A Guide To Power Electronics Design For Off-Battery Automotive (Part 2): DC-DC Conversion From 12 V

Focus:

In this second installment, the author presents a voltage regulator design that demonstrates how the immunity requirements explained in part 1 can be met in practice and verified. By way of example, the author delves into an implementation that powers an electronic control module (ECU) with a maximum load current of 15 A. Operating from a 12-V battery and based on the LM25141-Q1 synchronous buck controller, the regulator design uses 40-V silicon MOSFETs at a switching frequency of 2.1 MHz to reduce passive component size and avoid operating in the AM radio band. A front-end circuit that includes a reverse- battery protection (RBP) controller (based on the LM74722-Q1 ideal diode controller) enables the system to meet the transient immunity requirements described in detail in part 1, including compliance tests specified in ISO 16750-2, ISO 7637-2 and LV 124.

What you’ll learn:

• How to design a voltage regulator for embedded 12-V input automotive applications
• How to meet transient immunity requirements in an automotive voltage regulator design using a reverse battery protection controller

View the Source

Author & Publication:

Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Jun 15 2022

This article summary appears
in the HOW2POWER Design Guide.

The Design Guide offers
organized access to
hundreds of articles
on dozens of power conversion
and power management topics.

The Design Guide search results
include exclusive summaries
and accurate "how to" analysis
to help you make faster,
more informed decisions.

Search
for more articles