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BCR402R Datasheet(PDF) 6 Page - Infineon Technologies AG

Part # BCR402R
Description  LED Driver
Download  8 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

BCR402R Datasheet(HTML) 6 Page - Infineon Technologies AG

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2009-11-13
6
BCR402R
Application Circuit:
supply voltages >18V
Standard Application Circuit:
BCR 402R
Vdrop
Rext
3
4
2
1
+Vs
Is
Iout
Rsense
(optional)
Vsupply
BCR401R
BCR402R
LEDs
Vs
GND
Rext
Iout
LEDs
IOUT
IOUT + IDRIVER
IDRIVER
Application hints
BCR402R serves as an easy to use constant current source for LEDs. In stand alone
application an external resistor can be connected to adjust the current from 20 mA to 60 mA.
Rext can be determined by using the diagram 'Output current versus external resistor',
or by refering to diagram 'Output current versus reference voltage'. Look for your desired
output current on the y axis and read out the corresponding Vdrop. Calculate Rext:
Rext = Vdrop / (Iout -(Vdrop/Rint))
Please take into account that the resulting output currents will be slightly lower due to the
self heating of the component and the negative thermal coefficient.
Please visit our web site for application notes: www.infineon.com/lowcostleddriver
• AN066 explains the basic concept
• AN077 gives hints to thermal design


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