Output Current (A)

0

0.5

1

1.5

2

2.5

3

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

D003

Output Current (A)

0

0.5

1

1.5

2

2.5

3

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

D004

Output Current (A)

0

0.5

1

1.5

2

2.5

3

0

10

20

30

40

50

60

70

80

90

100

D001

Output Current (A)

0.001

0.01 0.02

0.05 0.1 0.2

0.5

1

2 3 4 5

5

0

10

20

30

40

50

60

70

80

90

100

D002

l

2

2

LO(RMS)

O

P P

1

I

I

I

12

-

=

+

l

l

P P

PEAK

O

I

I

I

2

-

=

+

IN(MAX)

OUT

OUT

P P

IN(MAX)

O

SW

V

V

V

I

V

L

ƒ

-

-

=

´

´

l

TPS562210, TPS563210

SLVSCM6A – FEBRUARY 2015 – REVISED AUGUST 2015

www.ti.com

(9)

(10)

(11)

For this design example, the calculated peak current is 3.505 A and the calculated RMS current is 3.014 A. The

inductor used is a TDK CLF7045T-1R5N with a peak current rating of 7.3-A and an RMS current rating of 4.9-A.

The capacitor value and ESR determines the amount of output voltage ripple. The TPS563209 is intended for

use with ceramic or other low ESR capacitors. Recommended values range from 20

μF to 68 μF. Use Equation 7

to determine the required RMS current rating for the output capacitor. For this design three TDK

C3216X5R0J226M 22

μF output capacitors are used. The typical ESR is 2 mΩ each. The calculated RMS

current is 0.292A and each output capacitor is rated for 4 A.

9.2.2.3 Application Curves

The following application curves were generated using the application circuit of Figure 33.

Figure 34. TPS563210 Efficiency

Figure 35. TPS563210 Light Load Efficiency

20

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