Power Supply Unit (PSU)
The rise of generative AI and advances in cloud computing have required data centers to have unprecedented computing power. Supporting the rapidly increasing power consumption and heat generation of AI servers, and adapting to new power supply architectures such as high-voltage direct-current (HVDC) power distribution— The key to solving these challenges lies in a dramatic technical innovation in power supply units (PSUs).
In particular, an extreme efficiency exceeding 80 PLUS® Titanium, as well as downsizing and higher power density to accommodate PSUs in increasingly dense server racks, can now be considered essential requirements. The key to overcoming this high hurdle is SiC (silicon carbide) and GaN (gallium nitride) devices that can break through the limitations of traditional silicon devices.
ROHM serves as a one-spot provider of all power solutions required for the next generation server PSUs. For the primary-side circuits with increased voltage and current, ROHM’s lineup includes industry-leading SiC devices and high-speed GaN devices, realizing an outstanding increase in the efficiency. In addition, for rectification applications on the secondary side of the 50 V output, which is common in AI servers and the like, high-performance LVMOSs, such as products with a breakdown voltage of 80 V, are available, reducing conduction losses to the maximum extent possible. As a matter of course, highly cost-effective super junction MOSFETs (SJ-MOSFETs), which are ideal for the low-speed-side switches of totem-pole PFCs, are also widely available.
In addition to these wide-ranging device portfolios, ROHM can provide system-level proposals, from gate drivers to control ICs, that can maximize device performance. This is the very strength of ROHM. This page introduces ROHM’s latest technologies and solutions that support future AI data centers.
Block Diagram
- 1kW 12V output PSU with single phase 230VAC
- 3kW 50V output PSU with single phase 230VAC
- 5.5kW 50V output PSU with single phase 230VAC
- 12kW 50V output PSU with sigle phase 230VAC/346VAC
- 28kW 400V output PSU with Three pase 400VAC/600VAC
- 28kW 800V output PSU with Three phase 400VAC
- 17kW 50V output/400V or 800VDC input
1kW 12V outoput PSU with single phase 230VAC
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3kW 50V output PSU with single phase 230VAC
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5.5kW 50V output PSU with single phase 230VAC
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12kW 50V output PSU with sigle phase 230VAC/346VAC
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28kW 400V output PSU with Three pase 400VAC/600VAC
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28kW 800V output PSU with Three phase 400VAC
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17kW 50V output/400V or 800VDC input
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Technical information
Topology Selection
When designing circuits, especially power circuits, it's essential to choose a circuit configuration that aligns with the required specifications, as the input/output voltages, power levels, and isolation needs will vary by application. Optimal component selection also depends on the topology. Using inappropriate components can lead to performance shortfalls, potentially requiring a complete redesign of the circuit. ROHM’s topology selection page helps users identify the most suitable devices for various circuit designs.
Reference Design
ROHM provides a system-level evaluation board (solution board) that combines ROHM's IC and discrete products. We have already solved not only the characteristics of individual products but also the problems that may occur when combining them to build a system, thus contributing significantly to the reduction of development time for our customers.
Design Model
ROHM offers simulation models, including thermal models, PLECS models, and Ray files, for circuit and thermal simulations of discretes and ICs, including power devices.
ROHM Solution Simulator
ROHM Solution Simulator is a new web-based electronic circuit simulation tool that can carry out a variety of simulations, from initial development that involves component selection and individual device verification to the system-level verification stage.
*MyROHM Login Required.
Product-related materials
Product Longevity Program (PLP)
To ensure long-term reliability for industrial and other long-life equipment, we disclose supply periods for products covered under our Product Longevity Program.
Catalog
On this catalog page, ROHM has compiled various brochures listing our products and solutions by market, application, solution, and product.
White Paper
This white paper introduces ROHM’s comprehensive power solutions across power devices and analog ICs, with thermal design simulations, board-level design strategies, and real-world implementation examples.
Application Note
This application note page compiles practical information for immediate use in design and evaluation, including how to interpret thermal resistance and heat dissipation, as well as key precautions for temperature measurement.
- What Is Thermal Design
- Basics of Thermal Resistance and Heat Dissipation
- Method for Calculating Junction Temperature from Transient Thermal Resistance Data
- Notes for Temperature Measurement Using Thermocouples
- Two-Resistor Model for Thermal Simulation
- Notes for Temperature Measurement Using Forward Voltage of PN Junction
- What is a Thermal Model? (SiC Power Device)
- How to Use Thermal Models
- Measurement Method and Usage of Thermal Resistance RthJC
- Precautions When Measuring the Rear of the Package with a Thermocouple
Adoption ・ Collaboration Examples
Case Studies
Murata Power Solutions
5.5kW Output AI Server Power Supplies
ROHM’s EcoGaN™ contribute to improving power supply efficiency/p>
Case Studies
COSEL Co., Ltd.
3.5kW Output AC-DC Power Supply Units
ROHM's SiC MOSFETs and SBDs contribute to high efficiency power supplies
Case Studies
Murata Power Solutions
Data Power Supply Units
ROHM SiC SBDs contribute to increase performance and reduce the size of application
Collaboration Examples
ROHM and Delta Electronics Form a Strategic Partnership on Developing Power Devices for Power Supply Systems
Accelerating technological innovation in power supply systems centered on GaN power devices
Video
100V Power MOSFET for AI Servers RY7P250BM
Developed the RY7P250BM, a 100V power MOSFET that combines Wide-SOA and low on-resistance, making it ideal for hot-swap circuits in AI servers.
2-in-1 SiC Molded Modules DOT-247
The 2-in-1 SiC module ‘DOT-247,’ ideal for PV inverters, UPS systems, and semiconductor relays. It inherits the highly versatile ‘TO-247’ while delivering greater design flexibility and power density.
SiC Power Devices
ROHM has recently released SiC MOSFETs that deliver unprecedented ON resistance along with faster switching speeds.
650V GaN | Tech Explainer
ROHM EcoGaN™ power products are the answer to power supply system communication and reliability.
ROHM Super Junction MOSFETs
ROHM utilizes super junction technology for its high voltage (600V+) power MOSFETs.
Current Sensing Solutions
ROHM offers a comprehensive range of current sensing solutions, including resistive current sensing ICs along with key components like op amps, current sense amps, and shunt resistors. ROHM current sensors deliver high accuracy detection for efficient energy management. By replacing magnetic field detection types, mounting area can be significantly reduced, contributing to more compact, lightweight applications.
ROHM’s Product Longevity Program
when designing new products. This time, we will talk about ROHM’s Product Longevity Program (PLP) that addresses these concerns, allowing customers to select products with greater confidence.
