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Silicon LabsIsolator Production & Application

Agenda

Isolation 101

Silicon Labs isolator product introduction

Isolator Product Application

2

Agenda

Isolation 1011.1 What is isolation1 2 Where Isolation is Used1.2 Where Isolation is Used1.3 Why Isolation is Important1.4 What is Safety Certification?1.5 Key Safety Terminology & Certification1.6 Isolation Techniques 1 7 Summary1.7 Summary

Silicon Labs isolator product introduction

Isolator Product ApplicationIsolator Product Application

3

What is Isolation?

SYSTEM

SUPPLY VOLTAGE A

SUPPLY VOLTAGE B

ISOLATIONBARRIER

DC DCSignal Xfer

BARRIER

No current flow

GROUND A

GROUND B

Galvanic isolation electrically insulates sections of electrical circuits, preventing current flow between these sections

Th bili h i f i b h i iThe ability to exchange energy or information between the sections is maintained

4

Ideal Isolator Model

Input/output signal path behaves as a low impedancep

GND1-to-GND2 path is high impedance

ISOLATORIN OUT

VDD2VDD1

OROR

Net result:Input signal is transferred to output

GND2GND1

Input signal is transferred to output, regardless of common mode difference

No current flow between GND1 and GND 2 (This reduces noise)

GND2GND1

5

Where Isolation is Used

Isolation is used in many applications to:Protect equipment from damage, and protect personnel from injuryQuiet ground noiseQuiet ground noise Level-shift signals between various parts of the system for compatibility

Isolation is used in many different marketsso at o s used a y d e e t a etsIndustrial Automation• Isolated communications, power conversion, analog data acquisitionEnergyEnergy• Solar panel inverters, motor control, high voltage power generationTransportation• Isolated HEV/EV inverters and battery chargersMedical Systems• Isolated ECG/EKG, defibrillators, portable patient monitoringMilitary Systems• Isolated power conversion, instrumentation, weapons systems

6

Why Isolation is Important

I l ti i iti l tIsolation is a critical componentSafety of electronics systems or peopleImproved performance in noisy environments

Common isolation usage examples

e.g. HV Power Systems e.g. High Side Driver e.g. Test and Measurement

Safety Isolation: Isolate potentially lethal voltage from low voltage groundLevel Shift: Match signal amplitude and common mode voltage levels

8

Level Shift: Match signal amplitude and common mode voltage levels Eliminate Noise: Isolate high noise grounds from noise-sensitive circuits

Key Safety Terminology (Reference)

Safety extra-low-voltage: < (30VRMS or 60VDC)

Hazardous: > (30VRMS or 60VDC)

Basic InsulationSingle-level of protection against electric shock. Does not fail safe, must be contained within system. Creepage

Distance along the insulating surfaceReinforced/Double InsulationTwo-levels of protection against electric shock. Fails safe, can be accessible external to system.

Rated (Proof) Isolation Voltage

Distance along the insulating surfacean arc may travel

Rated (Proof) Isolation Voltage Maximum voltage an isolation barrier withstands(Typically 2500 , 3750, or 5000 VRMS @ 1 min)

Production Test VoltagegManufacturer’s test voltageTypically 1.2x the Rated Isolation Voltage

ClearanceShortest path through air 

an arc may travelTypical Guidelines

Insulation Type Creepage/Clearance Proof (Rated)Test Production TestBasic 3.2 mm 2500Vrms (1 min) 3000VRMS (1 sec)

yp

9

( ) RMS ( )Reinforced/Double 6.4mm 5000Vrms (1min) 6000VRMS (1 sec)

What is Safety Certification?

Safety is regulated by a set of international safety standards whose test methods and guidelines ensure end equipment safety from electrical shock, mechanical hazard, fire and electromagnetic interference.mechanical hazard, fire and electromagnetic interference.

There are component (IEC60747-5-2) and system level (e.g. IEC60950) safety standards, and all compliance testing (system or component) is performed by international regulatory agencies (e.g. UL, CSA VDE, TUV, etc.)

System Standard Component Standard

Application StandardOrganization IEC

60204Industrial 60204 60604

InformationTechnology 60950

International U.S. Canada

Organization VDE UL CSA

EquipmentMedical 60601Household 60065

Standard IEC 60747-5-2 1577 Component Notice 5A

10

Measurementand Control 61010

Telecom 60950

What Does the System Spec Require?All system certifications have 3 basic requirements for a given working voltage.

