SLUUCK9 april   2023 TPSM843B22

 

  1.    TPSM843B22EVM 20-A, Regulator Evaluation Module
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  4. 2Configurations and Modifications
    1. 2.1 Output Voltage
    2. 2.2 Switching Frequency (FSEL Pin)
    3. 2.3 Current Limit, Soft-Start Time, and Internal Compensation (MSEL Pin)
    4. 2.4 Enable, UVLO (EN Pin)
  5. 3Test Setup and Results
    1. 3.1 Input and Output Connections
    2. 3.2 Efficiency
    3. 3.3 Output Voltage Regulation
    4. 3.4 Load Transient and Loop Response
    5. 3.5 Input Voltage Ripple
    6. 3.6 Start-up and Shutdown with EN
    7. 3.7 Start-up and Shutdown with VIN
    8. 3.8 Start-up Into Pre-Bias
    9. 3.9 Thermal Performance
  6. 4Board Layout
    1. 4.1 Layout
  7. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials

3.1 Input and Output Connections

The TPSM843B22EVM 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 20 A must be connected to J1 through a pair of 18-AWG wires or better.

The load must be connected to J8. Two pair of 18-AWG wires or better must be used for each connection. With the maximum current limit setting, the maximum load current capability is near 20 A before the TPSM843B22 goes into current limit. Wire lengths must be minimized to reduce losses in the wires.

Test point TP1 (VIN S+) provides a place to monitor the VIN input voltage with TP2 (VIN S-) providing a convenient ground reference for U1. TP10 (VOUT S+) is used to monitor the output voltage of U1 with TP11 (VOUT S-) as the ground reference.

If modifications are made to the TPSM843B22EVM, 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.

Table 3-1 Connectors and Jumpers
REFERENCE DESIGNATORNAMEFUNCTION
J1VINVIN screw terminal to connect input voltage (see Table 1-1 for VIN range)
J2

EN Select

3-pin header to connect to enable pin and allow for selection between ON and OFF. Populate R1 and R2 for desired EN voltage.

J3FSEL/SYNCSelect between internal frequency set through resistor or external clock
J4FSEL SelectFSEL selection header. Use shunt to select FSEL resistor. See Table 2-2.
J5MSEL SelectMSEL selection header. Use shunt to set current limit, soft-start time, ramp time. See Table 2-3.
J6VOUT SelectVOUT selection header. Use shunt to set output voltage. See Table 2-1.
J7VOUTVOUT test point, coaxial cable
J8VOUTVOUT screw terminal to connect load to output
Table 3-2 Test Points
REFERENCE DESIGNATORNAMEFUNCTION
TP1VIN S+VIN test point. Use this for efficiency and VIN measurement.
TP2VIN S-PGND test point. Use this for efficiency and VIN measurement.
TP3ENEN test point. If applying an external voltage, keep the voltage below the absolute maximum voltage of the EN pin of 6 V.
TP4SYNCExternal clock test point
TP5MSELMSEL test point
TP6BODE+Test point for Bode plot measurements.
TP7BODE-Test point for Bode plot measurements.
TP8PGOODPG test point
TP9SWSW test point
TP10

VOUT S+

VOUT test point. Use this for efficiency, output regulation and VOUT measurement.
TP11

VOUT S-

PGND test point. Use this for efficiency, output regulation and VOUT measurement.
TP12PGNDPGND test point
TP13PGNDPGND test point
TP14PGNDPGND test point