Datasheet BCR431U (Infineon) - 5

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BCR431U Low Voltage Drop LED Driver IC Functional description Smart over temperature protection function
BCR431U reduces the LED current with increasing junction temperature by reducing the voltage at pin RS. The reduced voltage of pin RS drives less current through the external resistor Rset, causing the current into pin LED to reduce. The LED current is never turned off fully. 100 75 [%] ILED 50 TJ [°C] T
Figure 4 Relative reduction of LED current versus junction temperature of BCR431U Maximum Permitted Power Dissipation
To avoid damage of the IC the power dissipation of BCR431U must be reduced with increasing ambient temperature according to
Figure 5
. 0.7 0.6 0.5 0.4 [W] totP 0.3 0.2 0.1 0 0 20 40 60 80 100 120 140 160 TA [degC]
Figure 5 Maximum permitted total power dissipation of BCR431U on a JESD 51-7 board
Datasheet 5 1.0 2020-03-03 Document Outline Features Advantages with respect to discrete solutions Potential Applications Description Table of contents 1 Application circuit 2 Pin configuration 3 Functional description 4 Electrical characteristics and parameters 5 Package dimensions 6 References Revision history Disclaimer