2026 F28377D-SEP , INA901-SP , SN54SLC8T245-SEP , TPS7A4501-SP , TPS7H1121-SEP , TPS7H1121-SP , TPS7H5020-SEP , TPS7H5020-SP , TPS7H6101-SEP

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Detailed Description
    1. 2.1 Design Concept
  6. 3Hardware Design Details
    1. 3.1 Power Stage
    2. 3.2 Current Sense
    3. 3.3 Temperature Monitoring
    4. 3.4 Area Estimate Per Power Stage
    5. 3.5 Connecting the F28379D LaunchPad
    6. 3.6 Software Design
  7. 4Results
    1. 4.1 Thermal Performance
  8. 5Summary
  9. 6References

3.2 Current Sense

The in-phase current sensing circuitry based on the commercial-grade INA240A1 was carried forward from BOOSTXL-3PHGANINV to keep the space-grade power stage as close as possible to its parenting design configuration for easy board bring-up with minimal software changes.

A high-side current sense option based on INA901-SP was added as it is typically used in stepper drives and in some cases also in three-phase motor applications for the benefit of a ground-fault detection capability (Figure 3-4). INA951-SEP would be recommended if lower radiation hardness is required such as in LEO constellations.

High-Side Current Sense Option Based on INA901-SP Figure 3-4 High-Side Current Sense Option Based on INA901-SP

Alternative space-grade in-phase current sensing solutions from TI are available based on INA951-SEP or INA901-SP with a constant current source added ( Bidirectional Topologies for the INA901-SP), OPA4H199-SEP/-SP for up-to 40V common mode input voltage, or INA1H94-SEP/-SP combined with OPA4H199-SEP/-SP or OPA4H014-SEP for common mode input voltages from -150V to +150V.