Datasheet
Constant Current LED Drivers for Automotive
Constant Current Controller
for Automotive LED Lamps
BD18340FV-M
General Description
BD18340FV-M/BD18341FV-M are 70V-withstanding
Constant Current Controller for Automotive LED Lamps.
It is able to drive at maximum 10 rows of PNP transistors.
It can also contribute to reduction in the consumption
power of the set as it has the integrated standby function.,
The IC also incorporates a highly reliable, in-built
de-rating function, LED Open Detection, Short Circuit
Protection and Over Voltage Mute function and LED
failure input/output function.
BD18341FV-M
Key Specifications
Input Voltage Range：
4.5V to 19V
FB Terminal Voltage Accuracy：
650mV ±3%
@Ta = 25°C to 125°C
Stand-by Current：
0µA(Typ)
LED Current De-rating Accuracy：
BD18340FV-M :
±
5% @V
DCDIM
=0.5 to 0.75V
BD18341FV-M :
±12%
@V
DCDIM
=0.5 to 0.75V
Operating Temparature Range：
-40°C to +125°C
Features
AEC-Q100 Qualified
(Note1)
LED Constant-Current Controller
PWM Dimming Function
LED Current De-rating Function
LED Open Detection
Short Circuit Protection(SCP)
Over Voltage Mute Function(OVM)
Disable LED Open Detection Function at
Reduced-Voltage
Abnormal Output Detection and Output Functions
(Note1: Grade1)
Package
SSOP-B16
W(Typ) x D(Typ) x H(Max)
5.00mm x 6.40mm x 1.35mm
Applications
Automotive LED Exterior Lamp
(Rear Lamp, Turn Lamp, DRL/Position Lamp,
Fog Lamp etc.)
Automotive LED Interior Lamp
(Air Conditioner Lamp, Interior Lamp,
Cluster Light etc.)
SSOP-B16
Typical Application Circuit
R
FB1
R
FB2
R
LIM
PWM_in
VIN
D1
Z
D1
D2
C
VIN1
C
VIN2
FB
BASE
OP
EN
CRT
DC_in
D3
C
CRT
R
CRT
DISC
R
DCIN
C
D
D
BD18340FV-M
BD18341FV-M
SCP
VREG
C
VREG
C
LED
PWMOUT
PBUS
GND
OPM
DCDIM
R
OPM
R
DCDIM
NTC
〇Product
structure : Silicon monolithic integrated circuit
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©2016 ROHM Co., Ltd. All rights reserved.
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〇This
product has no designed protection against radioactive rays
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TSZ02201-0T1T0C700180-1-2
2016.04.21 Rev.002
BD18340FV-M
Pin Configuration
BD18341FV-M
Datasheet
(TOP VIEW)
FB
BASE
N.C.
OP
SCP
GND
PBUS
PWMOUT
1
2
3
4
5
6
7
8
Function
Pin
No.
9
10
11
12
13
14
15
16
Pin
Name
OPM
16
15
14
13
12
11
10
9
VIN
EN
DISC
CRT
D
DCDIM
VREG
OPM
Pin Description
Pin
No.
1
2
3
4
5
6
7
8
Pin
Name
FB
BASE
N.C.
OP
SCP
GND
PBUS
PWMOUT
Function
The terminal to set
Disable LED open detection voltage
Internal reference voltage
The terminal to set
DC dimming
The terminal to set
Disable LED open detection time
The terminal to set
CR timer
Discharge terminal for
CR timer
Enable input
Power supply input
Input terminal for feedback voltage
The terminal for connecting
PNP Tr. BASE
Pin not connected internally.
