Overcoming Limitations of Optocoupler and High Voltage Gate Driver Solutions

Overcoming Limitations of Optocoupler and High Voltage Gate Driver Solutions

Isolated gate drivers provide electrical isolation as well as strong gate drive capability, which is often required for safety and robustness in many system architectures. The isolated gate driver portfolio from Analog Devices offers designers performance and reliability advantages over designs utilizing optocouplers or pulse transformers. Utilizing ADI’s proven iCoupler® technology, the isolated gate driver family offers the advantage of a maximum propagation delay of 50 ns, less than 5 ns channel-to-channel matching, a 50-year lifetime for 400 V rms working voltage and galvanic isolation in a single package.

EXISTING SOLUTION LIMITATIONS ...

Optocoupler Gate Driver Solution Limitations

Optocoupler-Based Gate Driver Solution Driver Solution
  • Poor Timing Performance
    • Requires longer dead-time effecting overall efficiency
    • Long propagation delays ≥350ns
    • Part-to-part variation ≥200ns
    • Difference between rise and fall times ≥100ns
  • LED Wearout
    • Limits the lifetime to <10 years of operation at high temperature
    • Most rated for operation to 85°C
High Voltage Gate Driver Solution Limitations

High-Voltage Driver Solution
  • Latch-Up When Glitches Go Beyond the Supply Voltage
    • Rely on junction isolation which can breakdown and cause latch-up
    • Latch-up related shoot through best avoided with galvanic isolation
 

ADI's Solution ...

iCoupler Isolated Gate Drivers Overcome the Limitations of Optocoupler- and High Voltage-based Gate Drivers

Isolated Gate Drivers


  • Small Single Package Solution
  • Fastest timing enables higher switching speeds for higher power densities and better efficiency in AC/DC converters, DC/DC converters, inverters, motor control
  • Standard CMOS enables high-reliability at low cost
  • Balanced push-pull output stage simplifies gate driving
  • True galvanic isolation between outputs seperates high and low side minimizing cross conduction

Engineer Zone

Visit Product Pages for Data Sheets and Samples.

  • ADuM3220: 4A Isolated Gate Driver with 2.5kV rms isolation, Overlap Protection and 4V or 7V UVLO
  • ADuM3221: 4A Isolated Gate Driver with 2.5kV rms isolation and 4V or 7V UVLO
  • ADuM3223: 4A Isolated Gate Driver with 3kV rms isolation, Selectable Overlap Protection and 4V, 7V or 11V UVLO
  • ADuM3224: 4A Isolated Gate Driver with 3kV rms isolation, without Thermal Shutdown and 4V, 7V or 11V UVLO
  • ADuM4223: 4A Isolated Gate Driver with 5kV rms isolation, Selectable Overlap Protection and 4V, 7V or 11V UVLO
  • ADuM4224:4A Isolated Gate Driver with 5 kV rms isolation, without Thermal Shutdown and 4V, 7V or 11V UVLO
More....

Visit these pages for Evaluation Board Information.


Additional Resources:

ADuM3223/ADuM4223 Isolated 1/2 Bridge Gate Drivers with iCoupler Technology: Video

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