Insulation typeCreepage/clearance Distance requirementIsolation Barrier Test Voltage

Specification Working Voltage Insulation Creepage Clearance Test Voltage Vac (1 Minute)Specification Working Voltage Insulation Creepage Clearance Test Voltage Vac (1 Minute)

IEC601‐1 250 Vac

Basic 4 2.5 1600

Reinforced 8 5 4200IEC601 1 250 Vac Reinforced 8 5 4200

IEC60950‐1 300 Vac

Basic 3.2 2 2400

Reinforced 6.4 4 4800

IEC61010‐1 300 Vac

Basic 3 3 2210

Reinforced 6 6 3536

Knowing the Creepage/clearance Requirements allows designer to select the best

* Pollution Degree 2, Cat III (6kV over transient)

11

g p g q gpackage for the application at hand

Isolation Techniques

Isolation Component Opto- coupler Capacitive Transformer GMR

Isolation Dielectric Epoxy Silicon Dioxide Polyimide PolyimideIsolation Barrier

p y y y

Construction Vertically stacked for efficient light coupling

Laterally stackedCMOS integrated capacitors

Laterally stackedMEMS process for transformer coils

Laterally stackedSpecial process for magneto-resistive structure

CI-O pF range fF to pF range pF range pF range

CouplingMechanism

Technique Optical E-field B-field B-field

Input circuit LED CMOS CMOS + coil CMOS + coilInput circuit LED CMOS CMOS + coil structure

CMOS + coil structure

Output circuit Photo-transistor, diode, triacs

CMOS CMOS + coil structure

CMOS + magneto-resistive structurestructure

12

Inside an Opto-coupler

IN OUTLight pathPhoto

D t t

Clear InsulatingShieldOutput Die

GND

Insulating film or dielectric

DetectorLED

LED

Isolation Barrier – Mold compoundOrganic, less stable over temperature, humidityLow quality dielectric – higher defects, breakdown is 50V/μmBottom line: Intrinsic reliability is lower than SiO2, but may compensate due to “more thickness”

Coupling Technique Optical on Ga As type processCoupling Technique – Optical on Ga-As type processLED switching causes• Low switching frequencies, higher latency, higher skew/jitter• Photon efficiency degrades with time, temperaturePhoton efficiency degrades with time, temperature • Very difficult to fit multiple channels in small package (shielding)• No antennae (coils) - very low emissions, high immunity• Immune to data errors & intrinsic high noise rejection but low immunity to

transients may cause false switching

13

transients – may cause false switchingGa-As technology• Not amenable to SoC type integration

Inside a Magnetic Coupler

EN

CO

DE

R

DE

CO

DER

E

R

Isolation Barrier – Polyimide (PI)Organic, highly permeable to moistureLower quality dielectric – breakdown is 250V/μmBottom line: Lower intrinsic reliability

Coupling Technique – Magnetic on CMOS substrate and MEMSMiniature transformer coils cause

R l ti l f t it hi l l t l k /jitt• Relatively fast switching, low latency, low skew/jitter• Lower channel density: 3 die MCM• Higher emissions and lower immunity• Output does not unconditionally follows input, data errors possible due to edge detection and latched architecturep y p , p g

CMOS + MEMS technology• Not amenable to SoC type integration

14

Inside a Capacitive Isolator (Si8xxx)

Isolation Barrier – Silicon-Dioxide (SiO2)Inorganic, stable over temperature, humidity, high quality dielectric – low defects, breakdown is 500V/μmArchitecture uses 2 smalldifferential pairs per channel electric field is reducedArchitecture uses 2 smalldifferential pairs per channel, electric field is reducedBottom line: High Reliability

Coupling Technique – Capacitive on 0.25μm process technologySmall & 2 differential capacitors per isolation channel• Fast switching, low latency, low skew/jitter• Up to 6 channels in 16 pin SOIC narrow body• No antennae (coils) - very low emissions, high immunityFully differential, RF ON/OFF Key (OOK) modulation technology• Output unconditionally follows input when device is powered • Highly immune to data errors compared to edge detection and latched architecture• High noise rejection due to differential methodCMOS technology

15

CMOS technology• Allows integration with MCU’s, high performance ADC’s, Interface (USB, CAN, RS-485)

What Specifications Concern Customers?

