ایزولاتور ایزولاتور دیجیتال

Product Attributes

Introduction

The ISOW7721 device is a galvanically-isolated dual-channel digital isolator with an integrated high-efficiency power converter with low emissions. The integrated DC-DC converter provides up to 550 mW of isolated power, eliminating the need for a separate isolated power supply in space-constrained isolation designs. If additional power is needed, the ISOW7721 supports multi-device chaining, increasing the integrated power output to > 1 W using two devices in a system. The high-efficiency of the power converter allows for operation at a wide operating ambient temperature range of -40°C to +125°C. This device provides improved emissions performance, allowing for simplified board design and has provisions for ferrite beads to further attenuate emissions. The ISOW7721 has been designed with enhanced protection features in mind, including soft-start to limit inrush current, over-voltage and under-voltage lock out, overload and short-circuit protection, and thermal shutdown. The ISOW7721 provide high electromagnetic immunity while isolating CMOS or LVCMOS digital I/Os. The signal-isolation channel has a logic input and output buffer separated by a double capacitive silicon dioxide (SiO₂) insulation barrier, whereas, power isolation uses on-chip transformers separated by thin film polymer as insulating material. The ISOW7721 has 1 forward channel and 1 reverse channel. If the input signal is lost, the default output is high for the ISOW7721 device without the F suffix and low for the ISOW7721F.

Features

• 100 Mbps data rate
• Integrated DC-DC converter with low-emissions, low-noise
  • Emissions optimized to meet CISPR 32 and EN 55032 Class B with >5 dB margin on 2 layer board
  • Low frequency power converter at 25 MHz enabling low noise performance
  • Low output ripple: 24 mV
• High efficiency output power
  • Efficiency at max load: 46%
  • Up to 0.55-W output power
  • VISOOUT accuracy of ±5%
  • 5 V to 5 V: Max available load current = 110 mA
  • 5 V to 3.3 V: Max available load current = 140 mA
  • 3.3 V to 3.3 V: Max available load current = 60 mA
• Support for multi-ISOW7721 chain to increase system power output to >1 W and >200 mA
• Independent power supply for channel isolator & power converter
  • Logic supply (V₁₀): 1.71-V to 5.5-V
  • Power converter supply (VDD): 3-V to 5.5-V
• Robust electromagnetic compatibility (EMC)
  • System-level ESD, EFT, and surge immunity
  • ±8 kV IEC 61000-4-2 contact discharge protection across isolation barrier
• Reinforced and Basic isolation options
• High CMTI: 100-kV/μs (typical)
• Safety Related Certifications (Planned):
  • VDE reinforced and basic insulation per DIN VDE V 0884-11:2017-01
  • UL 1577 component recognition program
  • IEC 62368-1, IEC 61010-1, IEC 60601-1 and GB 4943.1-2011 certifications
• Extended temperature range: -40°C to +125°C
• 20-pin wide body SOIC package

Applications

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