High Voltage Current Shunt Monitor Data Sheet AD8212 FEATURES FUNCTIONAL BLOCK DIAGRAM V V+ SENSE Adjustable gain 1 8 High common-mode voltage range AD8212 7 V to 65 V typical 7 V to >500 V with external pass transistor Current output Integrated 5 V series regulator 8-lead MSOP package Operating temperature range of 40C to +125C APPLICATIONS Current shunt measurement OUTPUT CURRENT Motor controls COMPENSATION BIAS DC-to-DC converters CIRCUIT Power supplies 5 2 3 6 Battery monitoring I COM BIAS ALPHA OUT Remote sensing Figure 1. GENERAL DESCRIPTION The AD8212 is a high common-mode voltage, current shunt Another feature of the AD8212 is high voltage operation, monitor. It accurately amplifies a small differential input voltage which is achieved by using an external high voltage breakdown in the presence of large common-mode voltages up to 65 V PNP transistor. In this configuration, the common-mode range of the AD8212 is equal to the breakdown of the external PNP (>500 V with an external PNP transistor). transistor. Therefore, operation at several hundred volts is easily The AD8212 is ideal for current monitoring across a shunt achieved (see Figure 23). resistor in applications controlling loads, such as motors and solenoids. The current output of the device is proportional to The AD8212 features a patented output base current compensa- the input differential voltage. The user can select an external tion circuit for high voltage operation mode. This ensures that resistor to set the desired gain. The typical common-mode no base current is lost through the external transistor and voltage range of the AD8212 is 7 V to 65 V. excellent output accuracy is maintained regardless of common- mode voltage or temperature. Rev. C 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20072017 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 05942-001AD8212 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Normal Operation (7 V to 65 V Supply (V+) Range) ..............9 Applications ....................................................................................... 1 High Voltage Operation Using an External PNP Transistor ... 10 Functional Block Diagram .............................................................. 1 Output Current Compensation Circuit................................... 10 General Description ......................................................................... 1 Applications Information .............................................................. 11 Revision History ............................................................................... 2 General High-Side Current Sensing ........................................ 11 Specifications ..................................................................................... 3 Motor Control ............................................................................. 11 Absolute Maximum Ratings ............................................................ 4 500 V Current Monitor ............................................................. 11 ESD Caution .................................................................................. 4 Bidirectional Current Sensing .................................................. 12 Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ....................................................................... 13 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 13 Theory of Operation ........................................................................ 9 REVISION HISTORY 5/2017Rev. B to Rev. C Changes to Figure 6 .......................................................................... 6 Changes to Figure 10 ........................................................................ 7 Updated Outline Dimensions ....................................................... 13 5/2009Rev. A to Rev. B Changes to Ordering Guide .......................................................... 13 11/2007Rev. 0 to Rev. A Increased Operating Temperature Range ........................ Universal 5/2007Revision 0: Initial Version Rev. C Page 2 of 13