DC1192A

Demonstration circuit 1192 is a precision, gain selectable high side current sense amplifier featuring the LT6105. This demo board amplifies a current-sense resistor IRdrop, providing a precision uni-polar output voltage proportional to load current. The LT6105 is powered from a supply voltage (from 2.85V up to 36V) while it measures current for voltage power bus (0V to 44V). This device is suitable for measuring battery system current since the monitoring-input current draws become negligible when VCC is powered down. Its 0V and up input range makes it suitable for measuring supply bus loading as they are brought up. When provided with a negative supply, it is capable of monitoring negative supplies.

• Monitored supply input range from -0.3V to 44V
• Voltage gain of 50V/V at RIN1 = RIN2 = 100, ROUT = 4.99k
• Total current to voltage gain of 1 V/A at RSENSE = .020ohm
• Output voltage of 2V at V+ = 3V
• Maximum sense current of 10A at thermal limit of RSENSE (2Watts)
• V+ (=Vcc) supply current of 150µA at V+= 36V, VS+=3V, VSENSE=0V
• Vmon step-response time of 50µs at IOUT step from 0A to 5A

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