Datasheet
Constant Current LED Drivers
50V 500mA
1ch Source Driver for Automotive
BD83732HFP-M /BD83733HFP-M
General Description
BD83732HFP-M and BD83733HFP-M are 50V tolerant
LED current drivers. Suitable for Automotive LED
applications, it can control light through constant current
output with control using PWM.
Having LED open/short detective circuit and LED current
de-rating functions integrated, it can deliver high reliability.
By utilizing Rohm’s patented PBUS function, it is possible
to turn OFF all LEDs when a row of LEDs are
short/open-circuited if multiple number of the ICs are used
In case the LED connected to the output IOUT terminal
has 2 LEDs in serise, BD83732HFP-M has to be used, in
case of 3 LEDs in series - BD83733HFP-M ( Refer to
Page.18 LED Open Detection / Disable LED Open
Detection ).
Key Specifications
Input Voltage Range: 4.5V to 42V
Max Output Current: 500mA (Max)
Output Current Accuracy: ±5% (Max)
Operating Temperature Range: -40°C to +125°C
Packages
HRP7
W(Typ) x D(Typ) x H(Max)
9.395mm x 10.540mm x 2.005mm
Features
AEC-Q100 Qualified
Variable form Constant-Current Source Driver
PWM Dimming Function
LED constant current set by external resistor
LED Current De-rating Function
LED Open/Short detection
Disable LED Open Detection at low power supply
Temperature Protective
Abnormal Output Detection and Output Functions
(PBUS)
HRP7
Application
On-board Exterior Lamp
(Rear Lamp, Turn Lamp, DRL/Position Lamp,
Fog Lamp, etc.)
On-board Interior Lamp
(Air Conditioner Lamp, Interior Lamp,
Cluster Light, etc.)
Basic Application Circuit
Figure 1. Typical Application Circuit
○Product
configuration: Silicon monolithic integrated circuit
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BD83732HFP-M / BD83733HFP-M
Pin Configurations
(TOP VIEW)
Datasheet
FIN(GND)
1
PBUS
2
DISC
3
CRT
4
GND
5
IOUT
6
VIN_F
7
VIN
Figure 2. HRP7 Package Pin Configuration
Pin Descriptions
HRP7 Package
Pin No.
1
2
3
4
5
6
7
If not used DISC should be shorted to GND.
Pin Name
PBUS
DISC
CRT
GND
IOUT
VIN_F
VIN
Function
Error detection I/O, LED current de-rating input terminal
Discharge setting pin
Capacitor Resistor Timer setting
GND
Current output
Output current detection
Power supply input
Block Diagram
Figure 3. Block Diagram
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BD83732HFP-M / BD83733HFP-M
Absolute Maximum Ratings
(Ta=25°C)
Parameter
Supply Voltage
VIN_F,CRT,DISC,IOUT,PBUS
Terminal Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Junction Temperature
IOUT Output Maximum Current
(Note1)
Datasheet
Symbol
V
IN
V
VIN_F
,V
CRT
,V
DISC
,V
IOUT
,V
PBUS
Pd
Topr
Tstg
Tjmax
I
OUT
Rating
-0.3½+50
-0.3½VIN
2.29
(Note1)
-40½125
-55½150
150
500
Unit
V
V
W
°C
°C
°C
mA
HRP7
De-rate by 18.4mW/°C when operating above Ta=25°C
Please refer to page 21 below.
