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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
Product structure: Silicon monolithic integrated circuit
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© 2014 ROHM Co., Ltd. All rights reserved.
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This product has no designed protection against radioactive rays
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BD8381AEFV-M
Pin Configuration
Pin Descriptions
(TOP VIEW)
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
Pin Symbol
Function
1 COMP Error amplifier output
2 SS Soft start setting input
3 VCC Input power supply
4 EN Enable input
5 RT Oscillation frequency-setting resistance input
6 SYNC External synchronization signal input
7 GND Small-signal GND
8 THM Thermally sensitive resistor connection pin
9 FB ERRAMP FB signal input pin
10 DISC CR Timer discharge pin
11 VTH CR Timer threshold pin
12 DRLIN DRL switch pin (Pulse output setting pin)
13 FAIL1 Failure signal output
14 FAIL2 LED open/short detection signal output
15 OVP Over-voltage detection input
16 LEDC LED short detection pin (LED detection side)
17 LEDR LED short detection pin (Resistor detection side)
18 N.C.
-
19 PGND PWM brightness source pin
20 PWMOUT PWM brightness signal output pin
21 CT GND short protection timer setting pin
22 OUTL Low-side external FET Gate Drive out put
23 DGND Low-side FET driver source pin
24 SW High-side FET Source pin
25 OUTH High-side external FET Gate Drive out put
26 CS DC/DC output current detection pin
27 BOOT High-side FET driver source pin
28 VREG Internal reference voltage output
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BD8381AEFV-M
Absolute Maximum Ratings (Ta=25°C)
Parameter
Power Supply Voltage
Boot Voltage
SW,CS,OUTH Voltage
BOOT-SW Voltage
Symbol
VCC
VBOOT
VSW, VCS, VOUTH
VBOOT-SW
Rating
50
55
50
7
Unit
V
V
V
V
VREG,OVP,OUTL,FAIL1,FAIL2,THM,SS,
COMP,RT,SYNC,EN,DISC,VTH,FB,LEDR,
LEDC,DRLIN, PWMOUT,CT Voltage
VREG, VOVP, VOUTL, VFAIL1,
VFAIL2, VTHM, VSS,
VCOMP, VRT, VSYNC, VEN,
VDISC, VVTH, VFB, VLEDR,
VLEDC, VDRLIN, VPWMOUT, VCT
-0.3 to +7 < VCC
V
Power Consumption
Pd
1.45 (Note 1)
W
Operating Temperature Range
Topr
-40 to +125
°C
Storage Temperature Range
Tstg
-55 to +150
°C
Junction Temperature
Tjmax
150 °C
(Note 1) IC mounted on glass epoxy board measuring 70mm x 70mm x 1.6mm, power dissipated at a rate of 11.60mW/°C at temperatures above 25°C.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated
over the absolute maximum ratings..
Recommended Operating Conditions (Ta=25°C)
Parameter
Symbol
Rating
Power Supply Voltage
VCC 5.0 to 30
Oscillating Frequency Range
External Synchronization Frequency Range
(Note 2) (Note 3)
fOSC
fSYNC
100 to 600
fOSC to 600
External Synchronization Pulse Duty Range
fSDUTY
40 to 60
(Note 2) Connect SYNC to GND or OPEN when not using external frequency synchronization.
(Note 3) Do not switch between internal and external synchronization when an external synchronization signal is input to the device.
Unit
V
kHz
kHz
%
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BD8381AEFV-M
Electrical Characteristics (Unless otherwise specified, VCC=12V Ta=25°C)
Parameter
Symbol
Limit
Min Typ Max
Circuit Current
ICC - 4.5 7.0
Standby Current
[VREG Block (VREG)]
Reference Voltage
[OUTH Block]
OUTH High-Side ON-Resistance
OUTH Low-Side ON-Resistance
Over-Current Protection
Operating Voltage
SS Charge Current
[OUTL Block]
OUTL High-Side ON-Resistance
OUTL Low Side ON-Resistance
[SW Block]
SW Low -Side ON-Resistance
[PWMOUT Block]
PWMOUT High-Side ON-Resistance
PWMOUT Low-Side ON-Resistance
[Error Amplifier Block]
Reference Voltage1
Reference Voltage2
The Amount of Change of VREF
by Temperature
COMP Sink Current
COMP Source Current
Max Duty Output
[Oscillator Block]
Oscillating Frequency
[OVP Block]
Over-Voltage Detection
Reference Voltage
OVP Hysteresis Width
[UVLO Block ]
UVLO Voltage
UVLO Hysteresis Width
[PWM Generation Circuit Block]
VTH Threshold Voltage
VTH Threshold Voltage
PWM Minimum ON Width
LED OPEN Detection Function
LED SHORT Detection Function
LED GND Short Protection Timer
[Logic Inputs]
Input HIGH Voltage
Input LOW Voltage
Input Current 1
Input Current 2
[FAIL Output (Open Drain) ]
Fail LOW Voltage
ISTBY
VREG
RONHH
RONHL
VOLIMIT
ISS
RONLH
RONLL
RONSW
RONPWMH
RONPWML
VREF1
VREF2
dVREF2
ICOMPSINK
ICOMPSOURCE
Dmax
fOSC
VOVP
VOHYS
VUVLO
VUHYS
VTH1
VTH2
tPWMON
VOPEN
VSHORT
tSHORT
VINH
VINL
IIN
IEN
VOL
- 08
4.5 5.0 5.5
1.5
1.0
VCC
-0.68
3
3.5
2.5
VCC
-0.60
5
7.0
5.0
VCC
-0.52
7
2.0 4.0 8.0
1.0 2.5 5.0
2.0 4.5 9.0
2.0 4.0 8.0
1.0 2.5 5.0
0.194 0.200 0.206
0.190 0.200 0.210
-0.090 -0.045 -0.003
50 75 100
-100 -75 -50
83 90
-
285 300 315
1.9 2.0 2.1
0.45 0.55 0.65
4.0 4.35 4.7
50 150 250
3 2/3VREG 3.7
1 1/3VREG 2
25 -
-
30 50 70
100 200 400
100 150 200
3.0
GND
20
15
-
-
35
30
-
1.0
50
45
- 0.1 0.2
Unit
mA
µA
V
Ω
Ω
V
µA
Ω
Ω
Ω
Ω
Ω
V
V
mV/°C
µA
µA
%
KHz
V
V
V
mV
V
V
µs
mV
mV
ms
V
V
µA
µA
V
Conditions
EN=Hi, SYNC=Hi,
RT=OPEN, CIN=10µF
EN=Low
IREG=-5mA, CREG=10µF
ION=-10mA
ION=10mA
VSS=0V
ION=-10mA
ION=10mA
IONSW=10mA
IONPWMH=-10mA
IONPWML=10mA
FB-COMP Short,1MΩ/250kΩ
FB-COMP Short,1MΩ/250kΩ
Ta=-40°C to +125°C
VFB=0.4V, VCOMP=1V
VFB=0V, VCOMP=1V
fOSC=300kHz
RRT=200kΩ
VOVP=Sweep up
VOVP= Sweep down
VCC= Sweep down
VCC= Sweep up
VSHORT lVLEDR-VLEDCl
CCT=0.1µF
VIN=5V (SYNC/DRLIN)
VEN=5V (EN)
IOL=0.1mA
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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
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TSZ02201-0T1T0C700160-1-2
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