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ADuM4471ARIZ-RL Datasheet(PDF) 1 Page - Analog Devices |
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ADuM4471ARIZ-RL Datasheet(HTML) 1 Page - Analog Devices |
1 / 36 page Isolated Switching Regulator with Quad-Channel Isolators Data Sheet ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474 Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Isolated PWM feedback with built in compensation Primary side transformer driver for up to 2.5 W output power with 5 V input voltage Regulated adjustable output: 3.3 V to 24 V Up to 80% efficiency Quad dc-to-25 Mbps (NRZ) signal isolation channels 200 kHz to 1 MHz adjustable oscillator Soft start function at power-up Pulse-by-pulse overcurrent protection Thermal shutdown 5000 V rms isolation High common-mode transient immunity: >25 kV/μs 20-lead SOIC package with 8.3 mm creepage High temperature operation: 105°C APPLICATIONS Power supply start-up bias and gate drives Isolated sensor interfaces Process controls RS-232/RS-422/RS-485 transceivers FUNCTIONAL BLOCK DIAGRAM ADuM4470/ ADuM4471/ ADuM4472/ ADuM4473/ ADuM4474 PRIMARY CONTROLLER/ DRIVER SECONDARY CONTROLLER INTERNAL FEEDBACK VDD2 OC FB VREG VDD1 VDDA GND1 GND2 REG RECT 5V VISO CHA CHB CHC CHD SECONDARY DATA I/O 4-CHANNEL PRIMARY DATA I/O 4-CHANNEL I/OA I/OB I/OC I/OD I/OA I/OB I/OC I/OD Figure 1. GENERAL DESCRIPTION The ADuM4470/ADuM4471/ADuM4472/ADuM4473/ ADuM44741 are quad-channel, digital isolators with a regu- lated dc-to-dc isolated power supply controller and an internal MOSFET driver. The dc-to-dc controller has an internal isolated PWM feedback from the secondary side, based on the iCoupler® chip scale transformer technology and complete loop compensation. This eliminates the need to use an optocoupler for feedback and compensates the loop for stability. The ADuM447x isolators provide 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 smaller form factor and 8.3 mm creepage distance solution. The regulated feedback provides a relatively flat efficiency curve over the full output power range. The ADuM447x enable 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. The ADuM447x isolators provide four independent isolation channels in a variety of channel configurations and data rates. (The x in ADuM447x throughout this data sheet stands for the ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474.) 1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7075 329 B2. Other patents pending. |
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