Datasheet BCR602 (Infineon) - 5

BCR602 hot plug IC with dimming Functional description 2 Functional description Typical application circuit
Cin Rpred Controller IC OR DRV VS BCR602 GND TEST VSENSE MFIO Rsense Rset DAC µC PWM U
Figure 3 Typical application circuit Application hints 1.
External driver transistors BCR602 is able to drive NPN transistors as well as NMOSFETs. NPN transistors can be used for LED currents up to several 100 mA while NMOSFETs are preferable for high LED currents. The smaller current using BJTs is caused by the DC current gain value hFE value of the used BJT. E.g. a typical hFE of 75 limits the application to a maximum below 750 mA.
2.
Supply voltage of BCR602 To drive higher output currents into an external NPN driver transistor it might be necessary to limit the supply voltage of BCR602 significantly below 60 V to reduce power dissipation inside the IC. This can be achieved either by adding a series resistor (Rpred) between supply voltage and VS pin of BCR602 or by operating BCR602 by an auxiliary winding of the power supply providing a lower IC supply voltage as e.g. 8 V or higher.
Dimming mechanism
Application MFIO input signal can be a DC voltage or a pulse width modulated digital signal for dimming of the LED current.
1.
Pure DC dimming: input voltage VMFIO at pin MFIO. Continuous dimming from 3% dimming level up to 100% is embedded into a 100% ceiling plateau and an hysteresis range to off. Static dimming to a fixed value can be done via the resistor Rset. Datasheet 5 Revision 1.1 2018-12-3 Document Outline Features Protection features Target applications Advantages with respect to discrete solutions Product validation Device information Description Table of contents 1 Pin configuration 2 Functional description 3 Thermal characteristics 4 Absolute maximum ratings 5 Operating conditions 6 Electrical characteristics 7 Package information 8 References Revision history Disclaimer