Elmos Semiconductor Se · XETR:ELG
Elmos Semiconductor — Technical Presentation (2015)
31 slides from Elmos Semiconductor's technical presentation, 2015
Slide 1: Product Introduction of Triple Linear LED Controller Family E522.80/84 for Automotive
Product Introduction of Triple Linear LED Controller Family E522.80/84 for Automotive Copyright © 2015 Elmos Semiconductor AG. All rights reserved. Confidential No redistribution without prior admission.
Slide 2: Elmos 522.8x Linear LED Controller Family
Elmos 522.8x Linear LED Controller Family Evolutionary Introduction to Product Features E522.8x Linear LED Controller Family Excerpts of Features in the Datasheet Source: Elmos 2
Slide 3: Starting Point: Classical Linear LED Control Topology
Starting Point: Classical Linear LED Control Topology e.g. for Rearlight Modules Rearlamp Module Control Module Topology based on Discretes only A master Driver modulates a PWM signal to via a single supply line Properties of this implementation are Weak diagnostic features (only total current
Slide 4: Starting Point: Classical Linear LED Control Topology (ICs)
Starting Point: Classical Linear LED Control Topology e.g. for Rearlight Modules Rearlamp Module Control Module Topology based on ICs driving LEDs Compatible interface to the discrete solution Improvements over the discrete-built solution Diagnostics within rearlamp module are possible Curre
Slide 5: Starting Point: Classical Rearlight Module Topology
Starting Point: Classical Rearlight Module Topology Exemplary Integrated IC Solution Parallel ICs operate one or more channels of LEDs in parallel Usually 2 or 3 LEDs are operated per channel to survive typ. battery drop transients General requirements include operation <150mA, open-detection,
Slide 6: Starting Point: Puzzle Pieces for Evolution of IC Properties
Starting Point: Puzzle Pieces for Evolution of IC Properties 2 1 3 4 Puzzle Pieces 1: How to handle linear power-dissipation? 2: If using a power-shunt, how to provide full current for low supply voltages? 3: Lowside feedback: How can a GND shift (e.g. at connectors) be handled? 4: If diagno
Slide 7: Piece 1: Internal Power Dissipation of the Driver
Piece 1: Internal Power Dissipation of the Driver ? Question: High Linear Power Dissipation, what can be done? The linear power in the ICs is directly proportional the to supply voltage A typical exposed die pad package assembly may provide RTH,J-A of 15...30K/W At VVS supply of 14V and VLED=
Slide 8: Piece 1: Internal Power Dissipation of the Driver
Piece 1: Internal Power Dissipation of the Driver ! Answer: Power can be shared with external Power-Sinks Export power to some external heat-dissipating element, e.g. a resistor Power up to ILED2 * REXT can be dissipated in the external element But if handled in this way, …. Source: Elmos 8
Slide 9: Piece 2: Low-Voltage Operation
Piece 2: Low-Voltage Operation ? Question: How is Undervoltage Behaviour affected? …. low-voltage performance degrades, because the current becomes limited by the resistor REXT in case of cranking pulses etc. How can the under-voltage performance of the linear-regulator be re-covered? Which wa
Slide 10: Piece 2: Low-Voltage Operation
Piece 2: Low-Voltage Operation ! Answer: A redundant Output Path is provided Provide a parallel, redundant path for the current flow in case the current cannot be delivered by the primary output! The current can be kept fully controlled down to the VLED forward-voltage … and the thermal perfor
Slide 11: Piece 1+2: E522.8x High-Power Handling
Piece 1+2: E522.8x High-Power Handling Power Distribution Principle in E522.80/81/82/83 Applications Power as a function of V ( VS ) Exemplary for V ( LED ) = 6V and different ext. Shunts ( Single-Channel Calculation, 120mA ) 2,00 PLED 1,60 P(R1=33Ohm) P(E522.8x)@R1 P(R2=56Ohm) 1,20 P(E522.8x)@R2 P
Slide 12: Piece 1+2: Power Sharing, Zoom and Math
2,00 Piece 1+2: Power Sharing, Zoom and Math 1,60 PLED P(R3=82Ohm) 1,20 P(E522.8x)@R3 P [W] PR,EXT PLED 0,80 0,40 „Zero Power #2“ P522.8x → If VVS fulfills the condition 0,00 5,0 10,0 15,0 20,0 25,0 VVS =30,0 VFW,LED + ILED * REXT the power across the driver is V (VS) [ V ] again theoretically „zero
Slide 13: Piece 1+2: E522.8x High-Power Handling
Piece 1+2: E522.8x High-Power Handling VREF VREF,NOM dVJ,DERATE Nom. Operating Range for external VREF = VENA /2 Limited VENA,ON /2 by abs. 522.8x disabled by ENA max. Ratings -40°C 150°C TJ TJ,DERATE TJ,OT Internal Derating of Reference „regulates“ Junction Temperature Internal derating function
Slide 14: Piece 1+2: E522.8x High-Power Handling
Piece 1+2: E522.8x High-Power Handling VREF VREF,NOM dVJ,DERATE VIN Overvoltage Reference Derating 0.6 * VREF,NOM Over-Voltage Operating Range for external VREF = VENA /2 Limited VENA,ON /2 by abs. 522.8x disabled by ENA max. Ratings -40°C 150°C TJ TJ,DERATE TJ,OT Internal Derating of Reference decr
Slide 15: System Design: Open Detection Concepts
System Design: “Open Detection” Concepts based on either relative Voltage or Current? Issue : Relative Voltage System : ILED Simple and intuitive implementation approach, usually relative to the supply voltage ISPAN,VOLT Drawback: Usually IC vendors do not specify the remaining current flow at t
