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BQ500100DCKT Datasheet(PDF) 7 Page - Texas Instruments |
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BQ500100DCKT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 18 page IN- IN+ GND V+ OUT Bias Gain = 50 V/V Current-Sensing Amplifier bq500100 www.ti.com SBOS765 – JANUARY 2016 7 Detailed Description 7.1 Overview The bq500100 is specially-designed to facilitate foreign object detection (FOD) in wireless charging applications by monitoring the coil supply current. The current-sensing amplifier is able to accurately measure voltages developed across a current-sensing resistor on common-mode voltages that far exceed the supply voltage powering the device. Current can be measured on input voltage rails as high as 20 V when the device is powered off a lower supply voltage. Low drift characteristics enables high-precision measurements with maximum input offset voltages as low as 200 µV with a maximum temperature contribution of 0.5 µV/°C over the full temperature range of –40°C to +105°C. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 High Input Common-Mode Range The bq500100 can support input common-mode voltages up to 20 V. Because of the internal topology, the common-mode range is not restricted by the supply voltage as long as the input supply stays within the operational range of 2.7 V to 6 V. The ability to operate with supply voltages lower than the input voltage common-mode signal makes the device well-suited for monitoring the current in wireless charging applications where the common-mode voltage varies to obtain a desired amount of power transfer. When the dc common-mode voltage varies, the effect on the output voltage is very small as a result of the high common-mode rejection. The dc common-mode rejection for the bq500100 is expressed in decibels and is typically as high as 120 dB. In wireless charging applications, the current-sensed rail commonly varies in voltage to adjust for the amount of power transferred by the coil. 7.3.2 High Current-Sense Accuracy Over a Wide Dynamic Range The offset voltage, gain error, and shunt resistor are the three primary contributors that determine the current measurement accuracy over a specified current range. The offset voltage dominates the error when operating at low current values and the gain error dominates when operating at high current values. The low offset voltage allows use of smaller shunt resistors values. Both the low offset and gain error allow the bq500100 to accurately measure current over a wide dynamic range and still maintain a high level of accuracy. Copyright © 2016, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: bq500100 |
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