Detection Amplifier Simplifies Monitoring Of High-Voltage Buses And Batteries

Focus:

Many high-power electronics designs require continuous monitoring of either batteries or a high-voltage bus. Traditionally this has been done by using a divider consisting of a series string of resistors along with a differential amplifier. When using discrete resistors, designers must consider factors affecting long-term accuracy as well as the breakdown voltage rating of the resistors, and PCB creepage and clearance needs. A new IC, the BM67301FV-C, simplifies such designs by integrating a high-voltage resistor divider string with a differential amplifier and other features useful in monitoring a high- voltage bus. In this article, the authors discuss how the resistor string is designed in the conventional case. They then explain how the BM67301FV-C addresses these requirements and provide guidelines for designing voltage monitoring circuits with this IC.

What you’ll learn:

• How to simplify voltage monitoring of high-voltage batteries in EVs and industrial applications
• How to design a high-voltage resistor divider

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Author & Publication:

Mitch Van Ochten, ROHM Semiconductor, Novi, Mich. and David Doan, ROHM Semiconductor, San Jose, Calif., How2Power Today, Feb 15 2026

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