Monolithic Power Systems, Inc. · NASDAQ:MPWR
Monolithic Power Systems — Technical Presentation (January 2023)
16 slides from Monolithic Power Systems's technical presentation, January 2023
Slide 1: Designing Cooler Running, Multi-Channel Dynamic Automotive Lights
Designing Cooler Running, Multi- Channel Dynamic Automotive Lights Key points to help you choose the best LED Driver January 2023
Slide 2: Agenda
Agenda Introduction Understanding the Matrix LED System Selecting the Right Topology Challenges for Rear Light Designs Selecting the LED Driver Thermal issues EMC issues Our Tail Lamp Design Conclusions
Slide 3: Introduction
Introduction Interior Exterior Rear Exterior Front Halogen Lamp HID Systems LED Systems • Cost efficiency • Better lighting performance • Longer life span • Ease of service • Less energy consumption • More efficient
Slide 4: Understanding the Matrix LED System
Understanding the Matrix LED System • Each LED of the matrix is controlled independently to create innovative and fascinating light designs: • Improve driver’s visibility • Adjust light beam to the environment • Opens new communication channel with other road users
Slide 5: Selecting the Right Topology
Selecting the Right Topology Headlight with Matrix Dimming • High Voltage • Low Current Car Reverse Battery Boost LED Battery Protection Driver Matrix Dimmer
Slide 6: Selecting the Right Topology
Selecting the Right Topology Rear Light with Dynamic Effect • Low Voltage • High Current Car Reverse Battery Buck Battery Protection Regulator Multi-Channel Linear LED Driver
Slide 7: Challenges for Rear Lights Design
Challenges for Rear Lights Design 1. PCB size • Lighting systems must be integrated inside car => PCB size is limited • Reduce number of components without losing LED controllability 2. Scalability • Long rear light designs are commonly built joining smaller modules • Easy connection between modules
Slide 8: Challenges for Rear Lights Design
Challenges for Rear Lights Design 4. Protection • When working with LED matrices it is important to sense malfunctions inside the system • Detecting over-temperatures, SC or OC is vital to extend lifetime of the system VIN VIN VIN 5. Communication • LED Driver configuration must be easily accessible
Slide 9: Selecting the LED Driver
Selecting the LED Driver Ease of Scalability • High number of Channels per LED Driver • High number of programmable device addresses Challenge Solutions • Pin-programmable device address PCB Size Scalability • Single I/O Pin for Daisy Chaining Brightness Protection Communication Class Leading Bright
Slide 10: Selecting the LED Driver
Selecting the LED Driver Safety Oriented • Assist system design to achieve a functional safety grade of ASIL-B Challenge MPQ7225 • Protection suite includes thermal warning, LED PCB Size open/short, PIN open/short Scalability • Fail safe pin and fault registers for system protection Brightness and d
Slide 11: Thermal Issues
Thermal Issues Adaptive Feedback Control (AFC) • Optimization of system efficiency • Dynamically adjust the output voltage of DC/DC converters in respect to the characteristics of the LEDs
Slide 12: Thermal Issues
Thermal Issues Adaptive Feedback Control (AFC) No AFC AFC Test Condition: 2LEDs, ILED=200mA/CH, All 16 CH on, 4 layers, 2oz AFC adjust the VBIAS, VLEDX Boundary [0.3V, 0.4V] Fix VBIAS=7V, VLEDx=1.07V
Slide 13: EMC Issues
EMC Issues • When designing system for automotive sector, it is a must to follow the EMC constraints Possible Solutions 1. Programmable Slew Rate and Phase Shift 2. Frequency spread spectrum (internal clock) 3. Selectable Frequency in PWM Dimming
Slide 14: Our Tail Lamp Design
Our Tail Lamp Design Car Buck • 84 LEDs 3.5V Battery Regulator x84 • 30 columns • 3 rows MPQ7225 x 6 • 6 LED Drivers: MPQ7225 • Each LED is controlled independently • LED PCB: • 80mm x 110mm • 2 layers • The system includes a 36V, 20A buck converter to power LEDs and LED Drivers
Slide 15: Conclusions
Conclusions • Great Scalability • Class Leading Brightness • Safety Oriented Design • Robust Communication • EMIs reduction techniques • Excellent Thermal Performance • MPQ7225 is one of the best options to design Multi-Channel Dynamic Automotive Lights
Slide 16: Q&A
Q&A Let us know your questions
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