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KA4976-AL Scheda tecnica(PDF) 1 Page - Analog Devices |
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KA4976-AL Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 20 page Isolated Switching Regulator With Integrated Feedback Data Sheet ADuM3070 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved. 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 200 kHz to 1 MHz adjustable oscillator Soft start function at power-up Pulse-by-pulse overcurrent protection Thermal shutdown 2500 V rms isolation High common-mode transient immunity: >25 kV/µs 16-lead QSOP package High temperature operation: 105°C APPLICATIONS Power supply startup bias and gate drives Isolated sensor interfaces Process controls FUNCTIONAL BLOCK DIAGRAM Figure 1. GENERAL DESCRIPTION The ADuM30701 isolator is a regulated dc-to-dc isolated power supply controller with 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 ADuM3070 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 small QSOP package provides a smaller form factor than any discrete solution. The regulated feedback provides a relatively flat efficiency curve over the full output power range. The ADuM3070 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. ADuM3070 PRIMARY CONVERTER/ DRIVER SECONDARY CONTROLLER INTERNAL FEEDBACK VDD2 OC FB VREG VDD1 VISO VDDA X2 X1 GND1 GND2 REG RECT 5V NOTES 1. VDD1 IS THE POWER SUPPLY FOR THE PUSH-PULL TRANSFORMER. 2. VDDA IS THE POWER SUPPLY OF SIDE 1 OF THE ADuM3070. |
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