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PDF BD8112EFV-M Data sheet ( Hoja de datos )
| Número de pieza | BD8112EFV-M | |
| Descripción | White Backlight LED Drivers | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Power Management ICs for Automotive Body Control
White Backlight LED Drivers
for Medium to Large LCD Panels
(Switching Regulator Type)
BD8112EFV-M
No.11039ECT11
●Description
BD8112EFV-M is a white LED driver with the capability of withstanding high input voltage (36V MAX). This driver has
2ch constant-current drivers integrated in 1-chip, which each channel can draw up to 150mA max, so that high brightness
LED driving can be realized. Furthermore, a current-mode buck-boost DC/DC controller is also integrated to achieve stable
operation against voltage input and also to remove the constraint of the number of LEDs in series connection.
The brightness can be controlled by either PWM or VDAC techniques.
●Features
1) Input voltage range 5.0 -30 V
2) Integrated buck-boost current-mode DC/DC controller
3) Two integrated LED current driver channels (150 mA max. each channel)
4) PWM Light Modulation (Minimum Pulse Width 25µs)
5) Oscillation frequency accuracy ±5%
6) Built-in protection functions (UVLO, OVP, TSD, OCP, SCP)
7) LED abnormal status detection function (OPEN/ SHORT)
8) HTSSOP-B24 package
●Applications
Backlight for display audio, small type panels, etc.
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Ratings
Unit
Power supply voltage
VCC 36 V
BOOT , OUTH Voltage
SW, CS Voltage
VBOOT, VOUTH
VSW, VCS
41 V
36 V
BOOT-SW Voltage
VBOOT-SW
LED output voltage
VLED1,2
VREG, OVP, OUTL, FAIL1, FAIL2,
LEDEN, ISET, VDAC, PWM, SS, COMP,
RT, SYNC, EN voltage
VVREG, VOVP, VOUTL, VFAIL1, VFAIL2,
VLEDEN, VISET, VVDAC, VPWM, VSS, VCOMP,
VRT, VSYNC, VEN
Power Consumption
Pd
7
36
-0.3～7 < VCC
1.10 *1
V
V
V
W
Operating temperature range
Topr
-40～+105
℃
Storage temperature range
Tstg
-55～+150
℃
LED maximum output current
ILED
150 *2 *3
mA
Junction temperature
Tjmax
150 ℃
*1 IC mounted on glass epoxy board measuring 70mm × 70mm × 1.6mm, power dissipated at a rate of 8.8mw/℃ at temperatures above 25℃.
*2 Dispersion figures for LED maximum output current and VF are correlated. Please refer to data on separate sheet.
*3 Amount of current per channel.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/22
2011.08 - Rev.C
1 page  
BD8112EFV-M
●Block diagram and pin configuration
Vin
CIN
VCC
EN
VREG
UVLO TSD
VREG
PWM
OVP
Timer
Latch
Control Logic
SYNC
CRT RT
RT
OSC
SLOPE
－
PWM
＋
OCP
DRV
CTL
COMP
Ccomp
RPC
CPC
SS
CSS
OCP OVP
SS
ERR AMP
－
－
＋
PWM
Current driver
＋
－
VREG
OVP
CS
FAIL1
BOOT
OUTH
SW
DGND
OUTL
GND
LED1
LED2
VDAC
RISET
ISET
ISET
Open Short Detect
Timer
Latch
Open Det
Short Det
LEDEN
Fig.13
PGND
FAIL2
Technical Note
COUT
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/22
2011.08 - Rev.C
5 Page 
BD8112EFV-M
●Protection Sequence
VCC
＊1
EN
VREG
UVLO
＊1
VDAC
＊2
SYNC
＊2
PWM
SS
ILED1
ILED2
ILED1'
ILED2'
VLED1
VLED2
VLED1'
VLED2'
VOVP
FAIL1 ＊4
FAIL2
4.45V
①
②
④
1.0Ｖ
<0.3Ｖ
>4.5 Ｖ
100ms ＊3
1.7V
100ms ＊3
0.3V
2.0V
③
Technical Note
*1 After VCC voltage reached to operating conditions, set VDAC voltage, and turn on the EN.
After VREG≧4.6V, turn on SYNC and PWM inputs.
*2 Don’t care input sequence PWM and SYNC.
*3 Aprox 100ms of delay when Fosc = 300kHz
*4 When FAIL1 pull-up to outside power supply.
① Case for LED2 in open-mode
When VLED2<0.3V and VOVP>1.7V simultaneously, then LED2 becomes off and FAIL2 becomes low
② Case for LED1’ in short-mode
When VLED1’>4.5V and VOVP<1.6V simultaneously, then LED1’ becomes off after 100ms approx
③ Case for LED2’ in short to GND
③-1 DCDC output voltage increases, and then SS discharges and FAIL1 becomes low
③-2 Detects VLED2’<0.3V and shuts down after 100ms approx
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/22
2011.08 - Rev.C
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet BD8112EFV-M.PDF ] | |
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