Datasheet ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474 (Analog Devices)

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PWM Controller and Transformer Driver with Quad-Channel Isolators Data Sheet ADuM3470/ ADuM3471/ ADuM3472/ ADuM3473/ ADuM3474 FEATURES FUNCTIONAL BLOCK DIAGRAMS Isolated PWM controller T1 V V DD1 RECT ISO Integrated transformer driver Regulated adjustable output: 3.3 V to 24 V VREG X1 X2 2 W output power ADuM3470/ADuM3471/ ADuM3472/ADuM3473/ 70% efficiency at guaranteed load of 400 mA at 5.0 V output ADuM3474 VDD2 VDDA DRIVER REG Quad dc-to-25 Mbps (NRZ) signal isolation channels FB 5V PRIMARY 20-lead SSOP package CONVERTER SECONDARY FB CONTROLLER High temperature operation: 105°C maximum OC CH A High common-mode transient immunity: >25 kV/µs 200 kHz to 1 MHz adjustable oscillator frequency CH B VIA/VOA VIA/VOA PRIMARY SECONDARY Soft start function at power-up DATA DATA I/O I/O VIB/VOB CH C VIB/VOB Pulse-by-pulse overcurrent protection 4CH 4CH Thermal shutdown VIC/VOC VIC/VOC CH D Safety and regulatory approvals VID/VOD VID/VOD
001
UL recognition: 2500 V rms for 1 minute per UL 1577 GND1 GND2
09369-
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 VIORM = 560 V peak 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/ ADuM3474 devices1 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 smal form factor, total isolation solution. The ADuM347x isolators provide four independent isolation channels in a variety of 003 channel configurations and data rates (see the Ordering Guide). 09369- 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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Document Outline Features Applications General Description Functional Block Diagrams Table of Contents Revision History Specifications Electrical Characterstics—5 V Primary Input Supply/5 V Secondary Isolated Supply Electrical Characteristics—3.3 V Primary Input Supply/3.3 V Secondary Isolated Supply Electrical Characteristics—5 V Primary Input Supply/3.3 V Secondary Isolated Supply Electrical Characteristics—5 V Primary Input Supply/15 V Secondary Isolated Supply Package Characteristics Regulatory Approvals Insulation and Safety-Related Specifications DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation Characteristics Recommended Operating Conditions Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Terminology Applications Information Application Schematics Transformer Design Transformer Turns Ratio Transformer ET Constant Transformer Primary Inductance and Resistance Transformer Isolation Voltage Switching Frequency Transient Response Component Selection Printed Circuit Board (PCB) Layout Thermal Analysis Propagation Delay-Related Parameters DC Correctness and Magnetic Field Immunity Power Consumption Power Considerations Soft Start Mode and Current-Limit Protection Data Channel Power Cycle Insulation Lifetime Outline Dimensions Ordering Guide Automotive Products