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BD8112EFV-M PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD8112EFV-M
기능 White Backlight LED Drivers
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BD8112EFV-M 데이터시트, 핀배열, 회로
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
-0.37 < 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.
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© 2010 ROHM Co., Ltd. All rights reserved.
1/22
2011.08 - Rev.C




BD8112EFV-M pdf, 반도체, 판매, 대치품
BD8112EFV-M
Technical Note
Electrical characteristic curves (Reference data) (Unless otherwise specified, Ta=25)
5.5
5.3
Vcc= 12V
5.1
400
Vcc= 12V
360
320
400
360
320
Vcc= 12V
4.9 280 280
4.7
4.5
-40
-15 10 35 60 85
TEMPERATURE:Ta []
Fig.1 VREG temperature
characteristic
240
Fig.3 OSC 温度特性
200
-40
-15 10 35 60 85
TEMPERATURE:Ta []
Fig.2 OSC temperature
characteristic
240
200
-40
-15 10 35 60 85
TEMPERATURE:Ta []
Fig.3 ILED depend on VLED
55
53
Vcc= 12V
51
49
47
45
-40
-15 10 35 60 85
TEMPERATURE:Ta [℃]
Fig.4 ILED temperature
characteristic
50
40
30
20
10
0
0 0.5 1 1.5 2
VDAC VOLTAGE:VDAC[V]
Fig.5 VDAC Gain
5
4
3
2
1
0
0 0.02 0.04 0.06 0.08 0.1
VDAC VOLTAGE:VDAC[V]
Fig.6 VDAC Gain
100
85
70
VCC=30V
55
40
25
50
100 150 200
Total_Io [mA]
250
Fig.7 Efficiency
(LED2 Parallel 5 step)
100
85
VCC=12V
70
55
40
25
50
100 150 200 250
OUTPUT CURRENT [mA]
Fig.8 Efficiency
(LED2 Parallel 7 step)
6.0
4.0
Vcc=12V
2.0
0.0
0
6 12 18 24 30
SUPPLY VOLTAGE:Vcc [V]
Fig.9 Circuit Current
(Switching OFF)
36
0.66
0.64
0.62
0.60
0.58
VCC=12V
0.56
0.54
-40 -15 10 35 60
TEMPERATURE:Ta [℃]
85
Fig.10 Overcurrent detecting voltage
temperature characteristic
10
8
6
4
2
0
012345
EN VOLTAGE:VEN [V]
Fig.11 EN threshold voltage
10
8
6
4
2
0
01 23 45
PWM VOLTAGE:VEN [V]
Fig.12 PWM threshold voltage
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
4/22
2011.08 - Rev.C

4페이지










BD8112EFV-M 전자부품, 판매, 대치품
BD8112EFV-M
Technical Note
5V voltage reference (VREG)
5V (Typ.) is generated from the VCC input voltage when the enable pin is set high. This voltage is used to power internal
circuitry, as well as the voltage source for device pins that need to be fixed to a logical HIGH. UVLO protection is integrated
into the VREG pin. The voltage regulation circuitry operates uninterrupted for output voltages higher than 4.45 V (Typ.),
but if output voltage drops to 4.3 V (Typ.) or lower, UVLO engages and turns the IC off. Connect a capacitor (Creg = 2.2µF
Typ.) to the VREG terminal for phase compensation. Operation may become unstable if Creg is not connected.
Constant-current LED drivers
If less than four constant-current drivers are used, unused channels should be switched off via the LEDEN pin configuration.
The truth table for these pins is shown below. If a driver output is enabled but not used (i.e. left open), the IC’s open
circuit-detection circuitry will operate. Please keep the unused pins open. The LEDEN terminals are pulled down internally
in the IC, so if left open, the IC will recognize them as logic LO. However, they should be connected directly to VREG or
fixed to a logic HI when in use.
LED EN
L
H
LED
12
ON ON
ON OFF
Output current setting
LED current is computed via the following equation:
ILED = min[VDAC , VISET(=2.0V)] / RSET x GAIN [A]
(min[VDAC , 2.0V] = the smaller value of either VDAC or VISET; GAIN = set by internal circuitry.)
In applications where an external signal is used for output current control, a control voltage in the range of 0.0 to 2.0 V
can be connected on the VDAC pin to control according to the above equation. If an external control signal is not used,
connect the VDAC pin to VREG (do not leave the pin open as this may cause the IC to malfunction). Also, do not switch
individual channels on or off via the LEDEN pin while operating in PWM mode.
The following diagram illustrates the relation between ILED and GAIN.
ILED vs GAIN
3150
3100
3050
3000
2950
2900
2850
0
20 40 60 80 100 120 140 160
ILED[mA]
In PWM intensity control mode, the ON/OFF state of each current driver is controlled directly by the input signal on the
PWM pin; thus, the duty ratio of the input signal on the PWM pin equals the duty ratio of the LED current. When not
controlling intensity via PWM, fix the PWM terminal to a high voltage (100%). Output light intensity is greatest at 100%
input.
PWM
PWM
ILED(50mA/div)
ILED
PWM=150Hz Duty=0.
PWM=150Hz Duty=50%
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© 2010 ROHM Co., Ltd. All rights reserved.
7/22
2011.08 - Rev.C

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BD8112EFV-M

White Backlight LED Drivers

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