(Note 1)
The terminal
for LED open detection
The terminal
for short circuit protection
GND
The terminal
Abnormal Output Detection and Output
CR timer signal output
VREG
DCDIM
D
CRT
DISC
EN
VIN
(Note 1)
Please be sure to floating at N.C. pin
Block Diagram
VREG
VIN
FB
EN
VREG
Over
Voltage
Mute
BASE
VREF
OPENLOAD
V
I N
PBUS
V
RE G
PBUS
OP
V
IN
1mA
OPM
V
RE G
OPEN
MASK
Control
Logic
SCP
1.2V
D
D COMP
1.0V
V
RE G
DELAY
20µs
DELAY
Rise 1µs
1.2V
⇔1.25V
SCP
DC Dimming
DCDIM
CRT
DISC
CR
TIMER
1.0V
PWMOUT
GND
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TSZ02201-0T1T0C700180-1-2
2016.04.21 Rev.002
BD18340FV-M
BD18341FV-M
Datasheet
Absolute Maximum Ratings (Ta=25°C)
Parameter
Supply Voltage
EN,CRT, DISC Terminal Voltage
FB,BASE,OP,SCP Terminal Voltage
VIN-FB, VIN-BASE
Voltage across Terminals
PBUS,VREG
DCDIM Terminal Voltage
PWMOUT, OPM, D Terminal Voltage
Operating Temperature Range
Storage Temperature Range
Junction Temperature
Symbol
V
IN
V
EN
, V
CRT,
V
DISC
V
FB
, V
BASE
, V
OP
,V
SCP
V
IN
-V
FB
,V
IN
-V
BASE
V
PBUS
, V
REG,
V
DCDIM
V
PWMOUT
, V
OPM
, V
D
T
opr
T
stg
T
jmax
Rating
-0.3 to +70
-0.3 to +70
-0.3 to V
IN
+0.3V
-0.3 to +5.0
-0.3 to +7.0
-0.3 to V
REG
+0.3
-40 to 125
-55 to 150
150
Unit
V
V
V
V
V
V
°C
°C
°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.
Thermal Resistance
(Note2)
Parameter
SSOP-B16
Junction to Ambient
Junction to Top Characterization Parameter
(Note 3)
θ
JA
Ψ
JT
140.9
6
77.2
5
°C/W
°C/W
Symbol
Thermal Resistance (Typ)
1s
(Note4)
2s2p
(Note5)
Unit
(Note2)
Based on JESD51-2A (Still-Air),
(Note3)
The thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of
the outside surface of the component package.
(Note4)
Using a PCB board based on JESD51-3.
Layer Number of
Measurement Board
Single
Top
Copper Pattern
Footprints and Traces
Layer Number of
Measurement Board
4 Layers
Top
Copper Pattern
Footprints and Traces
Material
FR-4
Board Size
114.3mm x 76.2mm x
1.57mmt
Thickness
70μm
(Note5)
Using a PCB board based on JESD51-7
Material
FR-4
Thickness
70μm
Board Size
114.3mm x 76.2mm x 1.6mmt
2 Internal Layers
Copper Pattern
74.2mm x 74.2mm
Thickness
35μm
Bottom
Copper Pattern
74.2mm x 74.2mm
Thickness
70μm
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TSZ02201-0T1T0C700180-1-2
2016.04.21 Rev.002
BD18340FV-M
BD18341FV-M
Datasheet
Recommended Operating Conditions (Ta=-40°C to +125°C)
Parameter
Supply Voltage
(Note1) (Note2)
CRTIMER Frequency Range
PWM Minimum Pulse Width
(Note3)
Symbol
V
IN
f
PW M
t
MIN
Min
4.5
100
10
Typ
13
-
-
Max
19
5000
-
Unit
V
Hz
µs
(Note1)
ASO should not be exceeded
(Note2)
At start-up time, please apply a voltage above 5V once. The value is the voltage range after the temporary rise to 5V.
(Note3)
At connecting the External PNP Tr.(2SAR573D(ROHM) ,1pcs), That is the same when the Pulse input to CRT terminal.
Operating Conditions
Parameter
The Capacitor
connecting VIN Terminal1
The Capacitor
connecting VIN Terminal2
The Capacitor
connecting VREG Terminal
The Capacitor
connecting LED Anode
The Capacitor
connecting CRT Terminal
The Resistor
connecting CRT Terminal
The Resistor
for setting LED Current LED
The Resistor
for setting Disable LED Open
Detection Voltage
The Resistor
for setting DC Dimming
The Resistor
for DCIN pull-down
The Capacitor
for setting Disable LED Open
Detection Time
The Resistor for limiting
Base Terminal Current
The External PNP Transistor
Symbol
C
VIN1
C
VIN2 (Note4)
C
VREG (Note5)
C
LED
C
CRT
R
CRT
R
FB1
, R
FB2 (Note6)
R
OPM
R
DCDIM
R
DCIN
C
D (Note5)
R
LIM
Q
1
Min
1.0
0.047
1.0
0.1
0.01
0.1
0.8
25
4.7
-
0.001
Max
-
-
4.7
0.68
0.22
50
6.5
55
50
10
0.1
Unit
μF
μF
μF
μF
μF
kΩ
Ω
kΩ
kΩ
kΩ
μF
Ω
-
See
Features
Description 5
(Note7)
(Note4)
ROHM Recommended Value (0.1μF GCM188R11H104KA42 murata)
(Note5)
Ceramic capacitor recommended. Please setting the Disable LED Open Detection Time less than PWM minimum pulse width.
