BCR402 Infineon Technologies Corporation, BCR402 Datasheet
BCR402
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BCR402 Summary of contents
Page 1
... 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 – range) • ...
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... BCR402R datasheet. Two cases are shown: “open”, e. omitted (no R1 used), showing nominal current to be 20mA, and R1=68Ω, yielding 30mA. For current up to 60mA, R1 will take on values less than 68Ω, and R1 can be determined experimentally. Note that in all cases, 1 ...
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... V =16V, I=29mA. When the “resistor method” used to drive the same number of LEDs as the BCR402R, more than ten times the DC power is wasted in the resistors as is burned in the BCR402R. The difference in power dissipation between the two methods, 213mW, may seem trivial, unless one considers the effect of using large numbers of such LED circuits in a large display ...
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... LEDs between the power supply voltage +V BCR402R (pin 3) such that the voltage seen at pin 3 is less than 18V. In other words, simply use additional LEDs to drop the voltage fed to the BCR402R below its maximum rating, and ...
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... Q1 and R2 are optional desired to switch LED stack on and off at this point. If switch is not needed, ground pin BCR402R. Be sure Q1 can handle voltage present at pin BCR402R given the value broad range of switching transistors suitable for Q1. ...
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... This reveals the heat sink (metal area) for the BCR402R on the backplane or bottom metal layer of the PC board. The PC board footprint was designed to fit the SOT143R package used by BCR401R and BCR402R, but it will also accommodate the SC74 package as used by the for a given BCR405U without modification. ...
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Figure 9. Top View of Application PC Board. AN 066 Rev D Applications Note No. 066 Figure 10. Close-In View of Top Metal Layer with “Heat Sink” on Backplane Silicon Discretes 16-Jan-2004 ...
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Figure 11. Enlarged Top View of PCB Showing Parts Placement Conclusions Infineon Technologies’ LED Driver family offers the end user an easy, cost-effective way to stabilize LED current in fixed, portable or automotive LED display applications. DC power ...