TPS54231
SLUS851–OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
APPLICATION INFORMATION
L1
10 mH
C4
0.1 mF
C8
47 mF
C9
47 mF
R5
10.2 kW
R6
3.24 kW
C2 C3
4.7 mF 0.01 mF
C1
4.7 mF
R1
332 kW
C6
1000 pF
C7
47 pF
C5
0.015 mF
R2
68.1 kW
R3
29.4 kW
Figure 13. Typical Application Schematic
STEP BY STEP DESIGN PROCEDURE
The following design procedure can be used to select component values for the TPS54231. Alternately, the
SwitcherPro™Software may be used to generate a complete design. The SwitcherPro™ Software uses an
iterative design procedure and accesses a comprehensive database of components when generating a design.
This section presents a simplified discussion of the design process.
To begin the design process a few parameters must be decided upon. The designer needs to know the following:
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Input voltage range
Output voltage
Input ripple voltage
Output ripple voltage
Output current rating
Operating frequency
For this design example, use the following as the input parameters
Table 3. Design Parameters
DESIGN PARAMETER
Input voltage range
Output voltage
EXAMPLE VALUE
7 V to 28V
3.3 V
Input ripple voltage
Output ripple voltage
Output current rating
Operating Frequency
300 mV
30 mV
2 A
570 kHz
SWITCHING FREQUENCY
The switching frequency for the TPS54231 is fixed at 570 kHz.
10
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