ADuM4121

High Voltage, Isolated Gate Driver with Internal Miller Clamp, 2 A Output with Thermal Shutdown

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Overview

Features and Benefits

  • 2 A peak output current (<2 Ω RDSON)
  • 2.5 V to 6.5 V input 
  • 4.5 V to 35 V output 
  • Undervoltage lockout (UVLO) at 2.5 V VDD1 
  • Multiple UVLO options on VDD2
    • Grade A: 4.4 V (typical) UVLO on VDD2
    • Grade B: 7.3 V (typical) UVLO on VDD2
    • Grade C: 11.3 V (typical) UVLO on VDD2
  • Precise timing characteristics
    • 53 ns maximum isolator and driver propagation delay
  • CMOS input logic levels
  • High junction temperature operation: 125°C
  • High common-mode transient immunity: >150 kV/µs
  • Default low output
  • Internal Miller clamp
  • Safety and regulatory approvals (pending) 
    • UL recognition per UL 1577 
    • 5 kV rms for 1 minute SOIC long package
  • CSA Component Acceptance Notice 5A
  • VDE certificate of conformity (pending)
    • DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
    • VIORM = 849 V peak
  • Wide body, 8-lead SOIC

Product Details

The ADuM4121/ADuM4121-1 are 2 A isolated, single-channel drivers that employ Analog Devices, Inc.’s iCoupler® technology to provide precision isolation. The ADuM4121/ADuM4121-1 provide 5 kV rms isolation in the wide-body, 8-lead SOIC package. Combining high speed CMOS and monolithic transformer technology, these isolation components provide outstanding performance characteristics superior to alternatives such as the combination of pulse transformers and gate drivers.

The ADuM4121/ADuM4121-1 operate with an input supply ranging from 2.5 V to 6.5 V, providing compatibility with lower voltage systems. In comparison to gate drivers that employ high voltage level translation methodologies, the ADuM4121/ ADuM4121-1 offer the benefit of true, galvanic isolation between the input and the output.

The ADuM4121/ADuM4121-1 include an internal Miller clamp that activates at 2 V on the falling edge of the gate drive output, supplying the driven gate with a lower impedance path to reduce the chance of Miller capacitance induced turn on.

Options exists to allow the thermal shutdown to be enabled or disabled. As a result, the ADuM4121/ADuM4121-1 provide reliable control over the switching characteristics of insulated gate bipolar transistor (IGBT)/metal oxide semiconductor field, effect transistor (MOSFET) configurations over a wide range of switching voltages.

APPLICATIONS

  • Switching power supplies
  • Isolated IGBT/MOSFET gate drives
  • Industrial inverters
  • Gallium nitride (GaN)/silicon carbide (SiC) power devices

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

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LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

ADUM4121A
ADUM4121B
ADUM4121C

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Reference Materials

Safety and Regulatory Compliance (1)

Safety and Regulatory Compliance Information

Solutions Bulletins & Brochures (1)

ADI Isolated Gate Drivers and Wolfspeed SiC MOSFETs

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

ADUM4121 Material Declaration
Quality And Reliability
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Support & Discussions

ADuM4121 Discussions

RE: ADuM4121 Bootstrap setup
9 week(s) ago in Interface and Isolation
RE: Miller clamp on the ADuM4121
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.