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BCR402R Datasheet(PDF) 6 Page - Infineon Technologies AG |
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BCR402R Datasheet(HTML) 6 Page - Infineon Technologies AG |
6 / 8 page 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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