BL8585
WIDE RANGE, LINEAR LED DRIVER
DESCRIPTION
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 R
sense
. 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 10-
20mA. They can also be used in parallel to
provide higher current according to the bias.
This device is available in TO-92 package.
FEATURES
Wide operation range: from 5V to
90V(V
A-B
)
TO-92 packages available
I
LED
can be programmed from 10mA to
20mA via changing R
sense
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
APPLICATIONS
Industrial lamp indicators
LED driver
Accent lighting
Automotive
Constant current source
Constant current sink
TYPICAL APPLICATION CIRCUIT
PIN CONFIGURATIONS
R1
BL8585
R
sense
V
LED
{
1
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