Power Supplies

650W Modular PSUs with BF Isolation Deliver up to 10 Outputs

TDK Corporation announced the introduction of the TDK-Lambda brand QM4 series of ac-dc modular power supplies. The QM4 series reduces the footprint by 15% compared to the previous QM series PSUs. The 108mm wide QM4 can accept up to four single- or dual-output modules and a dual output standby/signal board to provide up to 10 outputs.

All models in the QM series feature full MOPPs isolation and have low acoustic noise. With medical and industrial safety certifications, the QM series is suitable for a wide range of applications, including BF-rated medical equipment, broadcast, communications, renewable energy, and test and measurement.

The QM4 can deliver 650W output power with a 180Vac to 264Vac input and 550W with a wide range 90Vac to 264Vac input. Output voltages from 2.8V to 105.6V can be specified and an optional standby/signal module can be fitted. The standby/signal module provides a choice of one or two standby voltages (5V, 12V, and 13.5V at up to 2A). It also offers a PMBus™ communication interface, unit inhibit or enable, and has an ac-Good signal.

The PSUs can operate in ambient temperatures of -20ºC to +70ºC, derating output power and output current by 2.5% per ºC above 50ºC.

Case dimensions are 108mm x 63.5mm x 270mm and the weight is between 1.125kg and 1.845kg, depending on the module configuration.

Operating efficiency is up to 91%, reducing internal heat losses and allowing the use of a low-speed, low-audible-noise fan for cooling. This fan enhances the patient/user experience and increases reliability. TDK also backs the series with a seven-year warranty.

With CE marking for the EMC, Low Voltage, and RoHS2 directives, the QM series power supplies are certified to IEC/EN/UL/CSA 60601‑1, ANSI/AAMI ES 60601‑1, IEC/EN 61010‑1, and IEC/EN/UL/CSA 60950‑1.

Input to output isolation of 4,000Vac (2 x MOPPs), 1,500Vac input to ground (1 x MOPP) and 1,500Vac (1 x MOPP) output to ground allows the series to be utilized in BF-rated medical equipment including blood pressure monitors and incubators.

The QM4 complies with the EN61000-6-3:2007 and EN60601-1-2:2015 (curve B conducted and radiated) emission standards while having a maximum earth leakage current of 300µA. The units also meet the EN60601-1-2 and EN61000-6-2 immunity standards.

An online configurator makes selecting products from the QM series extremely simple, and it offers an optimized module selection with a choice of signals, leakage current, and standby voltages.

Upon entering the desired output currents and voltages, the configurator automatically produces a short 7 digit code to facilitate easy order placement.

(Click on chart to enlarge)

Features and Benefits
  • 650W output with a 180Vac to 264Vac input and 550W with 90Vac to 264Vac input
  • BF-ready medical isolation (MOPP) eases design into systems (including BF)
  • Low-speed, low-audible-noise fan provides enhanced patient / user experience
  • Up to 10 outputs eliminates need for additional supplies
  • PMBus communication option Remote monitoring and control
  • 7-year warranty Low cost of ownership
  • Frequency 47 – 63 Hz (440Hz with reduced PFC)
  • Input fuses 16A / 250Vac HBC Fast acting (not user accessible) in both
  • Live and Neutral lines (single fusing optional)
  • Inrush current <40A at 25°C and 264Vac (cold start)
  • Touch current <100µA
  • Power factor > 0.95 (at 100% load)
TDK Corporation
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