SLVUCG4 October   2022 TPSM82912 , TPSM82913

 

  1.   TPSM8291xEVM Evaluation Module
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Performance Specification
    2. 1.2 Modifications
      1. 1.2.1 Input and Output Capacitors
      2. 1.2.2 Configurable Enable Threshold Voltage
      3. 1.2.3 NR/SS Capacitor
      4. 1.2.4 Feedforward Capacitor
      5. 1.2.5 S-CONF Resistor
      6. 1.2.6 Single LC Filter Operation
  4. 2Setup
    1. 2.1 Input and Output Connector Descriptions
    2. 2.2 Ripple Measurement Setup
  5. 3 Test Results
  6. 4 Board Layout
  7. 5Schematic and Bill of Materials
    1. 5.1 Schematic
  8. 6Bill of Materials

2.1 Input and Output Connector Descriptions

    J3, Pin 5 and 6 – VIN

    Positive input connection from the input supply for the EVM.

    J3, Pin 3 and 4 – S+/S-

    Input voltage sense connections. Measure the input voltage at this point.

    J3, Pin 1 and 2 – GND

    Return connection from the input supply for the EVM.

    J4, Pin 1 and 2 – VOUT_FILT

    Filtered output voltage connection

    J4, Pin 3 and 4 – S+/S-

    Output voltage sense connections. Measure the output voltage at this point.

    J4, Pin 5 and 6 – GND

    Output return connection

    J8 – PG/GND

    The PG output is on pin 1 of this header with a convenient ground on pin 2.

    J1 – VOUT Ripple Measurement

    Use this SMA connector to measure the output voltage ripple before the second LC filter.

    J2 – VOUT_FILT Ripple Measurement

    Use this SMA connector to measure the output voltage ripple after the second LC filter.

    J5 – EN/SYNCEN/SYNC pin input jumper. Place the supplied jumper across ON and EN to turn on the IC. Place the jumper across OFF and EN to turn off the IC. Remove the jumper to set a configurable enable threshold voltage with R3 and R5.

    With the jumper removed, a clock signal can be applied on J5 to synchronize the IC's switching. To allow the IC to accept the applied SYNC signal, the jumper on J6 needs to be removed before applying the input voltage.

    J6 – S-CONF

    S-CONF pin input jumper. Place the supplied jumper across 2.2 MHz and S-CONF to operate the IC with a 2.2-MHz switching frequency without spread spectrum or output discharge. Place the jumper across 1 MHz and S-CONF to operate the IC with a 1-MHz switching frequency without spread spectrum or output discharge. Remove the jumper to operate the IC with the S-CONF settings set by R7 and to allow clock synchronization.

    Note: Set the J6 jumper position before enabling the IC. Changing J6 after enabling the IC has no effect.
    Note: When using the 2.2-MHz setting, ensure that the input voltage and output voltage do not violate the minimum on-time in the TPSM8291x 3-V to 17-V, 2-A/3-A Low Noise and Low Ripple Buck Power Module with Integrated Ferrite Bead Filter Compensation data sheet.

    J7 – PG Pullup VoltagePG pin pullup voltage jumper. Place the supplied jumper on J7 to connect the PG pin pullup resistor to VOUT_FILT. Alternatively, the jumper can be removed and a different voltage can be supplied on pin 2 to pull up the PG pin to a different level. This externally applied voltage must remain below 18 V.