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BD6583MUV-A

White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type)

ROHM Semiconductor 

BD6583MUV-A

Technical Note

3.0

2.0

1.0

Max Matching = Max LED Current/Average Current

0.0

-1.0

Min Matching = Min LED Current/Average Current

-2.0

-3.0

0% 20% 40% 60% 80% 100%

PWM HI Duty (%)

Fig.13

LED current matching vs PWMDRV H Duty

PWM = 200Hz

3.0

2.0

1.0

Max Matching = Max LED Current/Average Current

0.0

-1.0

-2.0

Min Matching = Min LED Current/Average Current

-3.0

0%

2% 4% 6% 8% 10%

PWM HI Duty (%)

Fig.14

LED current matching vs PWMDRV H Duty

(Expansion) PWM = 200Hz

PWMDRV

VOUT

350mV

LED Current

10mA/div

Fig.15

VOUT response

Driver Control PWM (PWMDRV)

3.0

2.0

1.0

Max Matching = Max LED Current/Average Current

0.0

-1.0

-2.0

Min Matching = Min LED Current/Average Current

-3.0

0% 20% 40% 60% 80% 100%

PWM HI Duty (%)

Fig.16

LED current matching vs PWMPOW H Duty

PWM = 200Hz

3.0

2.0

Max Matching = Max LED Current/Average Current

1.0

0.0

-1.0

-2.0

Min Matching = Min LED Current/Average Current

-3.0

0% 2% 4% 6% 8% 10%

PWM HI Duty (%)

Fig.17

LED current matching vs PWMPOW H Duty

(Expansion) PWM = 200Hz

PWMPOW

VOUT

LED Current

180mV

10mA/div

Fig.18

VOUT response

Power Control PWM (PWMPOW)

16.30

16.25

16.20

16.15

16.10

16.05

16.00

15.95

15.90

15.85

15.80

15.75

15.70

5V

7V 12V

22V

2.7V

-60 -40 -20 0 20 40 60 80 100 120

VBAT

VOUT

LED current

400μs

No peak

temp [[℃oC]]

Fig.19

LED current vs Temperature

PWMDRV=H, ISETH=30kΩ (16mA setting)

Fig.20

Line Transient (10V to 22V)

VBAT

VOUT

LED current

No peak

14ms

Fig.21

Line Transient (22V to 10V)

VOUT

Icc

Fig.22

VOUT@OVP (LED OPEN)

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© 2011 ROHM Co., Ltd. All rights reserved.

4/26

2011.06 - Rev.C

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