Isolation voltageMaximum voltage across isolator;

OUTIN

Impacts system’s safety

Common mode transient ISOLATOR

GND1 GND2

VCM

immunityImmunity to transients;Impacts Error-free data transmission

Prop delay across isolatorSpeed across isolator;

VDDIDD

Speed across isolator; Impacts loop stability & response in control applications

ISOLATOR

OUTIN

VDD

Supply currentPower consumption; I t t ffi i

16

GND1 GND2Impacts system power efficiency

Summary

Galvanic isolation “insulates” sections of electrical circuits to prevent current flow between the sections, but maintains the ability to exchange energy or information between the sections.

The most common isolation uses are:Safety Isolation: isolate potentially lethal voltage from low voltage groundSignal Level Shift: match signal amplitude and common mode voltage levelsSignal Level Shift: match signal amplitude and common mode voltage levels Ground Noise Reduction: isolate high noise grounds from noise-sensitive circuits

Safety is regulated by international safety standard test methods and y g y yguidelines.

Component and system level safety certifications are performed by regulating agencies• The most common system standard specifications are 61010 (Test and Measurement), 60950

(Telecom), and 60601 (Medical)

The certification engineer decides which standard (i.e. system or component) to use for qualification.p ) q

System design engineer is responsible for the proper creepage and clearance distances

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Agenda1. Isolation 101

2. Silicon Labs isolator product introduction2.1 Si84xx/86xx/87xx Product Portfolio2.2 Support Resource

3. Isolator Product Application

18

Digital Isolation Product Portfolio

• Certified UL, CSA, VDE (up to 2.5kV)• Low EMISi84xx• High timing accuracy• Very high reliability• Best for: isolating data

SMPS, Telecom, White Goods,

General Purpose

• Si84xx isolation performance PLUS:• Reinforced (60950-1) and medical (IEC

60601-1)U t 5kV i l ti

Si86xxIndustrial, Medical • Up to 5kVrms isolation

• Improved noise tolerance• Best for: isolating data

Medical, Automotive,

Solar

• Si86xx safety performance PLUS:• Reinforced VDE/IEC (10kV surge)• Drop-in upgrades for popular optocouplers

B t f hi h f t d (l

Si87xx Industrial, Medical,

• Best for: high-performance opto upgrade (long life, high reliability and data rates)

General Purpose

19

Si84/86xx Isolator Family

1 – 6 Channel Digital Isolatorsan

nels

vers

eC

hpo

rts R

ev I2C Isolators

Sup

p

Si84xx support 1, 150 Mbps & 1, 2.5 & 5kV (5kV for 1,2 channels only)Si86xx support 150 Mbps for 3.75, 5 kV rating.

20

Silicon Labs Isolators – A broad family for a variety of needs

Si86xx Digital Isolator Enhancements

Lower frequency oscillators for lower power operation and even lower EMI

Up to 6 isolation channels rated at

Tighter receiver band pass for improved CMTI: 35kV/uS(min), 50kV/uS(typ) 

even lower EMI channels rated at 5kVRMS

Improved regulator for 40x higher PSRR

Faster output buffer with exactly 50 ohm output termination for tighter output impedance

oror

OSCVREG OSC VREG

output impedance matching

Si86xx Isolator Channel

Isolato

Tx

Isolato

Rx  BUFINPUT OUTPUT

Schmitt trigger input for higher input noisehigher input noise rejection.  Higher ESD rating: 8kV (HBM)

Minimum operating VDD = 2.5V

Robust ESD clamp on I/O’s

5kV isolation, improved noise rejection, industry-leading CMTI, higher ESD!

