DC1117A

DC1117A demonstration circuit features LTC6104 bi-directional, high voltage, high side, current sense amplifier. This demo board amplifies a current-sense resistor voltage-drop, and provides a precision bi-polar output voltage proportional to bidirectional load current. The LTC6104 is implemented with dual input amplifier sections, one for each polarity of load current. The demo circuit includes scaling resistors that program the gain of each amplification polarity to 25V/V. Both input sections of the LTC6104 are powered from the same supply that the sense resistor is connected to and generates a bipolar signal referenced to a user furnished potential VREF, such as 2.5V. Since the O/P voltage is developed as a bidirectionally controlled current through a load resistance, ground-loop errors can be eliminated by simply locating the load resistor at the destination point. Remote loading can be evaluated by simply removing the on-board load resistor (R4).

• LTC6104 can perform bi-directional current measurements on supplies ranging from 4V to 60V
• 400µA typ measurement output signal (current mode) at IOUTA = 4A, R4 removed
• (-)400µA typ measurement output signal (current mode) at IOUTA = -4A, R4 removed
• ±7A output load current range at thermal limit of RSENSE
• 520µA typ VIN quiescent current at VINA =12V, IOUTA = 0A
• 2µs typ VMON step-response time at IOUT step from 0A to ±4A