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DESIGN EXAMPLES

Example 1: Detailed Design of a 12-V to 5-V and 3.3-V Converter

DESIGN EXAMPLE 1 GENERAL DESCRIPTION

TPS55383

,, TPS55386

SLUS818 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com

The following example illustrates a design process and component selection for a 12-V to 5-V and 3.3-V dual

non-synchronous buck regulator using the TPS55386 converter. Design Example, and List of Materials is found

at the end of this section.

PARAMETER

NOTES AND CONDITIONS

MIN

NOM

MAX

UNIT

INPUT CHARACTERISTICS

VIN

Input Voltage

9.6

12.0

13.2

IIN

Input Current

VIN = Nom, IOUT1 = IOUT2 = Max

2.4

2.6

No Load Input Current

VIN = Nom, IOUT = 0 A

VIN_UVLO

Input UVLO

IOUT = Min to Max

4.0

4.2

4.4

OUTPUT CHARACTERISTICS

VOUT1

Output Voltage 1

VIN = Nom, IOUT = Nom

4.80

5.0

5.20

VOUT2

Output Voltage 2

VIN = Nom, IOUT = Nom

3.20

3.3

3.40

Line Regulation

VIN = Min to Max

Load Regulation

IOUT = Min to Max

VOUT_ripple

Output Voltage Ripple

VIN = Nom, IOUT = Max

mVpp

IOUT1

Output Current 1

VIN = Min to Max

3.0

IOUT2

Output Current 2

VIN = Min to Max

3.0

IOCP1

Output Over Current Channel 1

VIN = Nom, VOUT = VOUT1–5%

3.3

4.2

5.2

IOCP2

Output Over Current Channel 2

VIN = Nom, VOUT = VOUT2–5%

3.3

4.2

5.2

Transient Response

ΔVout from load transient

ΔIOUT = 1 A at 3 A/µs

200

Settling Time

To 1% of Vout

SYSTEM CHARACTERISTICS

fSW

Switching Frequency

500

600

700

kHz

Peak Efficiency

VIN = Nom, IOUT1 = IOUT2

93%

Full Load Efficiency

VIN = Nom, IOUT1 = IOUT2 = Max

86%

Top

Operating Temperature Range

VIN = Min to Max, IOUT = Min to Max

°C

Figure 33. Design Example Schematic

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Product Folder Link(s): TPS55383 TPS55386

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