VDD   2.5V

21

, p j , y g , g

Si86xx Achieves Higher Slew Rates

Si84xx

VDD

R

RC 1

T i R t 2 V/

C

RC = 1μs

Trigger Rate = 2 V/μsGND

VDDR

Si86xxC

RC = 40ns

Resd

Trigger Rate = 50 V/μs

S ESD t ti 25 d d iti it t VDD i

GND

Resd

22

Same ESD protection, 25x reduced sensitivity to VDD noise

Si87xx Opto-isolator Replacement Family

Pin-compatible with digital open collector optosNote: No reverse bias of LED emulator No pin compatibility with 4 pin optos

3.75 and 5 kV reinforced isolation ratingsVDE reinforced – 10kV surgeUL, CSA

Performance and reliability advantages vs. optosResistant to temperature, age and forward current effects10X lower FIT rate for longer service lifeHigher Transient Immunity: >50 kV/μs typicalLower power and forward input diode current

Wide range of product optionsWide range of product optionsLow power or higher performanceSmall package (4mm) to extra wide (10mm)Integrated pull-up, Output enable

ApplicationsIndustrial automation, PLC Motor controls and drives

23

Isolated switch mode power suppliesIsolated data acquisitionTest & measurement equipment

Si87xx Opto-isolator Replacement Overview

Si8710xD-A-IS isolatorsLow power (A) or high performance (B) options

A: 3mA input, 1MbpsB: 6mA input, 15Mbps

Wide SO-6 package5kVrms isolation5kVrms isolation10kV surge rating!

Si8710xx-A-IS isolatorsLow power (A) or high performance (B) options( ) p

A: 3mA input, 1MbpsB: 6mA input, 15Mbps

SO-8, LGA-8, PDIP/GW-8 packages3.75kV & 5kV isolation10kV surge rating

24

Si87xx Opto-isolator Replacement Overview

Si8711xx-A-IS isolatorsOutput pull-up integrated (20k)p p p g ( )SO-8, LGA-8, PDIP/GW-8 packages

3.75kV & 5kV isolation 10kV surge rating!

Low power and high performance options

Si8712xx-A-IS isolatorsOutput enable (VE)Output enable (VE)SO-8, LGA-8, PDIP/GW-8 packages

3.75kV & 5kV isolation10kV surge rating

Low power and high performance options

25

Si84/6/7xx Comparison

Feature Si84xx Si86xx Si87xx

VDD max 6V 7V 30V

VDD transient tolerance 2 V/µs 50 V/µs 50 V/us

Output current 10mA 22mA

Schmitt trigger inputs No Yes N/A

CMTI 25 kV/µs 35 kV/µs 30 KV/us

VDD min 2.7V 2.5V 3.0V

EMI Best in class 5 dB better

2 5kVIsolation rating

2.5kV(5kV for 1,2 ch only)

3.75kV & 5kV 3.75kV, 5kV

PackagesSO-8 (NB)SO-16 (NB & WB)

SO-8 (NB)SO-16 (NB, WB)

SO-8 (NB)SO-6 (wide)DIP 8 (GW)

g ( )QSOP-16

( , )QSOP-16

DIP-8 (GW)LGA-8 (extra wide)

Cross partsp

Silicon Labs’ broad isolator portfolio insures that the right d i i il bl f li ti !

26

device is available for any application!

Turnkey Tools Get You Started TodayE al ation kits streamline testing directl in o r s stemEvaluation kits streamline testing directly in your system

Si84xxISO-KIT• Quick evaluation of 6

Si86xxISO-KIT• Quick evaluation of 6

Si82xx-KIT• Quick evaluation of 4Quick evaluation of 6

different isolators from the Si84xx family

different isolators from the Si86xx family

Quick evaluation of 4 different isolated drivers from the Si82xx family

Reference designs explore new applicationsSi86ISOLIN-KIT ISOVOLT35-KIT SI890xPWR-KIT

• Three cost/performance optimized analog isolation circuits

• Isolated DC/DC converter and isolated digital channels

• Isolated power line monitoring with analog or digital output

isolation circuits

27

And more… http://www.silabs.com/products/power/isolators/Pages/DevelopmentTools.aspx

Isolator Product SupportData sheets are j st the beginning of hat’s a ailable onlineData sheets are just the beginning of what’s available online

Tools to locate the right part, get designed in, and debug available 24/7Comprehensive knowledge base of common issues

Access to Silicon Labs’ world class application support teamAccess to Silicon Labs world-class application support team

