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Texas Instruments ISOW7821 Reinforced Digital Isolators

Texas Instruments ISOW7821 Reinforced Digital Isolators are high-performance, dual-channel digital isolators with an integrated high-efficiency power converter. The integrated DC-DC converter provides up to 650mW of isolated power at high efficiency and can be configured for various input and output voltage configurations. Therefore this device eliminates the need for a separate isolated power supply in space-constrained isolated designs.

The Texas Instruments ISOW7821 provides high electromagnetic immunity and low emissions while isolating CMOS or LVCMOS digital I/Os. The signal-isolation channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. In contrast, power isolation uses on-chip transformers separated by thin film polymer as an insulating material. Various configurations of forward and reverse channels are available. If the input signal is lost, the default output is high for the ISOW7821 device and low for the device with the F suffix.

Features

  • Integrated high-efficiency DC-DC converter with on-chip transformer
  • 3V to 5.5V wide input supply range
  • Regulated 5V or 3.3V output
  • Up to 0.65W output power
  • 5V to 5V; 5V to 3.3V: available load current ≥130mA
  • 3.3V to 3.3V: available load current ≥75mA
  • Soft-start to limit inrush current
  • Overload and short-circuit protection
  • Thermal shutdown
  • Default output (high and low options)
  • Signaling rate up to 100Mbps
  • 13ns typ. (5V supply) low propagation delay 
  • High CMTI (±100kV/µs minimum)
  • 16-pin wide SOIC package
  • Robust Electromagnetic Compatibility (EMC)
    • System-level ESD, EFT, and surge immunity
    • Low emissions
  • –40°C to +125°C extended temperature range 
  • Safety-related certifications
    • 7071VPK reinforced isolation per DIN V VDE V 0884-11:2017-01
    • 5000VRMS isolation for 1 minute per UL 1577
    • CSA certification per IEC 60950-1, IEC 62368-1, and IEC 60601-1 end equipment standards
    • CQC approval per GB4943.1-2011
    • TUV certification according to EN 60950-1 and EN 61010-1
    • All agency certifications are planned

Applications

  • Industrial automation
  • Motor control
  • Grid infrastructure
  • Medical equipment
  • Test and measurement

Simplified Schematic

Schematic - Texas Instruments ISOW7821 Reinforced Digital Isolators

Related Development Tool

Texas Instruments ISOW7841EVM Digital Isolator Evaluation Module

Evaluate the device performance for fast development of the ISOW7841, a digital isolator.

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Paskelbta: 2018-01-05 | Atnaujinta: 2022-10-17