Current Sensors

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Silicon Labs' isolated AC and high-side DC current sensors provide current sensing solutions for a wide range of power applications. The Si85xx family is ideal for a broad range of applications including ac-dc switching power supplies, isolated dc-dc supplies, UPS systems, motor control and electronic lighting ballasts.

The Si850x/1x products are uni-directional ac current sensors available in 10 and 20 A versions and provide a large output signal level of 2.0 V at full scale output range. These products offer size and performance advantages over current transformers, Hall effect devices, DCR circuits and other approaches. The Si850x/1x isolators are extremely low loss, adding less than 1.3 mΩ of series resistance and less than 2 nH of series inductance in the sensing path at 25 ºC. Current-sensing terminals are isolated from the other package pins to a maximum voltage of 1 KVDC.

The Si8540 is a uni-directional, high-side current sense amplifier designed for use in applications that require current monitoring and control. This cost-effective high-side current sense amplifier operates with common mode voltages to 36 V (max). It operates over a frequency range of DC-20 KHz and can be configured to measure full-scale currents from 100 mA to 10 mA.

 

Features

Isolated AC Current Sensors (Si850x/1x)

  • 5, 10 and 20 A full-scale versions, 2 VPP output swing
  • Available 5 kV isolation rating
  • ±5% measurement accuracy
  • Low loss: < 1.3 mΩ series resistance
  • Leading-edge noise suppression
  • “Ping-Pong” output mode allows one Si851x to replace two current transformers in full-bridges
  • High-side or low-side current sensing

 

High-Side DC Current Sensor (Si8540)

  • +5 to +36 V supply operation
  • 0.2% full scale accuracy
  • 90 μA max supply current
  • 9 μA shutdown current
  • -40 to +85 ºC
 

Applications

 

Technologies

  • Proprietary, ultra low-loss inductive sensing technology for high measurement accuracy and low-noise output signal. No external components except for VDD bypass cap.

Documentation    Expand All   Collapse All

 
 Get notified when these documents are updated.

Data Sheet (2)

Document NameDescriptionVersionLast Updated
Si8540.pdf
Si8540 Data Sheet1.15/18/2010
Si85xx.pdf
Si85xx Data Sheet0.38/24/2011

User Guides (2)

Document NameDescriptionVersionLast Updated
Open-Loop_POL-EVB.pdf
Open-Loop POL-EVB User's Guide0.39/20/2010
Si85xx-TB_UG.pdf
Si85xx Target Board User's Guide0.48/5/2010

Application Notes (4)

Document NameDescriptionVersionLast Updated
AN329.pdf
AN329: Extending the Current Range of the Si85xx0.3
AN398.pdf
AN398: Using Si85xx Current Sensors in Switch-Mode Power Supplies0.121/14/2010
AN497.pdf
AN497: Adding Overcurrent Protection to ISOdrivers0.15/10/2010
AN520.pdf
AN520: CMOS Advanced Galvanic Isolators for Medical Electronics0.16/17/2010

White Papers (2)

Document NameDescriptionVersionLast Updated
Evaluating-AC-Current-Sensor-Options-for-Power-Delivery-Systems.pdf
Evaluating AC Current Sensor Options for Power Delivery Systems
ISOdriver White Paper.pdf
ISOdriver White Paper4/19/2010

PCN (3)

Document NameDescriptionVersionLast Updated
1110051 C-Pak as a Tape and Reel Supplier std.pdf
1110051 C-Pak as a Tape and Reel Supplier std
1102181.pdf
Si8540 Assembly Supplier Change IDS to UNISEMM Std
1005251.pdf
Si8540 MSL2A Improvement and Datasheet rev1.1 Std

Development Kits

 

Design Tools    Expand All   Collapse All

 
 Get notified when these files are updated.

