SLVAG21 April   2026 TPS61381-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Overview
    1.     6
    2. 2.1 Design Considerations
    3. 2.2 System Design Theory
      1. 2.2.1 Supercapacitor Charging Operation
        1. 2.2.1.1 Calculation for Backup Supercapacitor Selection
          1. 2.2.1.1.1 Design Calculations
  6. 3Test Results
    1. 3.1 Standby Operation
    2. 3.2 Charging Operation
    3. 3.3 Boost Operation
  7. 4Summary
  8. 5References

3.2 Charging Operation

The supercapacitor charging operation is shown in Figure 3-2. As soon as the mains supply of 12V is present, the capacitor starts being charged through the internal regulator. At the programmed voltage level of 2.7V per supercap, the converter voltage goes low and the converter stops charging the supercapacitor.

Charging with Vin at 12VFigure 3-2 Charging with Vin at 12V