(Note6)
At connecting the External PNP Tr. (2SAR573D (ROHM), 1pcs)
(Note7)
For external PNP transistor, please use the recommended device 2SAR573D for this IC.
While using non-recommended part device, validate the design on actual board.
Please check hfe of the part to design base current limit resistor. (See Features Description, section 5).
As for parasitic capacitance, please evaluate over shoot of I
LED
on actual board. (See Features Description, Section 8 -Evaluation example, ILED pulse
width at PWM Dimming operation).
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TSZ02201-0T1T0C700180-1-2
2016.04.21 Rev.002
BD18340FV-M
BD18341FV-M
Datasheet
Electrical Characteristics1
(Unless otherwise specified
Ta = -40 to +125°C, V
IN
= 13V, C
VREG
= 1.0µF, Transistor PNP = 2SAR573D)
Parameter
[ Circuit Current I
VIN
]
Circuit Current
at Stand-by Mode
Circuit Current
at Normal Mode
Circuit Current
at LED Open Detection
Circuit Current
at PBUS=Low
[ VREG Voltage ]
4.85
VREG Terminal Voltage
VREG Terminal
Current Capability
[ DRV ]
V
REG
4.75
I
VREG
-1.0
5.00
-
5.25
-
V
mA
V
FBREG
= V
IN
- V
FB
R
FB1
= R
FB2
= 1.8Ω,
Ta = 25 to 125°C
V
FBREG
= V
IN
- V
FB
R
FB1
= R
FB2
= 1.8Ω,
Ta = -40 to 125°C
V
FB
= V
IN
V
FB
= V
IN
, V
BASE
= V
IN
- 1.5V
Ta = 25°C
V
CRT
= 0V
V
FB
= V
IN
, V
BASE
= V
IN
- 1.0V
⊿V
FBREG
/
⊿V
DCDIM
V
DCDIM
：0.75V
-> 0.35V
5.00
5.15
V
I
VREG
= -100μA
Ta = 25 to 125°C
I
VREG
= -100μA
Ta = -40 to 125°C
I
VIN1
I
VIN2
I
VIN3
I
VIN4
-
-
-
-
0
2.0
2.0
2.0
10
5.0
5.0
5.0
μA
mA
mA
mA
V
EN
= 0V
V
FB
=V
IN
V
EN
= V
IN
, V
FB
=V
IN
-1.0V
Base current subtracted
V
EN
= V
IN
, V
FB
=V
IN
-1.0V
at LED Open Detection
V
EN
= V
IN
, V
FB
=V
IN
-1.0V
V
PBUS
= 0V
Symbol
Limit
Min
Typ
Max
Unit
Conditions
630
FB Terminal Voltage
V
FBREG
617
FB Terminal
Input Current
BASE Terminal Sink
Current Capability
BASE Terminal
Pull-up Resistor
I
FB
I
BASE
R
BASE
7.5
10
0.5
650
650
15
-
1.0
670
683
30
-
1.5
mV
mV
μA
mA
kΩ
[ LED Current De-rating Function (DC Dimming Function) ]
DC Dimming Gain
BD18340FV-M
FB Terminal Voltage
V
DCDIM
= 0.75V
FB Terminal Voltage
V
DCDIM
= 0.50V
FB Terminal Voltage
V
DCDIM
= 0.35V
BD18341FV-M
FB Terminal Voltage
V
DCDIM
= 0.75V
FB Terminal Voltage
V
DCDIM
= 0.50V
FB Terminal Voltage
V
DCDIM
= 0.35V
V
FB_DC1
V
FB_DC2
V
FB_DC3
413
250
155
466
284
175
522
318
196
mV
mV
mV
V
FB_DC1
V
FB_DC2
V
FB_DC3
443
270
161
466
284
175
489
298
189
mV
mV
mV
D
DG
688
725
762
mV /
V
[ Over Voltage Mute Function(OVM) ]
Over Voltage Mute
Start Voltage
Over Voltage Mute
Gain
V
OVMS
20.0
22.0
24.0
V
mV /
V
∆V
FB
= 10.0mV
∆V
FB
= V
FB
(@V
IN
= 13V) –
V
FB
(@V
IN
= V
OVM
)
∆V
FB
/
∆V
IN
V
OVMG
-
-25
-
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TSZ02201-0T1T0C700180-1-2
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