CAT4201 datasheet(5/12 Pages) ONSEMI

Part #	CAT4201

Description	High Efficiency Step Down LED Driver

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Manufacturer	ONSEMI [ON Semiconductor]

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CAT4201

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TYPICAL OPERATION CHARACTERISTICS

(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)

Figure 14. Efficiency vs. LED Current

Figure 15. LED Current Regulation vs.

Temperature

LED CURRENT (mA)

TEMPERATURE (

°C)

350

300

250

200

150

100

70

75

80

85

90

95

100

120

80

40

0

−40

−10

−8

−4

−2

2

4

8

10

Figure 16. LED Current vs. Input Voltage

(1 LED)

Figure 17. LED Current vs. Input Voltage

(2 LEDs)

INPUT VOLTAGE (V)

24

28

20

16

12

8

4

0

50

100

150

200

250

300

350

24

28

20

16

12

8

4

0

50

100

150

200

250

300

350

Figure 18. Switching Waveforms

Figure 19. CTRL Power−up

2

ms/div

40

ms/div

SW

5V/div

Inductor

Current

200mA/

div

CTRL

5V/div

LED

Current

200mA/

div

1 LED

2 LEDs

−6

0

6

VIN = 13 V

VF = 3.3 V

VF = 3.1 V

300 mA

150 mA

VF = 3.3 V

VF = 3.1 V

300 mA

150 mA

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