Web Tools Application Notes• Isolator Knowledge Base• Parametric Search• Technical Support

pp• AN375: Isolated I2C Design • AN634: Power Supply

Considerations pp• Competitor Cross Reference • AN583: Safety Considerations

and Layout Recommendations

White Papers• RF Isolators Supersede

Optocouplers

User’s Guides• Discrete Isolated DC-DC

Converter Reference DesignOptocouplers• CMOS Advanced Isolators for

Medical Electronics• Low EMI Isolation for Medical

Converter Reference Design• Si86xxISO EVB• Si86xx IsoLinear

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Equipment Applications

Agenda1. Isolation 101

2. Silicon Labs isolator product introduction

3. Isolator Product Application3.1 Data Acquisition3.2 Bus Isolation3.3 Diagnostics and Imaging3 4 Solar Inverters & Smart Power Systems3.4 Solar Inverters & Smart Power Systems3.5 Hybrid Electric Vehicles (HEV)3.6 Battery Management System (BMS)3 7 Th Ph M it3.7 Three-Phase Monitor

29

Key Target Applications & Challenges

• Reliability• Low EMI, high immunity

INDUSTRIALFactory Automation

C &, g y

• Tight timing specs• Safety certification

Motor Control & DrivesMedical

Security/HVAC

• Reliability• High voltage withstand

GREEN ENERGYS l (PV) I t High voltage withstand

• Extended temperature range• High Integration

Solar (PV) InvertersSMPSUPS

• Low EMI• ReliabilityAUTOMOTIVE Reliability• Extended temperature range• Safety certification• Pin compatibility

EV/ HEV Battery ControlChargers

CAN Bus isolation

30

• Pin compatibility

Data Acquisition

Isolating an A/D converter output from its input provides significant benefits

P t t l lt i it

Isolated Serial ADC

Protects low voltage circuitryEliminates noisy ground loopsReduces the impact of common mode noise Isolated Serial ADCReduces the effect of high voltage transientsBridges incompatibilities in interface voltage levels 3.5

Electric Field Immunity Comparison with Competitionvoltage levels

Products to targetDigital isolatorsF t I ADC C t 2 0

2.5

3.0

3.5

e (V

)

Future: Iso-ADC, Current sensors

Why We WinReliability

0 5

1.0

1.5

2.0

Out

put v

olta

ge

FailPass

Low EMI, high immunity Tight timing specsSafety certification

-0.5

0.0

0.5

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

31

RF Field Frequency (MHz)

Bus Isolation

Industrial Buses form the network between sensors & actuators to controllers

5-10W VDD1:

High Power Brick

Low power IsolatedVDD2

RS-485 or CAN based

Products to targetDigital isolators

Si8xxxDigital Isolator XCVR

CPU

Sensor inputs

PressureTemp.Flow

Digital isolatorsFuture: IsoVolt

3V/5V Digital Domain Isolated Field Side

Why We WinReliability, High Voltage LifetimeLow EMI, high immunity Tight timing specsSafety certification

32

Silicon Labs

Competitor1

competitor2

E-Model Lifetime

60 years < 10 years 28 years

Diagnostics and Imaging

Medical electronics is integral part of clinical procedures

Safety & reliability are key due to liability & long product lifetimeliability & long product lifetimeProduct certification and compliance to IEC 60601-1 is keyLow EMI is key performance metric for sensitive circuit components

Products to targetDigital isolatorsFuture: IsoVolt

Why We WinReliabilityLow EMI high immunity

> 15 dB higher emissions > 20 dB higher emissions

Low EMI, high immunity Safety certification

Com

petit

or 1

(T)

Com

petit

or 2

(A)

33

Solar Inverters & Smart Power SystemsS l P I tSolar Power InverterAC

AppliancesSolar Panels

Inverter

ChCharge controller

Customer challengesMeet 25 year system lifetimeMaximize efficiency

Why Si8xxx winsSuperior MTTF vs. optosISOdrivers: Adjustable dead time

34

Maximize efficiencyCompatibility w/ 240 VAC

ISOdrivers: Adjustable dead time 5 kV isolation ratings

Hybrid Electric Vehicles (HEV)Hybrid Electric Vehicles utilize a battery system that works with an Electric Motor Drive System to power an automobile

Silicon Labs’ isolation solutions provide higher levels of integration and performance stability compared to digital optocouplers and opto + gate driver solutionsp g p p p g

Critical need is higher working voltages (upto 1000VDC) reliability, AECQ100 qual, PPAP support

High Voltage Electronic Control Unit (HVECU)

Digital Isolators (CAN Bus)

A/C ElectricA/C

Analog and/or Digital Isolators

(V, I Data)

Digital Isolators

(CAN Bus)ECM

(Engine Control Module)

Analog and/or Digital Isolators(Temperature)

