SNVU745A January   2021  – May 2021 TPS62901 , TPS62902 , TPS62903

 

  1.   Trademarks
  2. 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 SS/TR Capacitor
      4. 1.2.4 Feedforward Capacitor
      5. 1.2.5 MODE/S-CONF Resistor
      6. 1.2.6 Loop Response Measurement
  3. 2Setup
    1. 2.1 Input/Output Connector Descriptions
  4. 3Safety Instructions
  5. 4 Test Results
  6. 5 Board Layout
  7. 6Schematic and Bill of Materials
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
  8. 7Revision History

2.1 Input/Output Connector Descriptions

    J1, Pin 1 and 2 – VIN Positive input connection from the input supply for the EVM.
    J1, Pin 3 and 4 – S+/S- Input voltage sense connections. Measure the input voltage at this point.
    J1, Pin 5 and 6 – GND Return connection from the input supply for the EVM.
    J2, Pin 1 and 2 – VOUT Output voltage connection
    J2, Pin 3 and 4 – S+/S- Output voltage sense connections. Measure the output voltage at this point.
    J2, Pin 5 and 6 – GND Output return connection
    J3 – PG/GND The PG output is on pin 1 of this header with a convenient ground on pin 2.
    J4 – TRACK-IN/SS/TR/GND By removing C3, the IC tracks an externally applied voltage. Apply the voltage on pin 1 to scale the applied voltage through R7 and R8. The SS/TR voltage can be measured on pin 2.
    J5 – SW/GND This header is not installed. Use the holes in the PCB to measure the SW node on pin 2 with a convenient GND on pin 1.
    JP1 – EN EN 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 R5 and R6.
    JP2 – MODE/S-CONF MODE/S-CONF pin input jumper. Place the supplied jumper across PWM and MODE/S-CONF to operate the IC in forced PWM mode. Place the jumper across PFM/PWM and MODE/S-CONF to operate the IC in Auto PFM/PWM mode. Remove the jumper to operate the IC with the MODE/S-CONF settings set by R4.
    Note: If it is desired to change between PWM and PFM/PWM modes during operation, JP2 must be set to either PWM or PFM/PWM before enabling the IC.
    JP3 – PG Pull-up Voltage PG pin pull-up voltage jumper. Place the supplied jumper on JP3 to connect the PG pin pull-up resistor to VOUT. Alternatively, the jumper can be removed and a different voltage can be supplied on pin 1 to pull up the PG pin to a different level. This externally applied voltage must remain below 18 V.