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Application Circuits

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4.7

F

m

4.7

F

m

0.01

F

m

0.01

F

m

15

F

m

330

F

m

0.01

F

m

10kW

3.16kW

Design Procedure

TPS5450

SLVS757 – MARCH 2007

APPLICATION INFORMATION (continued)

Figure 11 shows the schematic for a typical TPS5450 application. The TPS5450 can provide up to 5-A output

current at a nominal output voltage of 5 V. For proper thermal performance, the exposed PowerPAD™

underneath the device must be soldered down to the printed-circuit board.

Figure 11. Application Circuit, 12-V to 5.0-V

The following design procedure can be used to select component values for the TPS5450. Alternately, the

SWIFT™ Designer Software may be used to generate a complete design. The SWIFT™ Designer 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:

• Input voltage range

• Output voltage

• Input ripple voltage

• Output ripple voltage

• Output current rating

• Operating frequency

Design Parameters

For this design example, use the following as the input parameters:

EXAMPLE VALUE

Input voltage range

10 V to 31 V

Output voltage

5 V

Input ripple voltage

400 mV

Output ripple voltage

30 mV

Output current rating

5 A

Operating frequency

500 kHz

(1)

As an additional constraint, the design is set up to be small size and low component height.

11

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