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AD8214ARMZ-R7 Datasheet(PDF) 10 Page - Analog Devices |
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AD8214ARMZ-R7 Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD8214 Rev. 0 | Page 10 of 16 THEORY OF OPERATION The AD8214 is a high voltage comparator offering an input-to- output response time of less than 100 ns. This device is ideal for detecting overcurrent conditions on the high side of the control loop. The AD8214 is designed specifically to facilitate and allow for fast shutdown of the control loop, preventing damage due to excessive currents to the FET, load, or shunt resistor. The AD8214 operates with a supply of 5 V to 65 V. It combines a fast comparator, optimized for high side operation, with a 2.4 V series voltage regulator. The regulator provides a stable voltage that is negative with respect to the positive supply rail, and it is intended to provide power to the internal electronics, set a comparison threshold below the supply rail, and power small application circuits used with the comparator. The differential input of the comparator may be operated at, or slightly above or below, the positive supply rail. Typically, one of the comparator inputs is driven negative with respect to the positive supply by a small series resistor carrying the main supply current to the load. The other input of the comparator connects to a voltage divider across the regulator, so the comparator trips as the voltage across the series resistor crosses the user-selected threshold. The AD8214 features a current output. The current is low (100 nA typical), until the user selected threshold is crossed. After this point the output switches to high (1 mA typical). The current output driver complies with load voltage from 0 V to (VS – 2.4 V). The current easily drives a ground referenced resistor to develop logic levels determined by the value of the load resistor. The comparator input is balanced to switch as the inverting input (–IN) is driven negative with respect to the noninverting input (+IN). As the comparator output switches from 0 mA to 1 mA, a small hysteresis (10 mV) is activated to minimize the effects of noise in the system that may be triggered by the comparator signal. This means that to restore the output to zero, the input polarity must be reversed by 10 mV beyond the original threshold. 1 3 2 BATTERY SHUNT TO LOAD + _ CONSTANT THRESHOLD VOLTAGE DROP ACROSS SHUNT CORRESPONDING TO CURRENT LEVEL + _ R1 R2 2.4V REGULATOR 1 3 6 5 8 2 CONSTANT 2.4V UP TO 65V I Figure 28. Simplified Schematic |
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