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Linear Isolators with Analog Devices iCoupler Technology
The ADuM3190/4190 are new linear isolators from Analog Devices that provide isolated error amplification for primary side control of power supplies. Compared to existing solutions using optocouplers and shunt regulators, the ADuM3190/4190 offer 10x wider bandwidth, 65% lower power consumption, 25% smaller size, and extended operating temperature up to 125°C while reducing cost by up to 25%. The ADuM3190/4190 enable power supply designs to achieve the high performance of secondary side control with the low cost benefits of primary side control.
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Linear Isolators with Analog Devices iCoupler Technology
- 1. The World Leaderin High Performance Signal Processing Solutions Introducing ADuM3190/4190 Linear Isolators Based on iCoupler® Digital Isolator Technology February 2013
- 2. ADuM3190/4190: Industry’s First Integrated,Isolated Linear Error Amplifiers Ideal for cost-sensitive primary side control power supplies striving for the performance of secondary side control Replaces optocouplers and shunt regulators by using iCoupler isolation technology Reduces cost by up to 25% Reduces size by up to 25% Saves power consumption by up to 65% Increases performance with 10x wider bandwidth Extends usability with operating temperature up to 125°C Improves reliability with standard, foundry CMOS 2
- 3. Existing Primary SideControllers Use Optocouplers and Shunt Regulators Limit Performance (Bandwidth & Transient Response) 25 kHz maximum loop bandwidth limits transient response Consume Excess Power 100mW loss from LED – 20mA at 5V More current improves performance but hurts efficiency Use Multiple ICs and Consume Area Slow switching speed requires large size of Lout and Cout Limit Operating Temperature Typical limit is 85°C ADuM3190/4190 Pose Reliability Challenges Replaces These CTR uncertainty requires over compensation – slowing down the loop Components 3
- 4. ADuM3190/4190 iCoupler AlternativeImproves Primary Side Control Solutions Increases Performance (Bandwidth & Transient Response) 250 kHz bandwidth (10x wider) improves transient response Saves Power Only 35mW vs. 100mW for optocouplers No need to increase power to improve performance Reduces Components and Area Consumes 25% less board space Integrates regulator Extends Operating Temperature Range Qualified for 125°C operation 5 mm Improves Reliability No CTR uncertainty to contend with 4 mm 4
- 5. ADuM3190/4190 Features andSpecifications For Use as an Isolated Error Amplifier for Power Supply Feedback Specifications Features Total Accuracy Voltage or Current Output 1% TMIN to TMAX 1.225V Reference -40C to 125C TA DOSA compatible -3dB bandwidth 400kHz Integrator or DC Gain Wide Voltage Range UVLO VDD1 and VDD2 - 3V to 20V ADuM3190 2.5kV rms Isolation Rating ADuM4190 5kV rms Isolation Rating 5
- 6. Designers No LongerHave To Choose Between Primary & Secondary Side Control Optocoupler Solution ADuM3190/4190 Choose Between Achieve Both Performance and Cost Performance and Cost High Low Performance High OR Cost Performance AND Low Cost Secondary Side Primary Side Primary Side Control Control Control with ADuM3190/4190 ADuM3190/4190 enables fast transient response performance of secondary side control with the low cost of primary side control 6
- 7. Application Example: Analog Primary-sideControl Isolated Error Amplifier with the Same Functionality and Better Performance than Traditional Optocoupler and Shunt Regulator Solutions VOSC PWM Controller Supports VOUT from 1V to 48V Compliant to DOSA Trim Standard Output BW 400kHz for Op Amp with fast loop Reference 1% 10MHz Gain BW response stability over enables high switching temperature and frequency of time for high DC/DC converter accuracy DC/DC output 7
- 8. ADuM3190/4190 DOSA CompliantConfiguration DOSA Module VOUT Rset1 Rtrim-up l VIN= 0.35 to 1.5V Rset2 + Optional trim up or trim down R3 resistor by +/-10% of nominal Error Amp value according to DOSA R5 R4 Vref Rtrim-down 1.225V R6 ADuM3190 Module nominal output R3 R4 R5 R6 VOUT > 1.5V 1k 1k 0 ∞ VOUT < 1.5V 1k 0 2.05k 1.96k VOUT > 1.5V 5.11k 5.11k 0 ∞ VOUT < 1.5V 5.11k 0 10.5k 10.0k 8
- 9. Application Example: Isolated VoltageFeedback for Digital Controllers Digital Controller ADC 9
- 10. ADuM3190/4190 vs. OptocouplerSolution Optocoupler Shunt ADuM3190/4190 Regulator Solution Solution Max Bandwidth 25 kHz 400 kHz Accuracy (Maximum @ 125°C TA) Not Guaranteed 1% Max Current Consumption 20mA 7mA Number of ICs 2 1 Operating Ambient Temperature Range -40 to +85°C -40 to +125°C CTR Degradation with time, temperature and current 75% No CTR! 10
- 11. ADuM3190 / ADuM4190Options Isolation Rating Max. Ambient Temp. Typical Bandwidth 1K resale 2.5 kV rms 5 kV rms 85°C 125°C 200 kHz 400 kHz USD ADuM3190ARQZ $1.04 ADuM3190BRQZ $1.12 ADuM3190SRQZ $1.14 ADUM3190TRQZ $1.23 ADuM4190ARIZ $1.20 ADuM4190BRIZ $1.28 ADuM4190SRIZ $1.30 ADuM4190TRIZ $1.39 Evaluation Board also available: EVAL-ADUM3190EBZ - $49USD Supports the function of ADuM3190 and ADuM4190 11
- 12. Learn More AboutiCoupler Digital Isolators www.analog.com/iCoupler Resources Include: Webcast and Training videos Interface and Isolation Newsletter Archives and Subscription Link Circuits from the Lab™ Application Notes Technical Articles Digital Isolator Product Selector Guide Regulatory Agency Certifications Datasheets Evaluation Boards And Much More!