BELLING BL8585

BL8585
WIDE RANGE, LINEAR LED DRIVER
DESCRIPTION
FEATURES

The BL8585 is a high-voltage adjustable
current source with accurate temperature
compensation. The device is designed to
provide a constant current source determined
by an external sense resistor Rsense. The
current is adjustable from 10mA to 20mA
with less than 10% error while input changes
from 5V to 90V. With an external resistor (R1
in Figure 1) between VA and IS pin, the heat
in the IC can be significantly reduced while
keeping the summation of IC and R1 current
to be constant. This is extremely useful in the
area that power lines are not very stable. A
typical application for the BL8585 is to drive
LEDs with a constant current varies from 1020mA. They can also be used in parallel to
provide higher current according to the bias.
This device is available in TO-92 package.
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APPLICATIONS

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Industrial lamp indicators
LED driver
Accent lighting
Automotive
Constant current source
Constant current sink
PIN CONFIGURATIONS
TYPICAL APPLICATION CIRCUIT
R1
BL8585
Rsense
{
VLED
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Wide operation range: from 5V to
90V(VA-B)
TO-92 packages available
ILED can be programmed from 10mA to
20mA via changing Rsense
Power dissipation can be adjusted
Easy to use, only 3 pins and very little
external components are needed
Can be paralleled for higher current
Temperature compensated
1
BL8585
MARKING INFORMATION
ORDERING INFORMATION
BL8585 □
1 □
2 □
3
Marking information
Marking
Description
Code
Description
Temperature & Rohs:
C: -40~85C,Pb Free Rohs Std.
Package type:
H: TO-92
Packing type:
PT: Paper type
BG: Bag (TO-92)
8585
Product code
1
□
8585
YY
Lot NO.
2
□
YYBZZ
B
FAB code
ZZ
Date code
3
□
ABSOLUTE MAXIMUM RATING
Name
Max Supply Voltage
Thermal resistance
Maximum Junction temperature
Storage temperature
Symbol
VA-B
Value
90
170
150
-55 to150
ΘJA
TJ
Tst
Unit
V
℃/W
℃
℃
ELECTRICAL CHARACTERISTICS
Symbol
Item
Conditions
Min
VA-B
Operating Input Voltage
N/A
IA-B
Current regulation
VA-B=5-90V,
ISET=20mA
VIS
Current sense voltage
TJ
Operating junction
temperature
Max
Unit
5
90
V
-10
+10
%
0.6
-45
BLOCK DIOGRAM
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Typ
2
V
125
℃
BL8585
OPERATION
The BL8585 is a high voltage integrated
constant current driver. It can operate in a
wide range from 5V to 90V, and the output
current can be programmed just by change the
sense resistor. This module provides a precise
regulated output current, the typical
application is showed in figure 1.
When the ambient temperature is fixed, from
thermal resistance value, the maximum power
dissipation of the IC can be calculated. Say
the maximum allowed temperature increase is
50C, with TO-92 package (170C/W thermal
resistance), the maximum allowed power
dissipation is 0.29W. Assume the maximum
VA-B is 50V, Iset = 20mA, and Vsense = 0.6V.
Then
P
R1  (VA B  Vsense ) /( I SET  D )  3.5k
V A B
R1’s power requirement can be calculated by
2
V
PR1  A B  0.71W
R1
Rsense can be calculated from sense voltage
and current set:
V
Rsense  IS  30
I SET
As the BL8585 is a linear power supply, with
high input voltage, the power dissipation
should be considered. For example, if the set
current is 20mA, when the VA-B is 5V, the
module dissipation
PD  VA B  I SET  PD  0.1W
If the VA-B is 90V, the power dissipation is as
high as 1.8W. An external resistor R1 can be
added to reduce the power dissipation of the
BL8585. Then the power dissipation on the
IC becomes
V  VSense
PD  V A B  ( I SET  A B
)
R1
ISET
R1
VA
LC1920
BL8585
Is
VB
UP to 90V+VLED
…
Figure1: Typical application circuit
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3
Rsense
BL8585
PERFORMANCE CHARACTERISTICS
(All the test done at ISET=20mA)
Output current VS VA-B
VA-B VS Output Current
25
IA-B(mA)
20
15
10
5
0
0
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
VA-B(V)
Temperature characteristics
IA-B VS Temperature
21.5
VA-B=6V
VA-B=45V
IA-B (mA)
21.0
20.5
20.0
19.5
19.0
-50
-25
0
25
50
Temp(℃)
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4
75
100
125
BL8585
APPLICATION CIRCUITS
VA
VA
Is
BL8585
LC1920
VA
LC1920
BL8585
VB
Is
Is
BL8585
LC1920
VB
VB
UP to 90V+VLED
…
VA
Is
Is
Figure2: For large current use
LC1920
BL8585
VB
LC1920
BL8585
VA
VB
UP to 180V+VLED
…
Figure3: For high input voltage use
VA
VA
BL8585
LC1920
Is
VA
BL8585
LC1920
VB
Is
BL8585
LC1920
VB
VB
UP to 90V+VLED
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5
…
…
…
Figure4: For multiple LED strings use
Is
BL8585
PACKAGE INFORMATION
Package
TO-92
Devices per reel
Package dimension：
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6
3000Pcs
Unit
mm