Datasheet ADuM4470, ADuM4471, ADuM4472, ADuM4473, ADuM4474 (Analog Devices)

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Isolated Switching Regulator with Quad-Channel Isolators Data Sheet ADuM4470/ ADuM4471/ ADuM4472/ ADuM4473/ ADuM4474 FEATURES FUNCTIONAL BLOCK DIAGRAM Isolated PWM feedback with built in compensation V V DD1 ISO RECT Primary side transformer driver for up to 2.5 W output power VREG with 5 V input voltage ADuM4470/ Regulated adjustable output: 3.3 V to 24 V ADuM4471/ ADuM4472/ Up to 80% efficiency ADuM4473/ VDD2 Quad dc-to-25 Mbps (NRZ) signal isolation channels REG ADuM4474 PRIMARY 5V 200 kHz to 1 MHz adjustable oscillator VDDA CONTROLLER/ DRIVER SECONDARY FB Soft start function at power-up CONTROLLER INTERNAL OC FEEDBACK Pulse-by-pulse overcurrent protection Thermal shutdown I/OA I/OA 5000 V rms isolation CHA I/OB I/OB High common-mode transient immunity: >25 kV/μs PRIMARY SECONDARY DATA I/O CHB DATA I/O 20-lead SOIC package with 8.3 mm creepage 4-CHANNEL 4-CHANNEL I/OC I/OC High temperature operation: 105°C CHC I/OD I/OD APPLICATIONS CHD
1 -00
GND Power supply start-up bias and gate drives 1 GND2
991 10
Isolated sensor interfaces
Figure 1.
Process controls RS-232/RS-422/RS-485 transceivers GENERAL DESCRIPTION
The ADuM4470/ADuM4471/ADuM4472/ADuM4473/ The regulated feedback provides a relatively flat efficiency curve ADuM44741 are quad-channel, digital isolators with a regu- over the full output power range. The ADuM447x enable a dc- lated dc-to-dc isolated power supply controller and an internal to-dc converter with a 3.3 V to 24 V isolated output voltage MOSFET driver. The dc-to-dc controller has an internal isolated range from either a 5.0 V or a 3.3 V input voltage, with an PWM feedback from the secondary side, based on the output power of up to 2.5 W. iCoupler® chip scale transformer technology and complete loop The ADuM447x isolators provide four independent isolation compensation. This eliminates the need to use an optocoupler channels in a variety of channel configurations and data rates. for feedback and compensates the loop for stability. (The x in ADuM447x throughout this data sheet stands for the The ADuM447x isolators provide a more stable output voltage ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474.) and higher efficiency compared to unregulated isolated dc- to-dc power supplies. The fully integrated feedback and loop compensation in a wide-body SOIC package provide a smaller form factor and 8.3 mm creepage distance solution. 1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7075 329 B2. Other patents pending.
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Document Outline Features Applications Functional Block Diagram General Description Revision History Block Diagrams of I/O Channels Specifications Electrical Characteristics—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 (Pending) Insulation and Safety-Related Specifications DIN V VDE V 0884-10 (VDE V 0884-10) Insulation Characteristics Recommended Operating Conditions Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Applications Information Theory of Operation 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