High Isolation DC/DC Converters for Gate Drivers

The simplest (functional) isolation of a DC/DC converter can withstand 1kVDC for one second, however this is often not sufficient for high-side gate drivers. RECOM combines the required high insulation voltage, asymmetric output voltages, and low isolation capacitance into one simple DC/DC module.

High side inverters are often floated a few hundred volts with an opto-isolated PWM control, so the gate drivers need an isolated power supply. This isolated supply is typically +15/-9V for IGBT, +20/-5V for SiC (+15/-3V for 2nd Gen. devices) or +6V and +9V for GaN. A typical DC/DC isolation voltage would be at least twice the working voltage, but the high ambient temperature and fast switching edges generated by these high-power transistors additionally stress the insulation barrier. Whether IGBT, SiC MOSFET or GaN HEMT, RECOM has the matching DC/DC converter module, featuring the required asymmetric output voltages, high insulation voltage and low isolation capacitance. The R-REF01-HB reference design can be used to compare the real-life performance of various high power switching technologies.

Main features:

  • High isolation up to 6.4kVDC/1sec
  • Reinforced or functional isolation
  • High efficiency up to 87%
  • Ultra-compact SMD and SIP7 design
  • UL/IEC/EN60950-1 or 62368-1 certified
  • 3-year warranty

Applications:

  • IGBT, SiC, Si and GaN driver circuits
  • Motor control units
  • General purpose inverter
  • Uninterruptible power supplies
  • Welding machines
  • EV battery chargers
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