ISO

ISOISO

Digital Isolators or ISOdrivers

(IGBT Gate Drive)

(CAN Bus)

ISO A/C Electric Inverter

CompressorInverter

A/C Inverter

ISO

Digital or Analog Isolators

(Control Loop)

Digital or Analog Isolators

(V,I Data) MG1Temp Sensor

Temp Sensor

ISO

ISO

ISO

ISO

ISO

Boost Converter

Inverter Assembly

DC/DC Converter

AuxBattery

Digital Isolators or ISOdrivers

(IGBT Gate Drive)

Digital and/or Analog Isolators (Batt V, I Data)

Digital Isolators (CAN Bus)

CurrentAnalog Isolator (Current Signal)

Digital Isolators (Control Interface)

DRIVE TRAIN

Engine MG2

Front Wheels

Transaxle

ISO

35

Battery ECU

ISOISOCurrent SensorISO

(Current Signal)

HV Battery

ISO Analog Isolator (Voltage Signal)

DRIVE TRAINISO

Battery Management System (BMS)

BMS is critical for Li batteries used in EV/HEV to

Maintain the battery, protect the ll d l b tt lifcells and prolong battery life

Isolation needed between cells and to vehicle control system (CAN bus)

Products to targetDigital isolators (Si86xx)Isolated gate driversIsolated gate drivers

Why we winLow EMIReliability & safetyC t t ti t tCustom automotive type supportPin compatibility

> 15 dB higher emissions > 20 dB higher emissions

etito

r 1(T

)

titor

2(A

)

36

Com

pe

Com

pet

SMPS

PRIMARY POWER STAGES

SECONDARY POWER STAGES

Switched mode power supplies are ubiquitous, provide higher efficiencies

ServersCONTROLLER DRIVERServers

UPSIndustrial inverters

ISODRIVER

DRIVERProducts to target

Digital isolators (Si86xx)Isolated gate driversIsolated gate driversCurrent sensorsIsolated ADCs

IsoDriver Feature BENEFITTwo-wire or PWM input versions Connects directly to controllers of all types

Why we winHighest Feature IntegrationLow latency

Two-wire or PWM input versions Connects directly to controllers of all types

Programmable dead time control Allows user to “tune” system for peak efficiency

Overlap protection Higher efficiency, greater safety

DISABLE input Facilitates local ON/OFF control/protectionLow latencyHigh noise immunity

Input & output UVLO Glitch-free start-up/shutdown

Fast propagation timing More timing margin and/or faster control loop response

1500 VDC isolation (out/out) Wide application range

37

Three-Phase AC Line Monitor Solutions

Very high power applications are powered by three-phase AC lines.

E l d li ti hi h tExample end applications: high power motor control, machine automationThree-phase line monitoring is widely used to

t t l d d t tprotect personnel and down-stream systemsEach of the three phases must be monitored separately

Silicon Labs isolation can be use to solve a wide range of customer problems, including three phase AC line monitoringincluding three-phase AC line monitoring

The following application diagrams show how to implement low cost and reliable isolated three-

h it l ti i th Si87phase monitor solutions using the Si87xx, Si84xx/Si86xx

38

Low Cost AC Line Monitor Using Si87xx

AC

RLIM 1

Si87xx OptoPro Isolator

OPT

OEM

ULA

TOR

ISO

LATI

ON

Receiver BUFFER

AC Phase A

AC AC

Si87xx OptoPro Isolator

TO ATO

R

ATI

ON

Receiver

RLIM 2

AC Phase C

AC Phase B

BUFFER Sig

nals

OPT

EMU

LA

ISO

LA

Receiver BUFFER

Isol

ated

Out

put S

Si87xx OptoPro Isolator

OPT

OEM

ULA

TOR

ISO

LATI

ON

Receiver

RLIM 3BUFFER

Output Signals

Only one phase is shown

This example uses the Si87xx to sense each phaseThe output signal is centered within the incoming AC mains waveform

Th b fi i li i l l d

39

The benefits are simplicity, low-cost, lowest component count and high reliability

Three-Phase Monitor Using Si84xx/Si86xx

put S

igna

lsIs

olat

ed O

utp

This example uses a 3 channel isolator to sense all phasesOperating performance is similar to the low cost monitor shown earlier

The benefits are integrated isolation and high reliability

40

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