SC440A

18

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© 2010 Semtech Corp.

ITEM

QUANTITY

REFERENCE

PART

1

1

CR4

1nF

2

1

C2

10μF, 50V, 1210

3

2

C6, C7

2.2μ, 25V, 0805

4

1

C8

47nF

5

1

C9

12nF

6

1

D1

SS14

7

1

L1

6.8μ, IHLP-2525CZ1

8

1

R4

10k

9

1

R2

221k

10

2

R3, R9

20k

11

2

R7

10k

12

1

R8

2k

13

1

U1

SC440A, Semtech

14

1

R5

1, 0805

15

48

LEDs

SML-LX0603UWD

16

1

R6

1.5k

BOM for 6 string 8-LED Application Case

Case 3: Schematic for 6 strings 12 low Vf LEDs per string application

C8

R7

10k

C1

4.7uF

C6

2.2u

R2

249k

LED

LED

LED

LED

R4

10k

LED

LED

R5 1

LED

LED

LED

LED

GND

C7

2.2u

R6

6.04k

C9

12n

GND

D1

L1

10u

VIN=12V

R8 3k

LED

LED

IO1

1

AGND

2

FFLAG

3

EN

4

SS

5

OVPRTN

6

7

8

9

10

12

VIN

13

IOSET

14

SCP_EN

15

COMP

16

VOUT

17

PWM

18

19

20

21

22

23

24

25

SC440A

47n

R3

20k

R9

20k

CR4

1n

12 low Vf LEDs per string

PWM

Toko, DS86C

SS15

C2

4.7uF

C3

4.7uF

50V

50V

50V

C8

R7

10k

C1

4.7uF

C6

2.2u

R2

249k

LED

LED

LED

LED

R4

10k

LED

LED

R5 1

LED

LED

LED

LED

GND

C7

2.2u

R6

6.04k

C9

12n

GND

D1

L1

10u

VIN=12V

R8 3k

LED

LED

IO1

1

AGND

2

FFLAG

3

EN

4

SS

5

OVPRTN

6

7

8

9

10

12

VIN

13

IOSET

14

SCP_EN

15

COMP

16

VOUT

17

PWM

18

19

20

21

22

23

24

25

SC440A

47n

R3

20k

R9

20k

CR4

1n

12 low Vf LEDs per string

PWM

Toko, DS86C

SS15

C2

4.7uF

C3

4.7uF

50V

50V

50V