SLVUCA3 August   2022 TPS56C231

 

  1.   TPS56C231EVM 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

3.1 Output Voltage Setpoint

To change the output voltage of the EVM, it is necessary to 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 TPS56C231x 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-70F7FC62-93F2-4585-835E-7323E5F5533C-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)
0.6 10 0

400

 0.68 300 500 —

800

0.47

100

 500 —

1200

0.33

88

 500 —
1.2 10 10

400

1.2

100

 500 —

800

0.68

88

 500 —

1200

0.47

 88 500 —
3.3 10 45.3

400

 2.4 88 500 100-220

800

1.5

 88 500 100-220

1200

1.2

 88 500 100-220
5.0 10 82.5

400

3.3

 88 500 100-220

800

2.4

 88 500 100-220

1200

1.5

 88 700 100-220