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GRM32ER71A476KE15L

更新时间： 2024-11-23 07:18:43
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亚德诺 - ADI 稳压器开关
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20页 713K
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Isolated Switching Regulator

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Isolated Switching Regulator  
With Integrated Feedback  
Data Sheet  
ADuM3070  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
V
V
ISO  
DD1  
Isolated PWM feedback with built in compensation  
Primary side transformer driver for up to 2.5 W output power  
with 5 V input voltage  
RECT  
X1  
X2  
V
REG  
ADuM3070  
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  
V
DD2  
REG  
5V  
PRIMARY  
CONVERTER/  
DRIVER  
V
DDA  
SECONDARY  
CONTROLLER  
FB  
INTERNAL  
FEEDBACK  
OC  
GND  
GND  
2
1
2500 V rms isolation  
High common-mode transient immunity: >25 kV/µs  
16-lead QSOP package  
NOTES  
1. V  
2. V  
IS THE POWER SUPPLY FOR THE PUSH-PULL TRANSFORMER.  
IS THE POWER SUPPLY OF SIDE 1 OF THE ADuM3070.  
DD1  
DDA  
Figure 1.  
High temperature operation: 105°C  
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  
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.  
Rev. 0  
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  
rightsof third parties that may result fromits use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2012 Analog Devices, Inc. All rights reserved.  
 
 
 
 
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