Features and Benefits

  • 50W, High-Efficiency, Isolated Forward Converter
  • Synchronous Rectified
  • ±36V to ±72V Input Range
  • +3.3V Output at 15A
  • VOUT Regulation Better than 0.5% Over Line and Load
  • 91% Efficiency at 3.3V/10A Output
  • Cycle-by-Cycle Current-Limit Protection
  • Programmable Integrating Fault Protection
  • 1/8th Brick Module Pinout
  • 250kHz Switching Frequency
  • Soft-Start
  • Remote Output Voltage Sense
  • Output Voltage Trim Pin
  • Fully Assembled and Tested

Product Details

The MAX5051 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains a high-efficiency, 50W, isolated, synchronously rectified forward converter in the industry-standard 1/8th brick pinout. The circuit is configured for a +3.3V output voltage and provides up to 15A of output current. The circuit can be powered from either a +36V to +72V or -36V to -72V DC source used in the telecom/datacom markets (48V modules), industrial environments, or in automotive 42V power systems.

Up to 91% high efficiency is achieved at 10A using a clamped, two-transistor power topology on the primary side and synchronous rectifiers on the secondary side. Part of the efficiency improvement is due to the recovery of stored leakage and magnetizing inductance energy at the primary side. On the secondary side, high efficiency is achieved through synchronous rectification. Up to 500V galvanic isolation is achieved by optocouplers and a planar surface-mount transformer.

Operation at 250kHz allows the use of small magnetics and output capacitors. The EV kit provides cycle-by cycle current-limit protection. Integrating fault protection provides additional steady-state fault protection that reduces average dissipated power during continuous short-circuit conditions. The MAX5051 also has a programmable undervoltage lockout (UVLO).

Warning: The MAX5051 EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or power the sources connected to it must be careful to follow safety procedures appropriate to working with high-voltage electrical equipment.

Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this EV kit with care to avoid possible personal injury.


  • 42V Automotive Power Systems
  • 48V and 12V Server Power Supplies
  • 48V Power-Supply Modules
  • High-Efficiency, Isolated Telecom/Datacom Power Supplies
  • Industrial Power Supplies

Documentation & Resources