TIDUFF8 September   2025

 

  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 LDC5072-Q1
      2. 2.3.2 MSPM0G3507
      3. 2.3.3 TPSM365R3
      4. 2.3.4 TLV9062
  9. 3System Design Theory
    1. 3.1 Hardware Design
      1. 3.1.1 Target PCB
      2. 3.1.2 Coil PCB
      3. 3.1.3 Signal Chain PCB
        1. 3.1.3.1 Inductive Angle Position Sensor Front-End Schematic
        2. 3.1.3.2 Differential to Single-Ended Signal Conversion
      4. 3.1.4 MSPM0G3507 Schematic Design
      5. 3.1.5 Power Supply Design
    2. 3.2 Absolute Position Calculation
    3. 3.3 Software Design
      1. 3.3.1 Angle Calculation Timing
      2. 3.3.2 Rotary Angle Error Sources and Compensation
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 PCB Overview
      2. 4.1.2 Encoder Interface
    2. 4.2 Software
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Inductive Sensor Sine and Cosine Noise Measurement
      2. 4.4.2 Absolute Angle Noise Measurement
      3. 4.4.3 Rotary Angle Accuracy Measurement
      4. 4.4.4 Impact of Air Gap on Noise, 4th Electrical Harmonics and Total Angle Accuracy
      5. 4.4.5 Power Consumption Measurement
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout
      4. 5.1.4 Altium Project Files
      5. 5.1.5 Gerber Files
      6. 5.1.6 Assembly Drawings
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5.     Trademarks
  12. 6About the Author

3.1.5 Power Supply Design

TIDA-010961 Input Power Supply Schematic Figure 3-6 Input Power Supply Schematic

The nominal input supply voltage is 24V with a maximum input voltage range of 60V. The TPSM365R3 DCDC buck module accepts up to 65V input and generates a 5.5V intermediate power rail. C1, C2, and C3 are decoupling capacitors and are placed close to VIN and the GND PIN. R5 configures the switching frequency of this converter, the 10kΩ resistor is set to 1500kHz. R3 and R4 set the output voltage to 5.5V. Equation 2 shows that the output voltage can be calculated with VFB = 1V.

Equation 2. Vout=VFBR4+R3R4
TIDA-010961 5V and 3.3V Point-of-Load Supply Schematic Figure 3-7 5V and 3.3V Point-of-Load Supply Schematic

The LDO TPS70950 generates 5V from the intermediate 5.5V input for LDC5072. The LDO TPS70933 generates a 3.3V rail for LDC5072, TLV9062, and MSPM0G3507. The J1 jumper selects the LDC5072 supply voltage, ether 3.3V or 5V. The 1μF capacitors C14 and C23 are added for noise decoupling and 10μF output capacitors C13 and C21 are added for stable operation.

The voltage reference REF3533 is powered by the 5V supply and generates precise 3.3V output as the reference of the MSPM0 ADC. Similarly, with the TPS7A0533, C8 (100nF) is needed for decoupling and C9 (1μF) are used for stable operation.