TIDUF59 March   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
      1. 2.2.1 PFC Inductance Design
      2. 2.2.2 Configuration of CS pin in LMG3622
      3. 2.2.3 AHB Topology and the VCC Design
      4. 2.2.4 LMG2610 for AHB Topology
    3. 2.3 Highlighted Products
      1. 2.3.1 UCC28056
      2. 2.3.2 LMG3622
      3. 2.3.3 LMG2610
  9. 3Hardware, Test Requirements, and Test Results
    1. 3.1 Hardware
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Switching Waveform
        1. 3.3.1.1 Switching Waveform on the PFC Stage
        2. 3.3.1.2 Switching Waveform on the AHB Stage
      2. 3.3.2 Efficiency Test Result
      3. 3.3.3 Thermal Test Result
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Layout Prints {Optional Section}
    2. 4.2 Tools
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.2 Test Setup

The following test equipment is required when working with this reference design:

    Voltage Source Isolated AC source or variable AC transformer capable of 264VRMS and capable of handling 200W power level.
    CAUTION: Do not apply DC voltage to this board when testing. Damage to equipment and components is possible.
    Power Analyzer Capable of measuring 1mW to 200W of input power and capable of handling 264VRMS input voltage. Some power analyzers can require a precision shunt resistor for measuring input current to measure input power of 5W or less. Read the user manual for the power analyzer for proper measurement setups for full power and for stand-by power.
    Oscilloscope > 4-channel, 500MHz bandwidth. Probes capable of handling 600V.
    Current probe > 15A DC or AC current probe for oscilloscope.
    Load To obtain the full load current 3.00A from 5V, 9V, and 5A from 15V, 20V and 28V. The output voltage can be obtained from C121 to eliminate the cable drop.

This remainder of this section describes the test setup of the reference design board.

WARNING: This reference design is not encapsulated and there are accessible voltages that are greater than 50V<sub>DC</sub>. Use appropriate handling precautions to avoid injury.

The AC input power goes through the power analyzer to support the reference design board. Connect the output ports to the electric load to monitor the output condition. TIDA-050074 was design for 5V–28V which is set with the jumper from J201 to J204.

GUID-20231208-SS0I-XVFJ-QBGM-MRLB8PZK0NC0-low.svg Figure 3-3 Test Setup Diagram

This reference design is a compact design without test points. Connect the AC inlet on the L and N of the board close to F1 and C1. Place the voltage sense of the power analyzer close to L and N which is shown in Figure 3-3. Adjust the input voltage and read the power analyzer for the right input voltage to eliminate the effect of the AC cable drop. Read the input power with the average or integration function from the power analyzer.

Figure 3-4 illustrates the AC input and voltage sense from the power meter connected close to the reference design board.

GUID-20231225-SS0I-T2L4-10SX-LRZR5MSC0P0W-low.jpg Figure 3-4 AC Input Connection Setting

Connect the output wires on the output (VOUT and RTN). Solder 2 wires on the output (VOUT and RTN) which is connected to the electronic load. Solder another 2 wires on the lead of C121 which is connected to the remote sense of the electronic load to eliminate the loss of the cable drop.

Figure 3-5 shows VOUT and RTN connected to E-load and remote sense connects from the lead of C121.

GUID-20231225-SS0I-PRW9-J3CN-N915KW2PKP4K-low.jpg Figure 3-5 Output Connection

Table 3-1 details the output jumper settings for the output voltage through the jumper. Turn off the AC power source and make sure the voltage on the board is fully discharged before changing the output voltage setting.

Table 3-1 Output Jumper Settings
VOUT J201 J202 J203 J204
5V NC NC NC NC
9V Jumper NC NC NC
15V Jumper Jumper NC NC
20V Jumper Jumper Jumper NC
28V Jumper Jumper Jumper Jumper
GUID-20231226-SS0I-FTVM-8SHC-2QKKL7TLJJH0-low.jpg Figure 3-6 Jumper for the VOUT Setting