SNVAAB6 March   2026 BQ76907-Q1 , LM5190-Q1 , TPS55287-Q1

 

  1.   1
  2.   Abstract
  3. 1Introduction
    1. 1.1 Function and Significance
    2. 1.2 Regulatory Requirements
  4. 2System Architecture
    1. 2.1 CPM Structure and Application Challenges
    2. 2.2 Main Functional Units
  5. 3Critical CPM Parameters
    1. 3.1 Basic Parameters of 3s and 5s Supercapacitors
    2. 3.2 Door Unlock Motor Parameters and Power Consumption Calculation
    3. 3.3 Charging Time Requirements
  6. 45s System Scheme
  7. 53s System Scheme
  8. 6Summary
  9. 7References

5 3s System Scheme

The table below presents an example of the system requirements for a 3s supercapacitor CPM:

Charging Time 60s
Total Supercapacitor Capacitance 8.33F
Supercapacitor Operating Voltage Range 3~7.5V
System Input Voltage Range 9~16V
Motor Operating Voltage Range 9~16V
3s Supercapacitor System Block DiagramFigure 5-1 3s Supercapacitor System Block Diagram

The TPS61383-Q1 is a bidirectional buck/boost converter equipped with battery health monitoring capabilities. The backup battery side can support an input voltage of up to 12V and accommodates up to 4 series-connected supercapacitor cells. When the 12V main battery operates normally, the TPS61383-Q1 charges the supercapacitor via its buck mode, delivering a maximum charging current of 7A. In the event of a 12V main battery failure, the TPS61383-Q1 automatically switches to boost mode by detecting a drop in the main battery terminal voltage. It elevates the supercapacitor voltage to 12V to power the motor, with a maximum input-side current capability of 30A. Simultaneously, the TPS61383-Q1 supports a battery health monitoring feature that evaluates the capacitance of the supercapacitor to determine its state of health (SOH). Compared to discrete solutions, the TPS61383-Q1 offers a higher level of integration, a smaller solution footprint, and a simplified design.

Table 5-1 TPS61383-Q1 Voltage and Current Waveforms during Charging under Different Input Voltages
Charging Process at VIN = 12VFigure 5-2 Charging Process at VIN = 12V
Charging Process at VIN = 16VFigure 5-3 Charging Process at VIN = 16V
Charging Process at VIN = 9VFigure 5-4 Charging Process at VIN = 9V

Table 5-1 illustrates the charging current profile of the TPS61383-Q1 when the 12V main battery voltage is at 12V, 16V, and 9V, respectively. As observed, the charging profile of the TPS61383-Q1 is divided into two distinct phases: constant-current (CC) charging and constant-voltage (CV) charging. In CC mode, the TPS61383-Q1 charges the supercapacitor with a steady current of 3A until the voltage reaches approximately 7.5V. Subsequently, the device enters CV mode, where the charging current gradually tapers down. The entire charging sequence finishes in roughly 25s, satisfying the designated charging time constraint.