Copyright

© ANPEC Electronics Corp.

Rev. A.6 - Aug., 2011

APW7208

www.anpec.com.tw

4

Typical Operating Characteristics

Efficiency vs. WLED Current

Efficiency vs. WLED Current

WLED Current vs. PWM Duty Cycle

Switching Frequency vs. Supply

Voltage

Switch ON Resistance vs. Supply

Voltage

WLED Current vs. Supply Voltage

(Refer to figure 1 in the section “Typical Application Circuits”, V

Supply Voltage, V

2.5

3

3.5

4

4.5

5

5.5

6

0.4

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

Supply Voltage, V

19.0

19.2

19.4

19.6

19.8

20.0

20.2

20.4

20.6

20.8

21.0

2.5

3

3.5

4

4.5

5

5.5

6

Supply Voltage, V

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

2.5

3

3.5

4

4.5

5

5.5

6

WLED Current, I

0

5

10

15

20

25

30

50

55

60

65

70

75

80

85

90

95

V

V

V

V

6 WLEDs

19.3V@20mA

≅

4 WLEDs

13V@20mA

V

V

V

V

0

5

10

15

20

25

30

50

55

60

65

70

75

80

85

90

95

≅

WLED Current, I

PWM Duty Cycle (%)

0

20

40

60

80

100

0

2

4

6

8

10

12

14

16

18

20

100Hz

100kHz

1kHz