BD6072HFN datasheet(11/30 Pages) ROHM

Part #	BD6072HFN

Description	White Backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type)

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Manufacturer	ROHM [Rohm]

Direct Link	http://www.rohm.com

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11 / 30 page

Technical Note

11/29

www.rohm.com

2011.01 - Rev.C

BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN

►BD6071HFN

●

Electrical characteristic curves (Reference data)

( 4ms/div )

IIN

200mA/div

ILED

20mA/div

VOUT

5V/div

EN

2V/div

Fig.31 Soft Start

( VIN = 3.6V, Ta = 25℃, 3LED, 20mA Load )

Fig.32 LED Open output voltage

Fig.33 LED luminance adjustment

( VIN = 3.6V, Ta = 25℃, 3LED, 20mA Load )

Fig.26 Efficiency vs. LED current

< 2LED > (VOUT=7.5V, Ta=25℃)

Fig.25 Efficiency vs. LED current in each coil

< 3LED > (VOUT=10.5V, VIN=3.6V, Ta=25℃)

Fig.24 Efficiency vs. LED current in each coil

< 2LED > (VOUT=7.5V, VIN=3.6V, Ta=25℃)

Fig.27 Efficiency vs. LED current

< 3LED > (VOUT=10.5V, VIN=3.6V, Ta=25℃)

Fig.29 Output power vs. power

source voltage

Fig.28 Inductor current limits vs.

Temperature

Fig.30 Feedback voltage vs.

Power source voltage

( 100µs/div )

IIN

100mA/dev

VOUT

10V/div

VFB

0.5V/div

EN

5V/div

10ms

Ave IIN =1.5mA

⊿

V=1.57V

( 4ms/div )

IIN

200mA/div

VOUT

1V/div

60

65

70

75

80

85

90

10

15

20

25

30

35

40

ILED [mA]

CoilCraft : DO1608C-223

TDK:VLCF4020T-220MR56

MURATA:LQH32CN220K53

TDK:VLF3012AT-220MR33

60

65

70

75

80

85

90

10

15

20

25

30

35

40

ILED [mA]

CoilCraft : DO1608C-223

TDK:VLCF4020T-220MR56

MURATA:LQH32CN220K53

TDK:VLF3012AT-220MR33

60

65

70

75

80

85

90

10

15

20

25

30

35

40

ILED [mA]

VIN=5.5V

VIN=3.1V

VIN=4.5V

VIN=3.6V

200

220

240

260

280

300

320

340

-30

-10

10

30

50

70

90

Temparature [℃]

VIN=5.5V

VIN=3.1V

VIN=3.6V

60

65

70

75

80

85

90

10

15

20

25

30

35

40

ILED [mA]

VIN=5.5V

VIN=3.1V

VIN=4.5V

VIN=3.6V

0

500

1000

1500

2000

2.5

3

3.5

4

4.5

VIN [V]

Ta=85℃

Ta=25℃

Ta=-30℃

0.47

0.48

0.49

0.5

0.51

0.52

0.53

2.53

3.544.5

55.5

VIN [V]

Ta=85℃

Ta=25℃

Ta=-30℃

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