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
Parameter
Supply Voltage
(Note1)
Operating Temperature Range
CRTIMER Frequency Range
PWM Minimum Pulse Width
(Note1)
Pd, ASO should not be exceeded
Symbol
V
IN
Topr
F
PWM
T
MIN
Rating
4.5½42.0
-40½125
100½5000
10
Unit
V
°C
Hz
µs
Operating Conditions
Parameter
Current Setting Resistor
Capacitor
connecting VIN terminal
Capacitor
connecting IOUT terminal
Capacitor
connecting CRT terminal
DC_IN pull-down resistor
Symbol
R
VIN_F
C
vin
C
IOUT
C
CRT
R
DCIN
Min
0.36
1.0
0.1
0.01
-
Max
3.6
-
0.66
1.0
50
Unit
Ω
μF
μF
μF
kΩ
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BD83732HFP-M / BD83733HFP-M
Datasheet
Electrical Characteristics
(Unless otherwise specified Ta=-40½125°C, V
IN
= 13V, R
VIN_F
=0.47Ω, R
PBUS
=10kΩ)
Parameter
Circuit Current
IOUT Terminal
Output Current Accuracy
VIN – IOUT Drop Voltage
IOUT Terminal OFF Current
IOUT Current at GND Short
Current Sense Voltage
IOUT Voltage
at LED Open Detection
IOUT Voltage
at LED Short Detection
CRT Terminal Charge Current
CRT Terminal Voltage
CRT Terminal
Discharge Voltage 1
CRTIMER Discharge Constant
CRT Terminal
Discharge Voltage 2
CRT Terminal
Charge Resistance
DISC Terminal
Discharge Resistance 1
DISC Terminal
Discharge Resistance 2
PBUS Terminal De-rating Input
Voltage High
PBUS Terminal De-rating Input
Voltage Low
De-rating Gain
PBUS Terminal
Low Voltage
PBUS Terminal
Input Current
Disable Open Detection
during low power supply voltage
BD83732HFP-M
BD83733HFP-M
Symbol
I
VIN
Min
-
373
I
OUT
364
V
DR_IOUT
I
IOUT_OFF
I
IOUT_SHORT
V
IN_F_REF
V
IOUT_OPEN
V
IOUT_
SHORT
Typ
2.1
383
383
0.45
-
7
0.180
V
IN
-0.050
0.6
35.00
1.10
3.0
0.367
4.0
54.3
50.0
5.0
Max
6.0
393
402
1.0
1
40
0.189
V
IN
-0.020
1.0
40.25
1.21
3.3
0.386
4.4
57.0
100
10
UNIT
mA
mA
mA
V
μA
μA
V
V
V
μA
V
V
V/V
V
kΩ
Ω
kΩ
Ta=25°C
Condition
Ta=-40°C½125°C
I
OUT
=383mA
V
IOUT
=2V, V
CRT
=0.7V
Ta=25°C
V
IOUT
=0V
V
IN_F_REF
=V
IN
-V
IN_F
-
-
-
0.171
V
IN
-0.080
0.2
29.75
0.990
2.7
0.348
3.6
51.6
-
2.5
I
CRT_SO
V
CRT_CHA
V
CRT_DIS1
V
CRT_CHA /
V
CRT_DIS1
V
CRT_DIS2
R
CHA
R
D1
R
D2
V
CRT
=0.9V
R
D1<->
R
D2
(Note1)
R
CHA
=(V
CRT_DIS1
－
V
CRT_CHA
) / I
CRT_SO
V
CRT
=3.4V
V
CRT
=5V
⊿V
IN_F_REF
= 2.0mV
⊿V
IN_F_REF
=
V
IN_F_REF(@PBUS = 13V) –
V
IN_F_REF(@PBUS = VDH_PBUS)
I
OUT
<5µA
⊿I
OUT
=G
D
×V
PBUS
V
PBUS
=1.5V -> 2.0V
I
PBUS
=2mA
V
PBUS
=13V
V
DH_PBUS
2.3
2.5
2.7
V
V
DL_PBUS
G
D
V
OL_PBUS
I
IN_PBUS
0.8
114
-
-
1.0
120
-
38.0
1.2
126
0.7
100
V
mV/V
V
μA
V
M_OPEN
V
M_OPEN
7.30
10.5
7.65
11.0
8.00
11.5
V
V
VIN voltage
VIN voltage
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TSZ02201-0G1G0C700310-1-2
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BD83732HFP-M / BD83733HFP-M
●Typical
Performance Curves (Reference Data)
(Unless otherwise specified Ta=25°C, V
IN
=13V, R
CRT
=3.9Ω, C
CRT
=0.033μF, C
IOUT
=0.1μF )
Datasheet
ΔI
OUT
=(I
OUT
/(0.18V/R
VIN_F
)-1)×100[%]
Figure 4. R
VIN_F
vs I
OUT
Figure 5. R
VIN_F
vs
ΔI
OUT
Figure 6.Temperature vs V
IN_F_REF
Figure 7. PBUS vs V
IN_F_REF
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