These third-generation power supplies are rated at 28 volts and 504 Watts, measure 4 by 2.4 inches. They have optional read/write programming and communication through a PMBus interface.
The PFH500F-28 series uses gallium nitride (GaN) semiconductors, bridgeless power factor correction, synchronous rectification and digital control to enable efficiencies to 92 percent. Opto-couplers have been replaced by digital isolators for long term reliability and stability.
Accepting an 85 to 265-volt AC input, the power electronics modules deliver 28 volts at 18 amps, and can be adjusted from 22.4 to 33.6 volts using the trim pin or PMBus interface. Baseplate cooling allows operation at temperatures ranging from -40 to 100 degrees Celsius. The metal enclosure measures 4 by 2.4 by 0.53 inches, and is encapsulated for MIL-STD-810G shock and vibration.
Related: Industrial-grade AC-DC power supplies for test and measurement introduced by TDK Lambda
Features and options include a 12-volt standby voltage with 200-milliamp capability, remote on/off, pre-biasing start-up, droop mode current share, a DC good signal, and OVP, UVP, OCP, OTP protections.
Designers can use the COTS PMBus interface to program (read-write) the output voltage and fault management functions and monitor the unit's operating status.
The series has been certified to the IEC/UL/CSA/EN 60950-1 safety standards (62368-1 pending) and carries the CE mark for the low voltage and RoHS directives. Input to ground isolation is 2,500 volts AC, input to output 3,000 volts AC and output to case is 1,500 volts DC.
For more information contact TDK-Lambda Americas online at www.us.tdk-lambda.com.
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