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.

1. The World Leader in 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 Side Controllers 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 Alternative Improves
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 and Specifications
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
 -40C to 125C 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 Longer Have 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-side Control
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 Compliant Configuration
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 Voltage Feedback for Digital Controllers
Digital
Controller
ADC
9

10. ADuM3190/4190 vs. Optocoupler Solution
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 / ADuM4190 Options
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 About iCoupler 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!