First analog-digital fusion control power supply

First analog-digital fusion control power supply

New Products |
By Jean-Pierre Joosting

ROHM has established LogiCoA™, a power supply solution for small to medium power industrial and consumer equipment (30 W to 1 kW class). It provides the same functionality as fully digital control power supplies at low power consumption and cost equivalent to analog power types.

Analog controlled power supplies are commonly used in industrial robotics and semiconductor manufacturing equipment that operate in the medium power range. However, in recent years these power supplies are also required to provide a high level of reliability and precise control that make it difficult to meet market demands with analog-only configurations. On the other hand, while fully digitally controlled power supplies enable fine control and settings, they are not widely adopted in the small to medium power range due to the high power consumption and cost of the digital controller. To address this issue, ROHM developed the LogiCoA™ power supply solution that leverages the strengths of both analog and digital technologies. High performance low power LogiCoA™ MCUs are utilized to facilitate control of a variety of power supply topologies.

The LogiCoA™ brand embodies a design philosophy of fusing digital elements to maximize the performance of analog circuits. LogiCoA™ is the industry’s first* “analog-digital fusion control” power supply that combines a digital control block centered around the LogiCoA™ MCU with analog circuitry comprised of silicon MOSFETs and other power devices.

In a fully digital control power supply, the functions handled by digital controllers such as high-speed CPUs or DSPs can be processed by low-bit MCUs, making it possible to achieve increased functionality that is difficult to realize with an analog control power supply at low power consumption and cost. The LogiCoA™ offering allows for the correction of performance variations in peripheral components according to the power supply circuit by storing various settings such as current and voltage values in the LogiCoA™ MCU. As a result, there is no need to consider design margins unlike with analog control power supplies, contributing to smaller power supplies that provide greater reliability. On top, as operation log data can be recorded in the MCU’s nonvolatile memory, it is ideal for power supplies in industrial equipment that require logging as a backup in case of malfunction.

The evaluation reference design REF66009 allows users to experience the LogiCoA™ power supply in a non-isolated buck converter circuit. Various tools necessary for evaluation are also offered, including circuit diagrams, PCB layouts, parts lists, sample software, and support documents, while actual device evaluation is possible using the optional LogiCoA001-EVK-001 evaluation board.

Going forward, ROHM will continue to develop LogiCoA™ MCUs to support various power supply topologies, contributing to achieving a sustainable society by making the power supply block (which accounts for the majority of power loss in applications) more energy efficient and compact.

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