SLVUCK8 September   2022

 

  1.   TPS56C231LEVM 12-A, Regulator Evaluation Module
  2.   Trademarks
  3. 1Introduction
  4. 2Performance Specification Summary
  5. 3Modifications
    1. 3.1 Output Voltage Setpoint
    2. 3.2 Adjustable UVLO
  6. 4Test Setup and Results
    1. 4.1 Input and Output Connections
    2. 4.2 Start-Up Procedure
    3. 4.3 Start-Up
    4. 4.4 Shutdown
    5. 4.5 Output Voltage Ripple
  7. 5Board Layout
    1. 5.1 Layout
  8. 6Board Profile, Schematic, and List of Materials
    1. 6.1 Board Profile
    2. 6.2 Schematic
    3. 6.3 List of Materials
  9. 7References

Output Voltage Setpoint

To change the output voltage of the EVM, change the value of resistor R7 (RUPPER) and R9 (RLOWER). The value of R7 and R9 for a specific output voltage can be calculated using Equation 1 and refer to Table 3-1 for some recommendation values. See the TPS56C231 3.8-V to 17-V Input , 12-A Synchronous Step-Down Converter data sheet. See Table 3-1 to set the switching frequency.

Equation 1. GUID-9A910139-6F28-4A54-B6BF-F6D0381D71FF-low.gif
Table 3-1 Recommended Component Values
VOUT (V)RLOWER (kΩ)RUPPER (kΩ)

fSW (kHz)

LOUT (µH)COUT(min) (µF)

COUT(max) (µF)

CFF (PF)
0.6100

400

0.68300500

800

0.47

100

500

1200

0.33

88

500
1.21010

400

1.2

100

500

800

0.68

88

500

1200

0.47

88500
3.31045.3

400

2.488500100-220

800

1.5

88500100-220

1200

1.2

88500100-220
5.51082.5

400

3.3

88500100-220

800

2.4

88500100-220

1200

1.5

88700100-220