Triple 60mA Linear LED Controller
Preliminary Information - Jan 21, 2015
E522.84/85/86/87
5.7 Exemplary Application Topologies
This chapter provides various exemplary Application topologies and use-cases for E522.84/85/86/87. 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.
5.7.1 Basic Application Topology
RUN
VS
LED1
LED2
LED3
IR
GND
ENA
E522.84
Figure 7. Basic Topology
This is an exemplary basic implementation using E522.84/85/86/87 Family members. The basic features are
Permanent operation of all LED strings
Common current configuration for all LED strings by single resistor
Channels diagnostics are always active, switching all Outputs in common ‘on’ or ‘off’
Capacitors at the LED loads are used to improve PSRR of the circuit
5.7.2 Six Channel Cluster and Supply-Dimming
RUN
VS
LED1
LED2
LED3
IR
GND
ENA
E522.84
E522.84
RUN
VS
LED1
LED2
LED3
IR
GND
ENA
Figure 8. Six Channel Cluster
This Application is a six-channel cluster, that makes use of the following product features:
- Digital Dimming via supply line is possible. ICs remain powered by reverse polarity protection and input capacitors,
consuming only very low sleep mode currents during supply low phase
- RUN connection is used to propagate a potential failure information between ICs, imitating the behaviour of a bulb if
necessary (either all ‘on’ or all ‘off’)
- Capacitors at LEDs are not drawn, but can improve e.g. power supply rejection ratio or ESD behaviour
This document contains information on a pre-production product. Elmos Semiconductor AG reserves the right to change specifications and information herein without notice.
Elmos Semiconductor AG
Data Sheet
QM-No.: 25DS0137E.00
14/20
ELMOS [ ELMOS SEMICONDUCTOR AG ]
