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AD8212YRMZ-R71 Datasheet(PDF) 11 Page - Analog Devices |
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AD8212YRMZ-R71 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page AD8212 Rev. B | Page 11 of 16 APPLICATIONS INFORMATION GENERAL HIGH-SIDE CURRENT SENSING The AD8212 output is intended to drive high impedance nodes. Therefore, if interfacing with a converter, it is recommended that the output voltage across ROUT be buffered, so that the gain of the AD8212 is not affected. AD8661 V+ 1 COM 2 BIAS 3 NC 4 VSENSE 8 NC 7 ALPHA 6 IOUT 5 AD8212 ILOAD IOUT BATTERY RSHUNT ADC ROUT NOTES 1. NC = NO CONNECT. Figure 24. Normal Voltage Range Operation Careful calculations must be made when choosing a gain resistor so as not to exceed the input voltage range of the converter. The output of the AD8212 can be as high as (V+) − 5 V. However, the true output maximum voltage is dependent upon the differential input voltage, and the resulting output current across ROUT, which can be as high as 500 μA (based on a 500 mV maximum input differential limit). MOTOR CONTROL The AD8212 is a practical solution for high-side current sensing in motor control applications. In cases where the shunt resistor is referenced to battery and the current flowing is unidirectional, as shown in Figure 25, the AD8212 monitors the current with no additional supply pin necessary. ROUT MOTOR V+ 1 COM 2 BIAS 3 NC 4 VSENSE 8 NC 7 ALPHA 6 IOUT 5 AD8212 IMOTOR VOUT BATTERY NOTES 1. NC = NO CONNECT. Figure 25. High-Side Current Sensing for Motor Control 500 V CURRENT MONITOR As noted in the High Voltage Operation Using an External PNP Transistor section, the AD8212 common-mode voltage range is extended by using an external PNP transistor. This mode of operation is achievable with many amplifiers featuring a current output. However, typically an external Zener regulator must be added, along with a FET device, to withstand the common-mode voltage and maintain output current accuracy. The AD8212 features an integrated regulator (which acts as a Zener regulator). It offers output current compensation that allows the user to maintain excellent output current accuracy by using any PNP transistor. Reliability is increased due to lower component count. Most importantly, the output current accuracy is high, allowing the user to choose an inexpensive PNP transistor to withstand the increased common-mode voltage. V+ 1 COM 2 BIAS 3 NC 4 VSENSE 8 NC 7 ALPHA 6 IOUT 5 AD8212 ILOAD 500V RSHUNT ROUT 500kΩ VOUT NOTES 1. TRANSISTOR VCE BREAKDOWN VOLTAGE MUST BE 500V. 2. NC = NO CONNECT. Figure 26. High Voltage Operation Using External PNP |
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