TIDUEJ8C January   2019  – May 2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 MSPM0G1506
      2. 2.3.2 LMG2100R044
      3. 2.3.3 INA241
      4. 2.3.4 TPSM365
      5. 2.3.5 TMP303
    4. 2.4 System Design Theory
      1. 2.4.1 MPPT Operation
      2. 2.4.2 Buck Converter
        1. 2.4.2.1 Output Inductance
        2. 2.4.2.2 Input Capacitance
      3. 2.4.3 Current Sense Amplifier
        1. 2.4.3.1 Shunt Resistor Selection
        2. 2.4.3.2 Current Measurement Resolution
        3. 2.4.3.3 Shunt Resistor Power Dissipation
      4. 2.4.4 Switching Regulator
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
        1. 3.1.1.1 TIDA-010042
        2. 3.1.1.2 ITECH-IT6724H
        3. 3.1.1.3 Chroma, 63107A
      2. 3.1.2 Software Flow
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Test Results
  10. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Loop Inductances
      2. 4.3.2 Current Sense Amplifiers
      3. 4.3.3 Trace Widths
      4. 4.3.4 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
    7. 4.7 Software Files
  11. 5Related Documentation
    1. 5.1 Trademarks
    2. 5.2 Support Resources
  12. 6About the Author
  13. 7Revision History

3.2.2 Test Results

As Figure 3-5 and Figure 3-6 shows, in 12V battery system, peak efficiency is about 98.5% at 60W output power, European weighted efficiency is about 97.87%, in 24V battery system, peak efficiency is about 98.8% at 160W output power, European weighted efficiency is about 98.5%.

TIDA-010042 Efficiency Curve Over Output Power for the 12V SystemFigure 3-5 Efficiency Curve Over Output Power for the 12V System
TIDA-010042 Efficiency Curve Over Output Power for the 24V SystemFigure 3-6 Efficiency Curve Over Output Power for the 24V System
TIDA-010042 Switch Nodes at 40V Input; 24V, 16A Output, rising edgeFigure 3-7 Switch Nodes at 40V Input; 24V, 16A Output, rising edge
TIDA-010042 Switch Nodes at 40V Input; 24V, 16A Output, falling edgeFigure 3-8 Switch Nodes at 40V Input; 24V, 16A Output, falling edge

Figure 3-7 show a 6ns rise time, with almost zero overshoot, Figure 3-8 shows a 4ns fall time. Both figures show a very good switching behavior of LMG2100.

Figure 3-9 shows the battery current, battery voltage, panel current, and panel voltage at 400W output power. Input voltage is about 41V, output voltage is 24V.

TIDA-010042 Battery Current, Battery Voltage, Panel Current and Panel VoltageFigure 3-9 Battery Current, Battery Voltage, Panel Current and Panel Voltage

Figure 3-10 shows the system periodically goes into wait state when the battery current is lower than the limitation value (tested with the electronic load turned off). Input current is almost zero which means the output current is also almost zero, after some cycles of judgement, the system goes into wait state, no PWM is sent by the MCU and output voltage drops.

TIDA-010042 System Current and Voltage When in Wait ModeFigure 3-10 System Current and Voltage When in Wait Mode