Slide 16: Piece 3: Current Configuration and Feedback
Piece 3: Current Configuration and Feedback ? Question: What Ground Potential Difference can be handled? Is „cathode-to-GND“ Topology possible? For e.g. the use of connectors or even wiring to connect LEDs within rearlamp a feedback can be critical regarding GND potential differences between drive
Slide 17: Piece 3: Current Configuration and Feedback
Piece 3: Current Configuration and Feedback ! Answer: GND at LEDs as reference potential is not required, and „cathode-to-GND“ Topology is possible The configuration can be made via a single, low-power resistor connected to the controlling IC. The current source becomes a true current source Cat
Slide 18: Piece 4: Behavior of a Single Bulb in case of Failures
Piece 4: Behavior of a Single Bulb in case of Failures ? Question: How can the Fault-Behavior of a Bulb be immitated by a LED Cluster? Failure information must be distributed between ICs Restart mechanisms must be available to avoid deadlock situation Important: Glowing or glimming of LEDs mus
Slide 19: Piece 4: Behaviour of a Single Bulb in case of Failures
Piece 4: Behaviour of a Single Bulb in case of Failures ? Question: How many Components are necessary? There are solutions on the market, that may require 20...30 external discretes. LEDs are potentially glowing due to lack of option to store failure information Source: Elmos 19
Slide 20: Piece 4: Behaviour of a Single Bulb in case of Failures
Piece 4: Behaviour of a Single Bulb in case of Failures ! Answer: No external Components are required for “Single Bulb!“ A private bus connects all ICs, distributing the information of a failure on a channel All ICs enter low-power standby mode, allowing the control module to diagnose via curren
Slide 21: Piece 4: Statediagram Excerpt from Datasheet
Piece 4: Statediagram Excerpt from Datasheet Global, Prio 1: VVS < VVS,ERR VS RESET Global, Prio 2: Thermal Junction Over- Two ways to handle Fault- Global, Prio 3: RUN active low Temperature Shutdown if all [ y ] are statically SLM set to pulldown LED Outputs pulldown RUN active low disabled for 64
Slide 22: Before and After Comparison of Topologies
Before and After Comparison of Topologies 2 1 ? 3 Starting Toplogy 4 ? 2 1 3 4 Source: Elmos 22
Slide 23: E522.80 Product Family Features
E522.80 Product Family Features Features of E522.80 / 81 / 82 / 83 Three independent Linear Current Drivers ( 3*150mA ), allowing parallel Output Operation for up to 450mA Independent Thermal Management Option per Channel Operating Input Voltage Range 5V to 25V, max. 40V and Low Power Standby
Slide 24: E522.80 Product Family Features
E522.80 Product Family Features What´s the family members Difference? Family Members provide different VVS levels of VVS,DIAG to adapt to the level of voltage VLED,MAX that is needed to operate the LEDs Nominal System Operation - Full Diagnostic - Full LED current available Product Version Typ. VV
Slide 25: E522.81 Automotive Cluster Example
E522.81 Automotive Cluster Example E522.81 RUN LED1B VS LED1A GND LED2B ENA LED2A IR1 LED3B 1 IR2 LED3A IR3 SLM 2 E522.81 3 RUN LED1B VS LED1A 5 GND LED2B ENA LED2A IR1 LED3B IR2 LED3A 4 IR3 SLM Source: Elmos 25
Slide 26: E522.81 Automotive Cluster Example
E522.81 Automotive Cluster Example E522.81 RUN LED1B Cloud 1: VS LED1A GND LED2B ENA LED2A Power Supply Dimming is 1 IR1 LED3B possible. The Resistive divider can be used for IR2 LED3A IR3 SLM analog low-voltage current 2 derating … E522.81 3 RUN LED1B or to define an undervoltage VS LED1A 5 thr
Slide 27: E522.81 Designers Reference Generation Options
E522.81 Designers Reference Generation Options ENA Current Configuration + ENABLE Different Mechanisms define the 1.2V - voltage that is applied to the VREF,NOM VREF,HV current configuration resistor VS Overvoltage Channel The internal amplifier accepts the 250kW Current Reference lowest referen
Slide 28: E522.81 Automotive Cluster Example
E522.81 Automotive Cluster Example Cloud 3: E522.81 RUN LED1B VS LED1A GND LED2B Ceramic type inductive supply ENA IR1 LED2A LED3B handling / damping proposal 1 IR2 LED3A IR3 SLM 2 Cloud 4: E522.81 3 RUN LED1B Simple permanent disable VS LED1A 5 option if less than 3 GND ENA LED2B LED2A channels
Slide 29: E522.8x Product Family Extension
E522.8x Product Family Extension Features of E522.84 / 85 / 86 / 87 Extension IC for System-designers to driver smaller Currents per channel Three independent Linear Current Drivers ( 3*60mA ), allowing parallel Output Operation for up to 180mA Low-RTH SO8EP Package for cost-optimized integrat
Slide 30: E522.8x Product Family Extension II
E522.8x Product Family Extension II Outlook Interested in lower currents, but need the full feature set of E522.80 ? Like to discuss your system-concept with product-experts ? Get in contact with Elmos – we support your ideas ! Datasheets are available on www.elmos.com/..... Source: Elmos 30
Slide 31: Elmos Semiconductor AG
Disclaimer / all material shown is based on assumptions and actual views of Elmos Semiconductor AG and may be adapted without further notice, depending on market situation or technical requirements as necessary, up to discontinuation of products presented herein. Schematics or drawings do not imply