TIDUF84 June   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 UCC28810
      2. 2.3.2 MCF8315
      3. 2.3.3 MSPM0L
      4. 2.3.4 MSPM0C
  9. 3System Design Theory
    1. 3.1 MCF8315 Design
      1. 3.1.1 Power section
      2. 3.1.2 GPIO section
    2. 3.2 ACDC Design: Single Stage PFC
    3. 3.3 Host MCU Design
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Hardware Overview
      2. 4.1.2 TIDA-010951 PCB
    2. 4.2 Software Requirements
    3. 4.3 Testing requirements
    4. 4.4 Test Setup
    5. 4.5 Test Results
      1. 4.5.1 Power Management in TIDA-010951
      2. 4.5.2 UCC28810 Based Single Stage PFC
      3. 4.5.3 BLDC Residential Fan Operation Using MCF8315C
        1. 4.5.3.1 Power-Up Sequence
        2. 4.5.3.2 Forward Windmilling (ISD Forward Resync)
        3. 4.5.3.3 Reverse Windmilling (ISD Reverse Resync)
        4. 4.5.3.4 Direction Reversal
        5. 4.5.3.5 Fan Acceleration/Deceleration
      4. 4.5.4 Thermal Performance
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author
  13. 7Recognition

3.1.1 Power section

The power section of MCF8315/MCF8316 needs the following passive components for proper operation as shown in Figure 3-1.

  1. VM: Bulk capacitor (≥10µF, 2x VM) to reduce the input voltage ripple depending on the PWM switching frequency, peak phase currents etc., Additionally a 100nf, 2x VM capacitor can be added as an option to filter the high frequency noise on VM, if needed
  2. Charge pump: MCF8315/MCF8316 uses an integrated charge pump to generate the gate drive for high-side FETs. The charge pumps needs two caps – one rated at (47nF, 2x VM) between CPH and CPL pins and one rated (at 1µF, ≥16V) between CP and VM
  3. Buck: Buck converter can be operated in inductor mode (higher efficiency and cost) or resistor mode (lower efficiency and cost). In TIDA-010951, the buck converter is designed to operate in inductor mode and can deliver up to 170mA for external loads. The inductor is rated at 47µH, 1.5A saturation current and the capacitor is rated at 22µF, 10V. Refer to MCF8315 data sheet for more information on resistor mode.
  4. AVDD: This 3.3V LDO needs a decoupling cap rated at 1µF, 10V and can deliver up to 20mA for external loads. The minimum capacitance at AVDD is more than 600nF across operating conditions for rated 3.3V regulation.
  5. DVDD: This 1.5V LDO needs a decoupling cap rated at 1µF, 10V. The minimum capacitance at DVDD is more than 600nF across operating conditions for rated 1.5V regulation.
TIDA-010951 MCF8315/MCF8316 Power Section Figure 3-1 MCF8315/MCF8316 Power Section