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. Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20102014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 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. 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