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PDF BD8381AEFV-M Data sheet ( Hoja de datos )
| Número de pieza | BD8381AEFV-M | |
| Descripción | LED Drivers | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
LED Drivers for Automotive Light
BD8381AEFV-M
General Description
BD8381AEFV-M is a white LED driver with the
capability of withstanding high input voltage (50V MAX).
It has also an integrated current-mode, buck-boost
DC/DC controller to achieve stable operation against
high input voltage and to remove the constraint of the
number of LEDs in series connection.
The LED brightness is controlled by either linear or
PWM signal and is also possible to be controlled even
without using a microcomputer, but instead, by means
of the built-in PWM brightness signal generation circuit.
Key Specifications
Input Supply Voltage Range:
Operating Temperature Range:
5.0V to 30V
-40°C to +125°C
Package
W(Typ) x D(Typ) x H(Max)
Features
Integrated buck-boost current-mode DC/DC
controller
Built-in CR timer for PWM brightness
PWM linear brightness
Built-in protection functions (UVLO, OVP, TSD, OCP,
SCP)
LED error status detection function (OPEN/
SHORT)
HTSSOP-B28
9.70mm x 6.40mm x 1.00mm
Applications
Headlight and Daytime Running Light etc.
Typical Application Circuit and Block Diagram
Vin VREG
FAIL1
VCC
VREG
UVLO TSD
OVP
OCP
OVP
CS
EN
SYNC
RT
COMP
VREG
SS
INP1 INP2
THM
DRLIN
VREG
DISC
VTH
PWM
Timer
Latch
Control Logic
OSC SLOPE
PWM
OCP OVP
SS
ERR AMP
-
+
+
DRV
CTL
VREG
SHORT
Det
BOOT
OUTH
SW
DGND
OUTL
GND
LEDR
LEDC
PWMOUT
FB
CR
TIMER
OPEN/ SHORT/ SCP Detect
Timer
Latch
Open Det
SCP Det
FAIL2
PGND
CT
COUT
〇Product structure: Silicon monolithic integrated circuit
.www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
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TSZ02201-0T1T0C700160-1-2
31.Oct.2014 Rev.001
1 page  
BD8381AEFV-M
Typical Performance Curves
(Unless otherwise specified, Ta=25°C)
6
4
2
0
0 5 10 15 20 25 30 35 40 45 50
Power SuVpCpCly VVoollttaaggee:: [VVC]C [V]
Figure 1. Output Voltage vs Power Supply Voltage
(VREG Voltage Characteristic)
0.22
0.215
VCC=12V
0.21
0.205
0.2
0.195
0.19
0.185
0.18
-50
-25
0 25 50 75
Temperature: Ta [°C]
100 125
Figure 3. Output Voltage vs Temperature
(Standard Voltage Temperature Characteristic)
700
VCC=12V
600
500
RRT=100kohm
400
300
200
RRT=200kohm
100
0
-50
-25
0 25 50 75 100 125
TTEeMmPpEeRraAtTuUreR:ET:aTa[°[C℃]]
Figure 2. Oscillating Frequency vs Temperature
(fOSC Temperature Characteristic)
8.0
6.0
4.0
2.0
0.0
0
5 10 15 20 25 30 35 40 45 50
PoweSr SupupplpylyVoVlotaltgaeg:eV: CVCCC[V[V] ]
Figure 4. Circuit Current vs Power Supply Voltage
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/36
TSZ02201-0T1T0C700160-1-2
31.Oct.2014 Rev.001
5 Page 
BD8381AEFV-M
3. 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 4.5 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 = 10µF Typ) to the VREG terminal for phase compensation. Operation may become unstable if
CREG is not connected.
4. LED Current Setting and Control Method.
(1) Method of setting the LED current
The LED current can be calculated by the following formula.
THM ≥1.0V→ILED＝0.2V(Typ) / RSET
THM <1.0V→ILED＝VTHM / (GAIN x RSET)
(GAIN：the gain of internal AMP 5(Typ))
VCC
LED Current：ILED
THM terminal voltage：VTHM
Resistance of LED current setting：RSET
RSET=0.2Ω
1.0A
OUTH
SW
VOUT
OUTL
PWMOUT
FB
RSET
Figure 18. LED current setting block diagram
1.0V
DCDCIn入pu力t V電ol圧tag:eV：TVHTMHM[[V]
VDC
Figure 19. The LED current derating by THM terminal
(2) Linear dimming function
LED current can be controlled linearly by using the THM terminal which is commonly used as a derating function.
For example, THM terminal is used when suppressing the degradation at high temperature of the LED (Figure 20) and
controlling the excessive current to the external components under the conditions likely to occur in the power supply
voltage fluctuations in the idling stop function. VTHM input range is recommended VTHM ≥ 0.4V.
VREG
R1 DTHCM
R3 R2
product value
unit
VREG
R1
5
20
V
kΩ
R2 47 kΩ
R3 47 kΩ
R3:NTCG104BF473F
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
0 50 100
Temprature(℃)
150
Figure 20. The derating use case with thermistor resister.
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/36
TSZ02201-0T1T0C700160-1-2
31.Oct.2014 Rev.001
11 Page | ||
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| PDF Descargar | [ Datasheet BD8381AEFV-M.PDF ] | |
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