SNVAA63 March   2023 TPSM365R6

 

  1.   Abstract
  2.   Trademarks
  3. 1Inverting Buck-Boost Topology
    1. 1.1 Concept
    2. 1.2 Output Current Calculations
    3. 1.3 VIN and VOUT Range in Inverting Configuration
  4. 2Design Considerations
    1. 2.1 Additional Bypass Capacitor and Schottky Diode
    2. 2.2 Start-up Behavior and Switching Node Consideration
  5. 3External Components
    1. 3.1 Capacitor Selection
    2. 3.2 System Loop Stability
  6. 4Typical Performance
  7. 5Digital Pin Configurations
    1. 5.1 Digital Input Pin
    2. 5.2 Power-Good Pin
  8. 6Conclusion
  9. 7References

1.3 VIN and VOUT Range in Inverting Configuration

In the standard configuration, the TPSM365R6 IC can tolerate a 65 V difference between its VIN and IC GND pins. In an IBB, however, TPSM365R6 IC GND is referenced to the negative output voltage pin, –VOUT, see Figure 1-1. The TPSM365R6 will experience a potential difference of VIN to –VOUT between its VIN and TPSM365R6 IC GND pins, which effectively limits the input voltage range of the TPSM365R6 module in its inverting buck-boost configuration. For example, for an output voltage of –12 V, the maximum input voltage will be 53 V, as this results in a 65 V potential difference between the TPSM365R6 IC's VIN and GND pins. The output voltage range in the TPSM365R6 IBB topology is –1.8 V to –13 V.