Datasheet E522.80, E522.81, E522.82, E522.83 (Elmos) - 17

Triple 150mA Linear LED Controller E522.80/81/82/83 Production Data - May 5, 2017 5.8 Exemplary Application Topologies This chapter provides various exemplary Application topologies and use-cases for E522.80/81/82/83. From basic setup to full automotive setup there are typical options given, which of course can be combined to more complex systems. Please make sure, that examples taken from this chapter fulfil your application requirements. 5.8.1 Basic Application Topology RUN LED1B VS LED1A GND LED2B ENA LED2A IR1 LED3B E522.80 IR2 LED3A IR3 SLM Figure 11. Basic Topology This is an exemplary basic implementation using E522.80/81/82/83 Family members. The basic features are - Permanent operation of all LED strings - Individual current configuration for each LED String - Channels diagnostic does not interfere between channels (FFM mode used - see SLM pin and RUN pin open) - Capacitors at the LED loads are used to improve PSRR of the circuit 5.8.2 Basic µC RGB Setup RUN LED1B VS LED1A GND LED2B ENA LED2A IR1 LED3B E522.80 IR2 LED3A IR3 SLM External µC Figure 12. RGB µC Topology RGB driving is possible using the individual current configuration per channel of the LEDs via IR. An additional µController drives the resistors to GND (enable of channel) or to its supply (disable of channel). - External controller provides colour mixtures by dimming at either IR1,2,3 or ENA - Optionally, instead of digital signals, an analog reference can be generated by the controllers DAC to the ENA pin (with respect to the input impedance of ENA) - Diagnostic feedback is provided from SLM by failure-feedback mode, indicating potential issues for a channel via PWM signal. In this way e.g. redundancy can be build for the colours, compensating a single channel fail with another LED string Hint: Make sure, that the voltage drop across the controller ports is low to make sure, that reference current remains accurate. Elmos Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products. Elmos Semiconductor AG Data Sheet QM-No.: 25DS0132E.03 17/25