Models (1)

Document NameDescriptionVersionUpdated
Si86xx_IBIS_Models.zip
Si86xx IBIS Models0.510/19/2011
 

 

Product Matrix


Part Number Available DocumentsPin 7 FunctionPackageFull Scale CurrentDev KitTemperature RangeInitial AccuracyOutput ModeIsolation Rating
Si8501-B-GMSample
Buy
Data Sheet
Integrator Reset Time Programming Input 12-pin QFN/20-pin SOIC5-40 to 125 °C5%Single1 or 5 kV rms
Si8501-C-IMData Sheet
Integrator Reset Programming Time Input12-pin QFN5-40 to 125 °C5%Single1 kV rms
Si8501-C-ISData Sheet
Integrator Reset Programming Time Input20-pin SOIC5-40 to 125 °C5%Single5 kV rms
Si8502-B-GMSample
Buy
Data Sheet
Integrator Reset Time Programming Input 12-pin QFN/20-pin SOIC10-40 to 125 °C5%Single1 or 5 kV rms
Si8502-C-IMData Sheet
Integrator Reset Programming Time Input12-pin QFN10-40 to 125 °C5%Single1 kV rms
Si8502-C-ISData Sheet
Integrator Reset Programming Time Input20-pin SOIC10-40 to 125 °C5%Single5 kV rms
Si8503-B-GMSample
Buy
Data Sheet
Integrator Reset Time Programming Input 12-pin QFN/20-pin SOIC20-40 to 125 °C5%Single1 or 5 kV rms
Si8503-C-IMData Sheet
Integrator Reset Programming Time Input12-pin QFN20-40 to 125 °C5%Single1 kV rms
Si8503-C-ISData Sheet
Integrator Reset Programming Time Input20-pin SOIC20-40 to 125 °C5%Single5 kV rms
Si8511-B-GMSample
Buy
Data Sheet
Integrator Reset Time Programming Input 12-pin QFN/20-pin SOIC5-40 to 125 °C5%Ping-Pong1 or 5 kV rms
Si8511-C-IMData Sheet
Integrator Reset Programming Time Input12-pin QFN5-40 to 125 °C5%Ping-Pong1 kV rms
Si8511-C-ISData Sheet
Integrator Reset Programming Time Input20-pin SOIC5-40 to 125 °C5%Ping-Pong5 kV rms
Si8512-B-GMSample
Buy
Data Sheet
Integrator Reset Time Programming Input 12-pin QFN/20-pin SOIC10-40 to 125 °C5%Ping-Pong1 or 5 kV rms
Si8512-C-IMData Sheet
Integrator Reset Programming Time Input12-pin QFN10-40 to 125 °C5%Ping-Pong1 kV rms
Si8512-C-ISData Sheet
Integrator Reset Programming Time Input 20-pin SOIC10-40 to 125 °C5%Ping-Pong5 kV rms
Si8513-B-GMSample
Buy
Data Sheet
Integrator Reset Time Programming Input 12-pin QFN/20-pin SOIC20-40 to 125 °C5%Ping-Pong1 or 5 kV rms
Si8513-C-IMData Sheet
Integrator Reset Programming Time Input12-pin QFN20-40 to 125 °C5%Ping-Pong1 kV rms
Si8513-C-ISData Sheet
Integrator Reset Programming Time Input20-pin SOIC20-40 to 125 °C5%Ping-Pong5 kV rms
Si8517-B-GMData Sheet
Fault Output12-pin QFN/20-pin SOIC5-40 to 125 °C5%Ping-Pong with FAULT output1 or 5 kV rms
Si8517-C-IMData Sheet
FAULT Output12-pin QFN5-40 to 125 °C5%Ping-Pong1 kV rms
Si8517-C-ISData Sheet
FAULT Output20-pin SOIC5-40 to 125 °C5%Ping-Pong1 kV rms
Si8518-B-GMData Sheet
Fault Output12-pin QFN/20-pin SOIC10-40 to 125 °C5%Ping-Pong with FAULT output1 or 5 kV rms
Si8518-C-IMData Sheet
FAULT Output12-pin QFN10-40 to 125 °C5%Ping-Pong1 kV rms
Si8518-C-ISData Sheet
FAULT Output20-pin SOIC10-40 to 125 °C5%Ping-Pong5 kV rms
Si8519-B-GMData Sheet
Fault Output12-pin QFN/20-pin SOIC20-40 to 125 °C5%Ping-Pong with FAULT output1 or 5 kV rms
Si8519-C-IMData Sheet
FAULT Output12-pin QFN20-40 to 125 °C5%Ping-Pong1 kV rms
Si8519-C-ISData Sheet
FAULT Output20-pin SOIC20-40 to 125 °C5%Ping-Pong5 kV rms
Si8540Data Sheet
5-pin SOT or 8-pin SOIC0.1 to 10 A-40 to 85 °C0.2%Current

