A Guide To Power Electronics Design For Off-Battery Automotive (Part 2): DC-DC Conversion From 12 V
by Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Jun 15 2022
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
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