74408943470 datasheet(6/14 Pages) UNIONSEMI

Part #	74408943470

Description	Hysteretic Buck High Brightness LED Driver with Internal Switch

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Manufacturer	UNIONSEMI [Union Semiconductor, Inc.]

Direct Link	http://www.union-ic.com

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6 / 14 page

________________________________________________________________________

http://www.union-ic.com Rev.04 Apr.2016

6/14

UM1351

Typical Operating Characteristics

70

75

80

85

90

95

100

0

5

10

15

20

25

30

VIN (V)

Efficiency vs. Vin

(Rs=0.33Ω, L=100μH)

1LED

2LED

3LED

4LED

5LED

6LED

7LED

8LED

70

75

80

85

90

95

100

0

5

10

15

20

25

30

VIN (V)

Efficiency vs. Vin

(Rs=0.15

Ω, L=47μH)

1LED

2LED

3LED

4LED

5LED

6LED

7LED

8LED

0

100

200

300

400

500

600

700

800

0

5

10

15

20

25

30

35

VIN (V)

Operating Frequency vs. Vin

(Rs=0.15

Ω, L=47μH)

1LED

2LED

3LED

4LED

5LED

6LED

7LED

8LED

350

370

390

410

430

450

470

490

510

0

5

10

15

20

25

30

35

VIN (V)

Quiescent Current vs. Vin

0

5

10

15

20

25

30

35

40

0

5

10

15

20

25

30

35

VIN (V)

Shutdown Current vs. Vin

0

50

100

150

200

250

300

350

0

10

20

30

40

50

60

70

80

90

100

Duty Cycle (%)

LED Current vs. VSET Duty Cycle

(Vin=16V, 3 LEDs, 100

μH, Rs=0.33Ω)

PWM=100Hz

Efficiency vs. VIN

(Rs=0.33

Ω, L1=100µH)

Efficiency vs. VIN

(Rs=0.15

Ω, L1=47µH)

Operating Frequency vs. VIN

(Rs=0.15

Ω, L1=47µH)

Quiescent Current vs. VIN

Shutdown Current vs. VIN

LED Current vs. VSET Duty Cycle

(VIN=16V, 3 LEDs, 100µH, Rs=0.33Ω)

1LED

2LED

3LED

4LED

5LED

6LED

7LED

8LED

1LED

2LED

3LED

4LED

5LED

6LED

7LED

8LED

1LED

2LED

3LED

4LED

5LED

6LED

7LED

8LED

PWM=100Hz

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