Auxiliary Power Supply for Industrial and Solar Applications

Reference Design features Microchip 1700V SiC MOSFET
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1700 V Auxiliary Power Supply Reference Design from Microchip

1700 V Auxiliary Power Supply Reference Design from Microchip

A 1.7 kV SiC MOSFET is an excellent choice for using a single-switch flyback topology in an auxiliary power supply application that requires a wide input voltage range. The 1.7 kV breakdown voltage provides sufficient voltage margin for the 1 kV input voltage. The specific on-resistance of a 1.7 kV SiC MOSFET is much lower than that of a high-voltage silicon MOSFET, allowing for a smaller die size and lower on-resistance in the same package. The smaller die size also significantly reduces switching loss. This option allows the user to increase the switching frequency of the auxiliary power supply in order to reduce transformer size and weight.

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Auxiliary Power Supply  for Industrial and Solar Applications

Topology of single-switch flyback converter with a 1.7 kV SiC MOSFET for auxiliary power supply applications

Features

  • Single-switch flyback topology
  • Wide input voltage: 250 V–1000 V
  • +24V/2A and +15V/1A dual outputs; 63 W total output power
  • High-power conversion efficiency over wide power range
  • Current-mode PWM (pulse-width modulation) controller-based closed loop control

    • Applications

  • Industrial motor drives
  • Solar inverters
  • Uninterruptible power supplies
  • General purpose inverters
  • Cascaded H-bridge converters
  • Modular multilevel converters

    • Reference Design  BOM

    The MSC750SMA170 included in this reference design BOM is part of Microchip’s newest family of SiC MOSFET devices. Microchip’s SiC solutions focus on high-performance, helping to maximize system efficiency and minimize system weight and size. Microchip’s proven SiC reliability also ensures no performance degradation over the life of the end equipment.

    Part Number
    Voltage (V)
    Current (A)
    Rds(on) (mΩ)
    Configuration
    Package Type
    MSC750SMA170B
    1700
    7
    750
    Single SiC MOSFET
    TO-247-3L
    MSC750SMA170SA
    1700
    6
    750
    Single SiC MOSFET
    D2PAK-7L
    MSC750SMA170S
    1700
    6
    750
    Single SiC MOSFET
    TO-268
    MSC750SMA170B4
    1700
    7
    750
    Single SiC MOSFET
    TO-247-4L

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    Our team of global applications engineers are available to answer your questions to ensure your power conversion or energy storage system design meets your performance expectations. If you’re transitioning from silicon to gallium nitride (GaN) or silicon carbide (SiC), we’ll help identify the right switching device to achieve the power density and increased efficiency your application requires.
     
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