Riding Out Automotive Transients : Architecting Front End Power Conversion Stage for Automotive Off-Battery Loads
With rapidly expanding electronic content in latest generation of cars, there is an ever increasing need for power conversion from the car battery rail. The 12-V battery rail is subject to a variety of transients. This presents a unique challenge in terms of the power architecture for off-battery systems. This presentation introduces the different types of transients that occur in automotive battery rails, the causes of those transients, and the standards and specifications defining the test conditions for those transients.
The DS90UB953/954 System Design & Operation video series offers training for FPD-Link III devices for ADAS. FPD-Link III devices such as the DS90UB953-Q1/ DS90UB954-Q1 support sensor use over serial link for Advanced Driver Assist Systems (ADAS) in the automotive industry. In this training series, we will guide you through step-by-step procedures to initialize and bring-up the “Sensor-Serializer-Deserializer-ISP” link to an optimal performance level.
This video presents a short overview of automotive frond-end and the transients tackled by the frond-end power conversion stage connected to an automotive battery rail.
This section presents a high level overview of automotive board net and the describes the conditions that the the tests simulate. These include:
- Reverse polarity
- Jump start
- Load sump
- Starting profile
- Superimposed ac
This section presents an approach to architecting the dc-dc conversion stage to handle the transients on automotive battery rail. Following topologies are covered:
- Always-on boost + buck
- On-demand boost + buck
- Buck + post boost
Pro/cons of the different approaches are also discussed.
This section presents the different methods of protecting the electronic loads connected to the automotive battery rail in the event of accidental reverse battery connection. The methods covered include:
- Schottky diode
- PFET + discretes
- Smart diode + NFET
This section presents the buck-boost dc-dc converter as an effective and efficient solution for the wide vin automotive battery rail. The advantages compared to pre-boost and two stage solutions are presented. Also contains an overview of buck-boost converter and controller offerings convering various current and power levels.
New to mm-wave sensing? This series of five short videos provides a concise yet in-depth introduction to sensing using FMCW radars.
Labs are follow-along training videos that walk you through installation, building, and running examples of mmWave sensor projects.
This introduction video will give the background on FPD-Link III devices, such as the DS90UB953-Q1/ DS90UB954-Q1; the device's role within Advanced Driver Assist Systems (ADAS) in the automotive industry; and explain their broad appeal to engineers of all experience levels. This is fundamental to diving deeper into a 953/954 system, as well as, the links within the system.
This section frames the design and operation video series by showing why it is important to contextualize customer problems in terms of the links between the devices.
Specifically, this section will discuss: issues with initializing the camera and issues with reading the incorrect serializer ID from the deserializer.
Understanding what hardware and software settings are important is critical to establishing a foundation for the 953/954 system. These settings can occur during or after power up and may need to be changed via software. As a result, these settings are routinely checked and verified before checking any of the other links in the system.
Specifically, this sections discusses: Diagnostics post power up, Mode and IDX Pins, Clocking Modes between the 953/954, Aliasing, I2C Pass Through, Port selection on 954, Analog Launch Pad (ALP), and Successful I2C Communication
This section analyzes the link between the 953 and 954 and establishes how to identify the health and operation of the link. Since the link between the 953-954 is the most fundamental link used to communicate between devices, it is often checked first.
Specifically, this section discusses: Back Channel configuration, Built in Self Test (BIST), Adaptive Equalization (AEQ), and Channel Monitor Loop (CMLOUT)
This section discusses what frame synchronization (FrameSync) is and how to configure in on the 953 and 954 and how CSI2 data is transferred across the link from the 954 to the ISP/SoC
Specifically, this section discusses: Frame Synchronization (FrameSync), Controlling 953 GPIOs locally and remotely via I2C, Unsynchronized and synchronized sensors, Internal and External Frame Sync, Port Forwarding, Accessing Indirect Registers, and Pattern Generation on 953 & 954
This section discusses how design a 953/954 using Power over Coax (PoC), and various hardware checks and concepts that need to be considered when analyzing a 953/954 system.
Specifically, this section discusses: Power Over Coax (PoC), AC Coupling Capacitors, PoC Inductors, Typical PoC Schematic, Critical Signal Routing, I2C Pullups, Loop Filter Capacitors on 953, Insertion Loss, Return Loss, and Time Domain Reflection (TDR) measurements.