Silicon Labs has introduced a new family of high-speed, multi-channel digital isolators designed to provide complete, highly integrated solutions for signal and power isolation.
The Si88xx series isolator has an integrated DC-DC converter with an efficiency of 78%, can provide up to 2W of power, and has very low electromagnetic interference (EMI) radiation and high noise immunity. The Si88xx series reduces system costs, speeds time to market, and improves performance in harsh, noisy operating environments including factory automation, process control, programmable logic controllers (PLCs), solar inverters, and automotive battery management. Application reliability.
The isolator series meets the critical requirements of industrial automation for plug-and-play isolated power supplies. Developers often have to design isolated power supplies from scratch, a time-consuming, frustrating, and costly process that requires many discrete components. Discrete power isolation solutions typically use field effect transistors (FETs), controllers, single-channel isolators or optocouplers, and other components. In contrast, a multi-channel Si88xx-based isolator-based design requires only the addition of a miniature ferrite core transformer and several discrete passive components. The Si88xx isolator-based solution ultimately saves multiple design iterations, reduces the bill of materials (BOM) cost and design complexity, and improves immunity and power efficiency.
Si88xx digital isolators provide up to 2W of isolation power by collecting power from the primary side to provide secondary side power. Isolators provide up to four high-speed digital isolation channels with excellent timing characteristics, including low propagation delay and low jitter, for longer system life at high voltages. These signal isolation features are essential for developers designing industrial automation, battery management, and motor control systems that require long-term performance. Compared to traditional isolation technologies including optocouplers, the low-power, high-speed Si88xx digital isolation channels have significant data rate, propagation delay, and reliability advantages. The Si88xx family supports data rates up to 100 Mbps, while Si8xx devices achieve a typical 23ns propagation delay.
The Si88xx isolators combine proven, patented digital isolator technology with on-chip isolated DC-DC converters to provide a stable output voltage of 3.3V or 5V at peak output power levels up to 2W (if external components are used, then (> 5V). A robust DC-DC converter architecture combined with a ferrite core isolated transformer provides sufficient power for the secondary side of the isolator and other components such as RS-485 or CAN transceivers, microcontrollers and analog Digital converter) self-powered. Converter (ADC). The Dc-DC converter is based on an improved flyback architecture with secondary-side sensing and feedback to the controller via external compensation. Power switches use Zero Voltage Switching (ZVS) technology to minimize power loss and use jitter to minimize EMI.
The Si88xx isolators have a variety of safety features, including built-in soft-start, which prevents inrush current, cycle-by-cycle current limit, and thermal detection / shutdown. The integrated DC-DC converter includes a built-in secondary sensing and feedback signal, eliminating the need for an additional optical feedback path, and has excellent line and load regulation capabilities, which improves system stability. The company said that the DC-DC converter also has a shutdown option and a user-adjustable switching frequency to fine-tune the EMI curve to suit each developer's application needs.
Vice President and General Manager Ross Sabolcik said: "The new Si88xx series will provide Silicon Labs' digital isolator technology with superior EMI performance, high data rates and reliability to meet the requirements of signal and power isolation and higher channel number Demanding applications. "Analog, power and sensor products, Silicon Labs. "Si88xx digital isolators provide industrial system developers with a complete plug-and-play solution that can greatly simplify their power applications while ensuring long-term performance and reliability."
Samples and production quantities of Si88xx digital isolators are now Available in 20-pin WB SOIC package. Ordering options include selection of DC-DC converter functions, isolation channel configuration and fail-safe mode. The company said that all Si88xx products have passed UL, CSA, VDE and CQC certifications.
