PWM Controller and Transformer
Driver with Quad-Channel Isolators
Data Sheet
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
FEATURES FUNCTIONAL BLOCK DIAGRAMS
T1
Isolated PWM controller
V RECT V
DD1 ISO
Integrated transformer driver
V
REG
X1 X2
Regulated adjustable output: 3.3 V to 24 V
ADuM3470/ADuM3471/
2 W output power
ADuM3472/ADuM3473/
V
70% efficiency at guaranteed load of 400 mA at 5.0 V output ADuM3474 DD2
V DRIVER
DDA REG
Quad dc-to-25 Mbps (NRZ) signal isolation channels 5V
FB
PRIMARY
SECONDARY FB
CONVERTER
20-lead SSOP package
CONTROLLER
OC
High temperature operation: 105C maximum
CH A
High common-mode transient immunity: >25 kV/s
CH B
200 kHz to 1 MHz adjustable oscillator frequency V /V V /V
IA OA IA OA
PRIMARY SECONDARY
DATA DATA
Soft start function at power-up
I/O I/O
V /V CH C V /V
IB OB IB OB
4CH 4CH
Pulse-by-pulse overcurrent protection
V /V V /V
IC OC IC OC
CH D
Thermal shutdown
V /V V /V
ID OD ID OD
Safety and regulatory approvals
GND GND
1 2
UL recognition: 2500 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
Figure 1. Functional Block Diagram
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 ADuM3470 ADuM3471
V = 560 V peak
IORM
Qualified for automotive applications
APPLICATIONS
RS-232/RS-422/RS-485 transceivers
Industrial field bus isolation
Power supply start-up bias and gate drives
Isolated sensor interfaces
Process controls
ADuM3472
Automotive
GENERAL DESCRIPTION
The ADuM3470/ADuM3471/ADuM3472/ADuM3473/
1
ADuM3474 devices are quad-channel digital isolators with an
integrated PWM controller and transformer driver for an isolated
dc-to-dc converter. Based on the Analog Devices, Inc., iCoupler
technology, the dc-to-dc converter provides up to 2 W of regulated,
isolated power at 3.3 V to 24 V from a 5.0 V input supply or from
ADuM3473 ADuM3474
a 3.3 V supply. This eliminates the need for a separate, isolated
dc-to-dc converter in 2 W isolated designs. The iCoupler chip scale
transformer technology is used to isolate the logic signals, and the
integrated transformer driver with isolated secondary side control
provides higher efficiency for the isolated dc-to-dc converter. The
result is a small form factor, total isolation solution. The ADuM347x
isolators provide four independent isolation channels in a variety of
channel configurations and data rates (see the Ordering Guide).
Figure 2. Block Diagrams of I/O Channels
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
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09369-003
09369-001ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Typical Performance Characteristics ........................................... 19
Applications ....................................................................................... 1 Terminology .................................................................................... 24
General Description ......................................................................... 1 Applications Information .............................................................. 25
Functional Block Diagrams ............................................................. 1 Application Schematics ............................................................. 25
Revision History ............................................................................... 2 Transformer Design ................................................................... 26
Specifications ..................................................................................... 3 Transformer Turns Ratio ........................................................... 26
Electrical Characteristics5 V Primary Input Supply/ Transformer ET Constant ......................................................... 27
5 V Secondary Isolated Supply ................................................... 3
Transformer Primary Inductance and Resistance ................. 27
Electrical Characteristics3.3 V Primary Input Supply/
Transformer Isolation Voltage .................................................. 27
3.3 V Secondary Isolated Supply ................................................ 5
Switching Frequency .................................................................. 27
Electrical Characteristics5 V Primary Input Supply/
Transient Response .................................................................... 27
3.3 V Secondary Isolated Supply ................................................ 7
Component Selection ................................................................ 27
Electrical Characteristics5 V Primary Input Supply/
15 V Secondary Isolated Supply ................................................. 9 Printed Circuit Board (PCB) Layout ....................................... 28
Package Characteristics ............................................................. 11 Thermal Analysis ....................................................................... 28
Regulatory Approvals ................................................................. 11 Propagation Delay-Related Parameters ................................... 28
DC Correctness and Magnetic Field Immunity ..................... 29
Insulation and Safety-Related Specifications .......................... 11
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Power Consumption .................................................................. 30
Insulation Characteristics .......................................................... 12
Power Considerations ................................................................ 30
Recommended Operating Conditions .................................... 12
Insulation Lifetime ..................................................................... 31
Absolute Maximum Ratings .......................................................... 13
Outline Dimensions ....................................................................... 32
ESD Caution ................................................................................ 13
Ordering Guide .......................................................................... 33
Pin Configurations and Function Descriptions ......................... 14
Automotive Products ................................................................. 33
REVISION HISTORY
5/14Rev. A to Rev. B Changes to Figure 6 and Table 14................................................. 16
Change to Table 4 ............................................................................. 9 Changes to Figure 7 and Table 15................................................. 17
Changes to Figure 8, Table 16, and Table 17 ............................... 18
7/13Rev. 0 to Rev. A Change to Figure 9 ......................................................................... 19
Changed VDD1 Pin to NC Pin ....................................... Throughout Changes to Terminology Section ................................................. 24
Changes to Features Section, Applications Section, Changes to Applications Information Section, Application
General Description Section, and Figure 1 ................................... 1 Schematics Section, Figure 38, Figure 39, and Figure 40 .......... 25
Created Hyperlink for Safety and Regulatory Approvals Changes to Transformer Turns Ratio Section ............................ 26
Entry in Features Section ................................................................. 1 Changes to Transformer ET Constant Section,
Changes to Table 1 ............................................................................ 3 Transient Response Section, and Table 19 .................................. 27
Changes to Figure 41 ...................................................................... 28
Changes to Table 2 ............................................................................ 5
Changes to Table 3 ............................................................................ 7 Changes to Power Consumption Section and Figure 45 ........... 30
Changes to Table 4 ............................................................................ 9 Changes to Insulation Lifetime Section and Figure 48 ............. 31
Changes to Regulatory Approvals Section .................................. 11 Changes to Ordering Guide .......................................................... 33
Changes to Figure 3 and Table 9 ................................................... 12 Added Automotive Products Section .......................................... 33
Changes to Figure 4 and Table 12 ................................................. 14
Changes to Figure 5 and Table 13 ................................................. 15 10/10Revision 0: Initial Version
Rev. B | Page 2 of 36