BCR430U
Low Drop Voltage LED Driver IC
Feature list
•
•
•
•
•
Supply voltage from 6 V to 42 V
Controls up to 100 mA LED current
Typ. 135 mV saturation voltage at 50 mA
LED current precision ±5 % at 95mA
Smart over temperature protection function
Advantages with respect to discrete solutions
•
•
•
•
Low BOM count
Lower assembly cost
Smaller form factor
Higher reliability due to less parts and soldering joints
Potential Applications
•
•
•
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LED strips
LED displays and channel letters
Architectural and landscape lighting
Retail lighting
Product Validation
•
Qualified for industrial applications according to the relevant tests of JEDEC47/20/22
Package
PG-SOT23-6-1
Marking
43
Product Name
BCR430U
Description
BCR430U is a linear LED controller IC in a small PG-SOT23-6-1 package regulating the LED current in standalone
operation without any external power transistor. The IC supply voltage range is from 6 V up to 42 V. The LED
current level can be adjusted up to 100 mA connecting a high ohmic resistor Rset to pin RS. The voltage drop at
the integrated LED driver stage is less than 200 mV at 50 mA improving the overall system efficiency and
providing extra voltage headroom to compensate for tolerances of LED forward voltage or supply voltage. The
smart over temperature protection function reduces the LED current when junction temperature of BCR430U is
very high.
Datasheet
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Please read the Important Notice and Warnings at the end of this document
1.0
2017-10-09
Low Drop Voltage LED Driver IC
Table of contents
BCR430U
Table of contents
Feature list
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Advantages with respect to discrete solutions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Potential Applications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description
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Table of contents
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1
2
3
4
5
6
Application circuit
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Pin configuration
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Functional description
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Electrical characteristics and parameters
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Package dimensions
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References
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Revision history
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Disclaimer
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Datasheet
2
1.0
2017-10-09
Low Drop Voltage LED Driver IC
Application circuit
BCR430U
1
Application circuit
V
supply
I
LED
BCR430U
1
N.C.
Regulator
TSD
Band gap &
Bias generator
6
LED
2
GND
Current
generator
Driver
5
N.C.
3
R
set
RS
TSD: Thermal shutdown
4
VS
Figure 1
Typical Application Circuit of BCR430U
2
Pin
No.
1
2
3
4
5
6
Pin configuration
Pin Name Pin Type
N.C.
GND
RS
VS
N.C.
LED
-
GND
Output
Input
-
Input
Function
Not connected
IC ground & thermal connection to heat spreader on PCB
Connection of Rset resistor
Supply voltage
Not connected
Driver pin to control the LED current
N.C.
GND
RS
1
2
3
6
5
4
LED
N.C.
VS
Figure 2
Pinout BCR430
Datasheet
3
1.0
2017-10-09
Low Drop Voltage LED Driver IC
Functional description
BCR430U
3
Functional description
LED current configuration
The LED current is configured by the external resistor Rset at pin RS. The current flowing into pin LED is
proportional to the current flowing out of pin RS by a ratio of about 520:1. Therefore, the LED current depends
on the value of Rset.
100
90
80
70
I
LED
[mA]
60
50
40
30
20
6000
10000
15000
R
set
[Ohm]
20000
25000
30000
Figure 3
Relation between I
LED
and R
set
Datasheet
4
1.0
2017-10-09
Low Drop Voltage LED Driver IC
Functional description
BCR430U
Smart over temperature protection function
BCR430U reduces the LED current with increasing junction temperature by reducing the voltage at pin RS. The
reduced voltage of pin RS drives less current through the external resistor Rset, causing the current into pin LED
to reduce. The LED current is never turned off fully.
100
90
80
70
I
LED
[%]
60
50
40
30
-40
-20
0
20
40
60
T
J
[degC]
80
100
120
140
160
Figure 4
Relative reduction of LED current versus junction temperature of BCR430U
Maximum Permitted Power Dissipation
To avoid damage of the IC the power dissipation of BCR430U must be reduced with increasing ambient
temperature according to
Figure 5.
0.7
0.6
0.5
0.4
P
tot
[W]
0.3
0.2
0.1
0
0
20
40
60
80
T
A
[degC]
100
120
140
160
Figure 5
Maximum permitted total power dissipation of BCR430U on a JESD 51-7 board
Datasheet
5
1.0
2017-10-09
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