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BCR402 Datasheet(PDF) 1 Page - Infineon Technologies AG

Part No. BCR402
Description  Light Emitting Diode (LED) Driver IC Provides Constant LED Current Independent of Supply Voltage Variation
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

BCR402 Datasheet(HTML) 1 Page - Infineon Technologies AG

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AN 066 Rev D
1 / 8
16-Jan-2004
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
Package
Recommended
Current Range
Maximum
Power
Dissipation
BCR401R SOT143R 10 – 60 mA
330 mW *
BCR402R SOT143R 20 – 60 mA
330 mW *
BCR402U SC74
20 – 65 mA
500 mW **
BCR405U SC74
50 – 65 mA
500 mW **
* Soldering Point Temperature TS = 87 °C
** Soldering Point Temperature TS = 117 °C
For selecting the proper resistor value to
increase BCR402 drive current above the
nominal level of 20mA, refer to Figure 3, which


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