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PDF BD6581GU Data sheet ( Hoja de datos )
| Número de pieza | BD6581GU | |
| Descripción | 6-Channel White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
6-Channel White LED Driver
for up to 72 LEDs
BD6581GU
General Description
BD6581GU is white LED driver IC with PWM step-up
DC/DC converter that can boost max 42.5V and
current driver that can drive max 25mA. The wide and
precision brightness can be controlled by external
PWM pulse.
BD6581GU has very accurate current drivers, and it
has few current errors between each strings.
So, it will be helpful to reduce brightness spots on the
LCD.
Small package type is suited for saving space.
Key Specification
Operating power supply voltage range: 2.7V ~ 22.0V
Quiescent Current 1:
0.6μA (Typ.)
Quiescent Current 2:
4.6μA (Typ.)
Operating temperature range:
-30 ~+85
Package
VCSP85H2:
W(Typ.) x D(Typ.) x H (Max.)
2.60mm x 2.60mm x 1.00mm
[bottom view]
Features
High efficiency PWM step-up DC/DC converter
(fsw=1MHz), max efficiency 93%
High accuracy & good matching ( 1.5%) current
drivers 6ch
Drive up to 12 in series, 6 strings in parallel =72
white LEDs ( white LED Vf=3.5Vmax)
Rich safety functions
Over-voltage protection (OVP)
Over current limit
External SBD open detect
Thermal shutdown
E LED6
LED5
LED4
LED3
LED2
D RSTB
GND FAILSEL GND
LED1
C VBAT PWMPOW VREG
ISETL PWMDRV
B N.C
-
TEST
ISETH
GND
A VDET
N.C
SW SENSP SENSN
12345
Application
All middle size LCD equipments backlight of Notebook
PC, portable DVD player, car navigation systems, etc.
Typical Application Circuit
Battery
10μF
4.7μH
2 .2μF *
RTR020N05
100mΩ
Power
ON/OFF
200Hz
PWM
1μF
SW
SENSP
FAILSEL VDET
SENSN
RSTB BD6581GU
PWMPOW
LED1
PWMDRV
VBAT
LED2
LED3
LED4
VREG
LED5
GN GNDGNDGNDTESTISETHISETLLED6
24kΩ
10LED x6parallel
Each 20mA
Figure 1. Typical Application Circuit
Product structure Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product is not designed protection against radioactive rays
1/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
1 page  
BD6581GU
Block Diagram
RSTB
PW MP OW
FA ILS EL
SW
SE NSP
S ENS N
V BAT
VR EG
300kΩ
500 kΩ
REG
TSD
V IN detector
Internal P ower sup lly
S BD Open protect
+
-
UVLO
300 kΩ
1M Ω
S
QR
10 0K Ω Curre nt
S en se
over voltage protect +
-
C ontrol
se nse
PW Mcomp
-
+
+
ERRA MP-
-
-
-
-
-
+
O SC
TES T
PW M DRV
ISE TH
IS ETL
LE D TERM INA L
D etec t
10 0k Ω
30 0k Ω
IS E T H
Resisto r driver
IS E T L
Resisto r driver
LED TE RM INA L
Over Voltag e P ro tect
PW MDRV=H
On
PW MDRV=L
On
+
-
Current Driver
G ND G ND G ND GN D
Pin number 23pin
Figure 3. Block Diagram
Datasheet
VDE T
LED 1
LE D2
LED 3
LE D4
LE D5
LE D6
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
5/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
5 Page 
BD6581GU
Typical Performance Curves - continued
Datasheet
Figure 24. Line Transient (22V to 10V)
Figure 25. VOUT@OVP
(LED OPEN)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
11/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
11 Page | ||
| Páginas | Total 35 Páginas | |
| PDF Descargar | [ Datasheet BD6581GU.PDF ] | |
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