SLVUC68 September   2021 TPSM5601R5H

 

  1.   Trademarks
  2. 1EVM Setup
  3. 2EVM Connectors and Test Points
  4. 3EVM Parameters
    1. 3.1 Maximum Output Current
    2. 3.2 Maximum VIN and VOUT Configurations
    3. 3.3 Switching Node Behavior
  5. 4Typical Performance
    1. 4.1 Typical Characteristics (VIN = 12 V)
    2. 4.2 Typical Characteristics (VIN = 24 V)
    3. 4.3 Typical Characteristics (VIN = 36 V)
    4. 4.4 Typical Characteristics (VIN = 48 V)
  6. 5Feature Description
    1. 5.1 Enable Pin (EN)
    2. 5.2 Power-Good Pin (PGOOD)
    3. 5.3 System Loop Stability
  7. 6Layout
    1. 6.1 PCB Layout
  8. 7Schematic
  9. 8Bill of Materials (BOM)
  10.   Device Support
    1.     Related Documentation
    2. 9.1 Support Resources

5.1 Enable Pin (EN)

In an IBB configuration, the enable voltage thresholds are referenced to –VOUT instead of GND as in a typical non-inverting buck. This behavior can cause difficulties enabling or disabling the device. Therefore, the TPSM5601R5H-IBB-EVM includes a level-shifting circuitry (Figure 5-1) to alleviate any problems associated with the offset EN threshold voltages. This eliminates the need for negative EN signals. If the enable/disable feature is not needed, then remove resistor R9 located on the bottom side of the EVM and place the jumper on VIN_EN jumper (J7). For a deeper understanding of the EN level-shifting circuitry, see the Inverting Application for the TPSM5601R5H Application Report.

Figure 5-1 Enable Level-Shifter

The following are connection steps required to use enable/disable level-shifting circuitry:

  1. Place a jumper on the control header (J6) for desired function ON or OFF.
  2. Apply a minimum DC votlage of 5 V on the SYS_EN testpoint. Do not exceed 20 V on this test point.
Figure 5-2 and Figure 5-3 demonstrate a typical start-up and shutdown behavior when using the enable level-shifting circuitry.

Figure 5-2 Enable Turn-On on VIN = 24 V
Figure 5-3 Enable Turn-Off on VIN = 24 V