C1

PWM

H/C

RL

L1

L1 = 10

µH (part number: CDRH104R, manufacturer: Sumida)

C1 = 10

µF (part number: ECJ-4YB1C106K, manufacturer: Panasonic)

0

10

20

30

40

50

60

70

80

90

100

1

2

3

4

5

6

7

8

9

10

PO = 2 W

PO = 1 W

PO = 0.5 W

RL − Load Resistance − Ω

VDD = 5 V

fS = 500 kHz

1

2

3

4

5

6

7

8

9

10

PO = 1 W

PO = 0.5 W

PO = 0.25 W

RL − Load Resistance − Ω

0

10

20

30

40

50

60

70

80

90

100

VDD = 3.3 V

fS = 500 kHz

DRV593

DRV594

SLOS401C – OCTOBER 2002 – REVISED JULY 2010

www.ti.com

TEST SETUP FOR GRAPHS

The LC output filter used in Figure 2, Figure 3, Figure 8, and Figure 9 is shown below.

Figure 1. LC Output Filter

EFFICIENCY

EFFICIENCY

vs

vs

LOAD RESISTANCE

LOAD RESISTANCE

Figure 2.

Figure 3.

6

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