Datasheet ADUM3070 (Analog Devices)

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Isolated Switching Regulator With Integrated Feedback Data Sheet ADuM3070 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 with 5 V input voltage X1 X2 VREG Regulated adjustable output: 3.3 V to 24 V ADuM3070 Up to 80% efficiency VDD2 REG 200 kHz to 1 MHz adjustable oscillator PRIMARY 5V V CONVERTER/ DDA Soft start function at power-up DRIVER SECONDARY FB CONTROLLER Pulse-by-pulse overcurrent protection INTERNAL OC FEEDBACK Thermal shutdown GND1 GND2 2500 V rms isolation High common-mode transient immunity: >25 kV/µs NOTES
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1. VDD1 IS THE POWER SUPPLY FOR THE PUSH-PULL TRANSFORMER. 16-lead QSOP package 2. VDDA IS THE POWER SUPPLY OF SIDE 1 OF THE ADuM3070.
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High temperature operation: 105°C
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APPLICATIONS Power supply startup bias and gate drives Isolated sensor interfaces Process controls GENERAL DESCRIPTION
The ADuM30701 isolator is a regulated dc-to-dc isolated power The ADuM3070 isolator provides a more stable output voltage and supply controller with an internal MOSFET driver. The dc-to- higher efficiency compared to unregulated isolated dc-to-dc power dc controller has an internal isolated PWM feedback from the supplies. The fully integrated feedback and loop compensation secondary side based on the iCoupler® chip scale transformer in a smal QSOP package provides a smal er form factor than any technology and complete loop compensation. This eliminates discrete solution. The regulated feedback provides a relatively flat the need to use an optocoupler for feedback and compensates efficiency curve over the ful output power range. The ADuM3070 the loop for stability. enables a dc-to-dc converter with a 3.3 V to 24 V isolated output voltage range from either a 5.0 V or a 3.3 V input voltage, with an output power of up to 2.5 W. 1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7075 329 B2. Other patents are pending.
Rev. A 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 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 ©2012–2014 Analog Devices, Inc. All 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) 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