SLUUCR2 October   2023 TPSM843620

 

  1.   1
  2.    TPSM843620EVM 6-A, SWIFT™ Regulator Evaluation Module
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  5. 2Configurations and Modifications
    1. 2.1 Output Voltage
    2. 2.2 Switching Frequency (SYNC/FSEL Pin)
    3. 2.3 Current Limit, Soft-Start Time, and Internal Compensation (MODE Pin)
    4. 2.4 Adjustable UVLO
  6. 3Test Setup and Results
    1. 3.1  Input/Output Connections
    2. 3.2  BOM Modifications for Spins
    3. 3.3  Efficiency
    4. 3.4  Output Voltage Regulation
    5. 3.5  Load Transient and Loop Response
    6. 3.6  Output Voltage Ripple
    7. 3.7  Input Voltage Ripple
    8. 3.8  Start-up and Shutdown with EN
    9. 3.9  Start-up and Shutdown with VIN
    10. 3.10 Start-up Into Pre-Bias
    11. 3.11 Thermal Performance
  7. 4Board Layout
    1. 4.1 Layout
  8. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials

3.1 Input/Output Connections

The TPSM843620EVM is provided with input connectors, output connectors, and test points as shown in Table 3-1 and Table 3-2.

To support the minimum input voltage with the full rated load on both outputs with the default EVM, a power supply capable of supplying greater than 5 A must be connected to J2 through a pair of 20-AWG wires or better.

For U1 the load must be connected to J1. A pair of 20-AWG wires or better must be used for each connection. With the maximum current limit setting, the maximum load current capability is near 8 A before the TPSM843620 goes into current limit. Wire lengths must be minimized to reduce losses in the wires.

TP3 provides a place to monitor the VIN input voltage with TP4 providing a convenient ground reference. TP9 is used to monitor the output voltage of U1 with TP10 as the ground reference.

If modifications are made to the TPSM843620EVM, then the input current can change. The input power supply and wires connecting the EVM to the power supply must be rated for the input current.

Note:

For the FSEL pin of the TPSM843x20 to correctly detect the resistor value connected to ground, the buffers on the EVM need to be provided a VCC voltage of 2 V to 5.5 V to go high impedance. Populating the shunt on J3 enables the output of the buffer.

Table 3-1 Connectors and Jumpers
REFERENCE DESIGNATOR NAME FUNCTION
J1 VOUT VOUT screw terminal to connect load to output.
J2 VIN VIN screw terminal to connect power to input.
J3 EXT SYNC 2-pin header to connect U2 buffer output enable to ground. Populate shunt to enable output of buffer. Remove shunt to make buffer output high impedance.
J4 MODE MODE selection header. Use shunt to select MODE resistor. See Table 2-3.
J5 SYNC/FSEL FSEL selection header. Use shunt to select FSEL resistor. See Table 2-2.
Table 3-2 Test Points
REFERENCE DESIGNATOR NAME FUNCTION
TP1 VIN VIN test point. Use this for input ripple measurements.
TP2 PGND PGND test point. Use this for input ripple measurements.
TP3 VIN_EFF VIN test point near input terminals. Use this for efficiency measurements.
TP4 PGND_EFF PGND test point near input terminals. Use this for efficiency measurements.
TP5 PGOOD PGOOD test point.
TP6 AGND AGND test point.
TP7 VOUT VOUT test point. Use this for output ripple measurements.
TP8 PGND PGND test point. Use this for output ripple measurements.
TP9

VOUT_EFF

 VOUT test point near output terminals. Use this for efficiency measurements.
TP10 PGND_EFF PGND test point near output terminals. Use this for efficiency measurements.
TP11 EN EN test point. If applying an external voltage, then EN must be kept below the absolute maximum voltage of the EN pin of 6 V.
TP12 VOUT meSMB connector to measure output voltage. When using this test point, make sure the scope is set for 1-MΩ termination. When using 50-Ω termination, a 2:1 divider is created.
TP13 EXT_SYNC SYNC test point. Supply an external clock to this test point if using one.
TP14 SYNC/FSEL FSEL test point.
TP15 MODE MODE test point.
TP16 BODE Test point between voltage divider network and output voltage. Used for Bode plot measurements.