Datasheet ADUM4070 (Analog Devices)

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Isolated Switching Regulator with Integrated Feedback Data Sheet ADuM4070 FEATURES FUNCTIONAL BLOCK DIAGRAM V Isolated PWM feedback with built-in compensation VDD1 ISO RECTIFIER Primary side transformer driver for up to 2.5 W output power V with 5 V input voltage X1 X2 REG Regulated adjustable output: 3.3 V to 24 V ADuM4070 Up to 70% efficiency V 200 kHz to 1 MHz adjustable oscillator DD2 REGULATOR Soft start function at power-up 5V Pulse-by-pulse overcurrent protection PRIMARY VDDA CONTROLLER/ Thermal shutdown SECONDARY FB DRIVER CONTROLLER 5000 V rms isolation INTERNAL OC FEEDBACK High common-mode transient immunity: >25 kV/μs
001
16-lead SOIC package with 8.3 mm creepage GND
61-
1 GND2
104
High temperature operation: 105°C maximum
Figure 1.
Safety and regulatory approvals (pending) UL recognition: 5000 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice #5A VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 VIORM = 849 V peak APPLICATIONS Power supply start-up bias and gate drives Isolated sensor interfaces Process controls GENERAL DESCRIPTION
The ADuM40701 is a regulated dc-to-dc isolated power supply The regulated feedback provides a relatively flat efficiency curve controller with an internal MOSFET driver. The dc-to-dc controller over the full output power range. The ADuM4070 enables a dc-to- has internal isolated PWM feedback from the secondary side based dc converter with a 3.3 V to 24 V isolated output voltage range on the iCoupler® chip scale transformer technology and complete from either a 5.0 V or a 3.3 V input voltage, with an output power loop compensation. This architecture eliminates the need to use of up to 2.5 W. an optocoupler for feedback and compensates the loop for stability. The ADuM4070 isolator provides a more stable output voltage 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 solution with a smaller form factor and 8.3 mm creepage distance. 1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices fo r its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2012 Analog Devices, Inc. Al l rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History 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):2006-12 Insulation Characteristics Recommended Operating Conditions Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics 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 Power Consumption Power Considerations Soft Start Mode and Current-Limit Protection Insulation Lifetime Outline Dimensions Ordering Guide