Training & Resources

Featured Videos

Digital Isolation: Replacing Legacy Optocouplers
Learn why digital isolators enable the replacement of optocouplers
Isolation Technology Overview
See how CMOS technology enables smaller, faster, more reliable system isolation than optocouplers
Reduce EMI in Medical Applications
Reduce EMI in Medical Applications

 

Featured Web Utilities

Isolator Power Consumption Calculator

Find out exactly how much power the isolation configuration in your system will consume with the first ever isolator power consumption calculator. Simply choose the settings that match your design, and the utility will provide detailed power and current data.
» Isolator Power Consumption Calculator

Take the ISOdriver Challenge

Whether you are using a current isolation product or starting a new design, use this web-based utility to challenge your current optocoupler, opto + driver, gate drive transformer, isolated gate driver or digital isolator + driver solution and find out how Silicon Labs isolation technology can improve your system.
» Take the ISOdriver Challenge

Cross-Reference Search Utility

Enter the part number from another company into the Cross-Reference Search Utility to find a list of Silicon Labs products that can replace those parts. Once you find the products you need, you can click on the part number to see more details about the Silicon Labs device, download the data sheet by clicking on the data sheet link, and export the results to Excel.
» Cross-Reference Search Utility

Isolators Parametric Search

With support for multiple isolation ratings, expanded packaging options, increased channel counts and data-rate options, it is easy to select the optimal digital isolator configuration based on application, performance and cost. Use this reference for selecting the perfect digital isolator part number for your next project.
» Isolators Paramteric Search

ISOdrivers Parametric Search

High integration, low propagation delay, small PCB footprint, flexibility, and cost-effectiveness make the Si822x/3x ISOdriver families ideal for a wide range of isolated gate drive applications. Use this utility to find the perfect part for your solution.
» ISOdrivers Parametric Search

Featured White Papers

When to Use a Digital Isolator vs. an Optocoupler

Over the last four decades, optocouplers have been the "default" signal isolation device, but recent breakthroughs in silicon isolation technology have spawned smaller, faster, and more reliable and cost-effective solutions that have already begun supplanting optocouplers in many end applications. This white paper discusses industrial isolation issues and ways RF isolation technology can be applied to increase system robustness and performance.
» When to Use a Digital Isolator vs. an Optocoupler

Enhancing Power Delivery System Designs with CMOS-Based Isolated Gate Drivers

As emerging green standards challenge designers to deliver more energy-efficient, cost-effective and reliable power delivery systems in smaller form factors, the need for greater power and isolation device integration becomes increasingly important. A critical building block within ac-dc and isolated dc-dc power supplies is the isolated gate driver. While optocoupler-based solutions and gate-drive transformers have been the mainstay for switch-mode power supply (SMPS) systems for many years, fully-integrated isolated gate driver products based on RF technology and implemented in mainstream CMOS provide a more reliable and power-efficient solution.
» Enhancing Power Delivery System Designs with CMOS-Based Isolated Gate Drivers

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