SLVUCC3 January   2022 TPS629203

 

  1.   Trademarks
  2. 1Introduction
  3. 2Performance Specification
  4. 3EVM Configuration and Modification
    1. 3.1 Input and Output Capacitors
    2. 3.2 Configurable Enable Threshold Voltage
    3. 3.3 MODE/S-CONF Setting
    4. 3.4 Power Good
    5. 3.5 Power Good Pullup Voltage
    6. 3.6 Feedforward Capacitor Option
    7. 3.7 Output Voltage Setting
    8. 3.8 Loop Response Measurement
  5. 4EVM Test Setup
    1. 4.1 Input and Output Connectors
    2. 4.2 Jumper Configuration
      1. 4.2.1 JP1 Enable
      2. 4.2.2 JP2 MODE/S-CONF
      3. 4.2.3 JP3 Power Good
      4. 4.2.4 JP4 PG Pullup Voltage
  6. 5Test Results
  7. 6Board Layout
  8. 7Schematic and Bill of Materials
    1. 7.1 Schematic
    2. 7.2 Bill of Materials
  9. 8References

3.3 MODE/S-CONF Setting

JP2 is used to set different MODE/S-CONF configurations. MODE/S-CONF can be connected to VIN and GND as a traditional HIGH or LOW level. R6 and R7 select the other device configurations including the following:

  • Internal/external feedback
  • Switching frequency
  • Output discharge
  • Auto PFM/PWM or forced PWM options
The values of R6 and R7 can be changed per the user’s requirement.

  • While using the internal feedback (VSET) configuration for the output voltage setting, either float the FB pin by cutting the net tie (NT1) included on the back of the board or remove both R1 and R2 for 3.3-V output voltage. Other output voltage can be programmed by removing R1 and changing the value of R2. Ensure the JP2 jumper is placed correctly for proper operation with internal feedback.
    WARNING: Do not set the MODE/S-CONF pin for external feedback if either the net tie (NT1) is cut or R1 and R2 are removed. This can cause damage to the device due to lack of external feedback control.
  • Dynamic mode option is an advanced feature that allows the MODE/S-CONF pin to actively switch between forced PWM and auto PFM/PWM during operation, but this is only possible by driving the MODE/S-CONF pin between VIN and GND. This feature provides the user with the option of controlling if and when the device enters power save mode (DCM).