ANALOG DEVICES DC1115A Demonstration Board, LTC6101, High-Voltage, High-Side Current-Sense Amplifier

DC1115A demonstration circuit is a general purpose highside current-sense amplifier featuring the LTC6101. This demo board amplifies an on-board current-sense resistor voltage-drop, providing a precision uni-polar output voltage proportional to load current. The demo circuit includes scaling resistors that program the gain of the circuit to 25V/V. The LTC6101 is powered from the same supply that the sense resistor is connected to and provides a ground referenced output. The LTC6101 can perform current measurements on supplies ranging from 4V to 60V. Since the output voltage is developed as a controlled current through a load resistance, ground loop errors can be eliminated by simply locating the load resistor at the destination point (subsequent signal processing such as A/D conversion). Remote loading can be evaluated by simply removing the on board load resistor (R3).

• 2.5V typ measurement output signal at IOUT = 5A, TA = 25°C
• 500µA typ measurement output signal(current mode) at IOUT = 5A, R3 removed, TA = 25°C
• 7A max output load current range at thermal limit o fRSENSE at TA = 25°C
• 250µA typ VIN quiescent current at VIN =12V, IOUT = 0A, TA = 25°C
• 2µs typ VM ON step-response time at IOUT step from 0A to 5A, TA = 25°C