DC1113A

Demonstration circuit 1113 is a general purpose high side current sense amplifier featuring the LTC6102. 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 33.3V/V. The LTC6102 is powered from the same supply that the sense resistor is connected to and provides a ground referenced output. The LTC6102 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, groundloop 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).

• Measurement output signal of 2V (IOUT = 10A)
• Measurement output signal (current mode) of 400µA at IOUT =10A, R3 removed
• Output load current of 12A (thermal limit of RSENSE)
• VIN quiescent current of 230µA (VIN =12V, IOUT = 0A)
• Vmon step-response time of 4µs (IOUT step from 0A to 10A)

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