TDK Releases 4.5 kW AC-DC Power Supply With Dual Outputs

TDK Corporation has introduced the TDK-Lambda TPS4500, a 4,500 W industrial AC-DC power supply designed for high-voltage three-phase inputs and applications that need flexible DC rails without moving to a full laboratory-grade programmable supply.

The TPS4500 accepts 360-528 VAC three-phase input in delta or Wye configurations. It can be used as a single-output or dual-output supply, with the ability to split available power between rails in any proportion up to the unit’s ratings.

TDK-Lambda is positioning the series for test and measurement, semiconductor fabrication tools, additive manufacturing, printers, lasers, and RF power amplifiers, where three-phase mains are common and where system builders often prefer rackable, safety-certified modules that can be monitored over a digital bus.

The TPS4500. Image used courtesy of TDK

One Supply, Two Rails

At a glance, the TPS4500 is a high-power converter that offers two nominal output levels: 92 V at 49 A and 184 V at 24.5 A. The more interesting part is how much the outputs can move. Via PMBus programming, the 92 V rail can be set to 10-96.5 V, while the 184 V rail can be set to 20-193 V. TDK also supports adjustment via a trim potentiometer and analog programming.

That range is important because it changes how a system designer can “standardize” a power stage. A single supply family can cover a wide swath of voltage requirements for industrial loads, while still delivering multi-kilowatt power. It also enables a practical dual-rail architecture, where one rail can be tuned for a high-voltage load and the other for a secondary rail, with the unit’s internal power budget allocated as needed. TDK says the two outputs can share the load in any proportion, up to rated output specifications.

TPS4500 supports constant-voltage and constant-current operation through voltage and current programming, with adjustable overcurrent protection that behaves as a constant-current limit. A 12 V, 0.3 A standby output is included for housekeeping power, and TDK provides status outputs for AC fail, DC good, and dropped-phase conditions.

For scaling beyond a single module, the TPS4500 is designed to run supplies in series or parallel. The datasheet also notes a current-share mechanism supporting parallel operation up to eight units, with a derating requirement when used that way.

Plug Straight Into Industrial Mains

The TPS4500’s input spec is clearly tuned for factory power. Instead of targeting single-phase “universal” mains, it operates from 360-528 VAC three-phase input (delta or Wye), covering the nominal 400 VAC, 440 VAC, and 480 VAC systems used globally. TDK calls out a 47-63 Hz input frequency range, 9 A per-phase steady-state input current at nominal voltage, and a typical power factor of 0.92 at rated load.

Accepting high-voltage three-phase input can avoid the need for a step-down transformer in systems that would otherwise need to convert facility power to a form that a supply can accept. It also helps with phase load balancing, which becomes more important as power levels rise and as equipment racks fill with multiple high-power loads.

Terminal block diagram. Image used courtesy of TDK

The TPS4500 also includes a dropped-phase warning signal, and the datasheet lists reduced output power levels under dropped-phase operation at 400 VAC and 480 VAC. In other words, it is designed to detect and report an input fault condition, and it is characterized for operation in that degraded state, which can be useful in systems where fault logging and controlled shutdown are preferred to an instantaneous hard stop.

PMBus Telemetry and Ruggedization

A 4.5 kW supply rarely lives in isolation. It sits inside systems where uptime matters and where power telemetry has become part of maintenance. TPS4500 includes a PMBus communications interface for monitoring and control, with real-time visibility into output voltage, output current, internal temperature, status signals, and fan speed. It also supports programming of output voltage, overcurrent limit, and remote on/off behavior.

PMBus is widely used as a standardized digital interface for managing power converters, particularly where system controllers need telemetry and remote configuration rather than a simple analog “set and forget” supply. In practical terms, the value is less about any single measurement and more about integrating power health into the same monitoring stack that already tracks temperatures, fans, and interlocks.

On the mechanical side, TPS4500 is packaged for 2U rack environments, with an enclosure measuring 107 x 85 x 335 mm and a typical weight of 4 kg. It is rated for startup at -40°C and operation from -10°C to +70°C with defined derating above 50°C. Typical efficiency is listed at 93%.

TDK lists safety certifications, including IEC/UL/CSA/EN 62368-1, with CE and UKCA markings, plus EMC and immunity compliance references such as EN 55032 Class A emissions (in the end system) and IEC 61000-4 series immunity tests. Isolation ratings are specified at 3 kVAC input-to-output, 2 kVAC input-to-ground, and 500 VDC output-to-ground. TDK also notes compliance with IEC 62477-1 overvoltage category III, which is typically associated with permanently installed industrial equipment connected to building distribution systems.