ANALOG DEVICES DC1240A Demonstration Board, LT6106, 36V, High-Side Current-Sense Amplifier

DC1240A is a demonstration circuit featuring the LT6106. This LT1606 is a general-purpose high-side current-sense amplifier. 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 LT6106 is powered from the same supply that the sense resistor is connected to and provides a ground-referenced output. The LT6106 can perform current measurements on supplies ranging from 2.7V to 36V. 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
• 65µA typ VIN quiescent current at VIN =12V, IOUT = 0A, TA = 25°C
• 5µs typ VM ON step-response time at IOUT step from 0A to 5A, TA = 25°C