SLVUD37 December   2024 TPS62968

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
    5. 1.5 Cautions and Warnings
  7. 2Hardware
    1. 2.1 Setup
      1. 2.1.1 Input and Output Connector Descriptions
  8. 3Implementation Results
    1. 3.1 Test Results
    2. 3.2 Ripple Measurement Setup
    3. 3.3 Modifications
      1. 3.3.1 Input and Output Capacitors
      2. 3.3.2 Configurable Enable Threshold Voltage
      3. 3.3.3 NR/SS Capacitor
      4. 3.3.4 Feedforward Capacitor
      5. 3.3.5 S-CONF Resistor
      6. 3.3.6 Loop Response Measurement
      7. 3.3.7 Single LC Filter Operation
    4. 3.4 Performance Specification
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1. 5.1 Trademarks

2.1.1 Input and Output Connector Descriptions

    JB1 – VIN

    Positive input connection from the input supply for the EVM. Connect the input power supply between VIN and GND.

    TP1/TP2– S+/ S–

    Input voltage sense connection. Measure the input voltage at these test points.

    JB2 – VOUT_FILT

    Filtered output voltage connection. Connect any resistive or electronic load here.

    TP4/TP5– S+/ S–

    Filtered output voltage sense connections. Measure the output voltage at these test points.

    TP6/TP7– S+/ S–Output voltage sense connections. Measure the output voltage at these test points.
    J3 – 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.

    JP1 – 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 R6 and R7.

    With the jumper removed, a clock signal can be applied on JP1 to synchronize the IC switching.

    JP2 – S-CONF

    S-CONF pin input jumper. Place the supplied jumper across 2.2MHz and S-CONF to operate the IC with a 2.2MHz switching frequency without spread spectrum or output discharge. Place the jumper across 1MHz and S-CONF to operate the IC with a 1MHz switching frequency without spread spectrum or output discharge. Remove the jumper to operate the IC with the S-CONF settings set by R4 and to allow clock synchronization.

    Note: Set the JP2 jumper position before enabling the IC. Changing JP2 after enabling the IC has no effect.
    Note: When using the 2.2MHz setting, make sure that the input voltage and output voltage do not violate the minimum on-time in the TPS6296x 3V to 17V, 4.5A/6A/8A, Low Noise and Low Ripple Buck Converter With Integrated Ferrite Bead Filter data sheet.
    JP3 – PG Pullup VoltagePG pin pullup voltage jumper. Place the supplied jumper on JP3 to connect the PG pin pullup resistor to VOUT. 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 18V.