SLVUCA5 June   2022

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Before You Begin
  4. 2TPS7B4255EVM-062 Schematic
  5. 3Setup
    1. 3.1 LDO Input/Output Connector Descriptions
      1. 3.1.1 VIN and GND
      2. 3.1.2 VOUT and GND
      3. 3.1.3 EN
    2. 3.2 Optional Load Transient Input/Output Connector Descriptions
      1. 3.2.1 VDD and GND
      2. 3.2.2 J15
      3. 3.2.3 J18
      4. 3.2.4 J19
      5. 3.2.5 J21
      6. 3.2.6 J22
      7. 3.2.7 J23
      8. 3.2.8 J26
      9. 3.2.9 TP3
    3. 3.3 TPS7B4255-Q1 LDO Operation and Component Selection
    4. 3.4 Optional Load Transient Circuit Operation
  6. 4Board Layout
  7. 5Bill of Materials

3.1.3 EN

EN is a 3-pin header used to enable or disable the TPS7B84-Q1, which in turn enables the TPS7B4255-Q1.

The center pin of the 3-pin header is tied to the TPS7B84-Q1 EN input. When the 2-pin shunt is placed across the right two pins of the header, VIN is shorted to EN and the TPS7B84-Q1 is enabled. When the 2-pin shunt is placed across the left two pins of the header, GND is shorted to EN and the TPS7B84-Q1 is disabled.

If the TPS7B84-Q1 is not to be used to supply the ADJ/EN signal for the TPS7B4255-Q1, remove jumper J11 and use TP1 to drive ADJ/EN directly, or a combination of J5, R1, R3, C10 to configure ADJ/EN to be a function of the input voltage.