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BCR402 반도체 회로 부품 판매점

Light Emitting Diode (LED) Driver IC Provides Constant LED Current Independent of Supply Voltage Variation



Infineon Technologies AG 로고
Infineon Technologies AG
BCR402 데이터시트, 핀배열, 회로
Applications Note No. 066
Silicon Discretes
BCR402R: Light Emitting Diode (LED) Driver IC Provides
Constant LED Current Independent of Supply Voltage Variation
Supplies stable bias current for Light Emitting Diodes (LEDs)
Low Voltage Drop of 0.75V maximizes system DC efficiency
LED drive current adjustable via single external resistor (20 – 60 mA range)
Negative temperature coefficient protects LEDs against thermal runaway
Low Cost, Low External Parts Count, Easy-to-Use, Fast Time-To-Market
Small Surface-Mount SOT143R packaging (2.9 x 1.6 x 1.1 mm inc. leads)
1. Introduction
Light-Emitting Diodes (LEDs) and LED displays
suffer from varying illumination levels as a result
of changes in power supply voltages. This is
true for displays used in automotive applications,
battery-operated handheld devices, or fixed
(architectural) installations. To keep LED
brightness constant, it is necessary to stabilize
the LED’s current over the anticipated power
supply voltage variation range.
Often a resistor in series with the LED(s) is used
to stabilize current. However, this method has
some serious drawbacks. To achieve good LED
current stability over the varying supply voltage
range, the resistor must take on a large value
(infinite resistance, in the ideal case) to make
the power supply plus series resistor
combination approach the traits of an ideal
constant current source having infinite output
impedance. In such cases, there is a large
voltage drop across this series resistor. For a
particular supply voltage, this voltage drop 1)
reduces the number of LEDs that can be driven
by one resistor, requiring additional parallel
resistors with which to drive a given number of
LEDs, thereby increasing system current
consumption and 2) power is “burned” or wasted
as heat in these series resistors.
Infineon’s LED driver family, consisting of
the BCR401R, BCR402R, BCR402U and
BCR405U, offers an easy, cost-effective and
reliable way to achieve LED current stabilization
while overcoming the drawbacks inherent in
using a series resistor. These LED driver IC’s
cover the most commonly used LED supply
current ranges – 10mA, 20mA, and 50mA.
Refer to Figures 1 and 2. In each device, the
nominal drive current may be easily adjusted
upward from the nominal value by adding a
single external resistor – for BCR401R / 402R,
connect this resistor between pins 3 and 4.
Figure 1. Infineon LED Current Driver Family
Recommended Current Ranges.
Device
BCR401R
BCR402R
Package
SOT143R
SOT143R
Recommended
Current Range
10 – 60 mA
20 – 60 mA
Maximum
Power
Dissipation
330 mW *
330 mW *
BCR402U SC74
20 – 65 mA
BCR405U SC74
50 – 65 mA
* Soldering Point Temperature TS = 87 °C
** Soldering Point Temperature TS = 117 °C
500 mW **
500 mW **
For selecting the proper resistor value to
increase BCR402 drive current above the
nominal level of 20mA, refer to Figure 3, which
AN 066 Rev D
1/ 8
16-Jan-2004


BCR402 데이터시트, 핀배열, 회로
is also found in the BCR402R datasheet. Two
cases are shown: “open”, e.g. R1 is omitted (no
R1 used), showing nominal current to be 20mA,
and R1=68, yielding 30mA. For current up to
60mA, R1 will take on values less than 68, and
R1 can be determined experimentally. Note that
in all cases,
1. BCR402R output current should be
limited to 60mA
2. Total power dissipation of BCR402R
should be limited to less than 330 mW
for device soldering point temperatures
(TS) equal to or less than 87 °C.
The power dissipation is simply calculated by
multiplying the voltage drop across the device
(e.g. voltage between pins 2 and 3) times the
device current. A good general reference for
use when determining if a given circuit design
falls within device power dissipation guidelines
may be found at [1].
Applications Note No. 066
Silicon Discretes
Figure 3. BCR402R Output Current vs.
Supply Voltage for external resistor = OPEN
and external resistor = 68.
Figure 2. Nominal Output Currents of
Devices in the Infineon LED Driver Family.
Current can be adjusted from these nominal
values via use of a single external resistor.
AN 066 Rev D
2. Application Circuit
The application circuit is designed to
demonstrate the difference between stabilizing
LED current using an Infineon LED driver IC,
versus using a series resistance to stabilize
current. This particular circuit has been
initially set up to operate over a supply
voltage range of 9V to 16V. The switch may
be used to easily toggle between BCR402R
mode and “resistor” mode. Please refer to
Figure 4.
2/ 8
16-Jan-2004




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