DC1659A-B Analog Devices

DEMO MANUAL DC1659A LT6109-1/LT6109-2 High Side Current Sense Amplifiers with Reference and Comparators DESCRIPTION Demonstration circuit 1659A features the LT 6109, a high two inverting inputs available. Both current sense gain side current sense amplifier with two comparators and a and current fault limits are set by on board resistors and 400mV reference. are the same for both boards. The gain is set at 100V/V and the comparators are set to trip at current thresholds The demo board circuit amplifies the voltage across an of 50mA and 300mA. on-board current sense resistor, to provide a precision unipolar voltage output that is proportional to the sensed The key performance specifications are listed in the table current. The board has two on-board comparators with below. latching outputs and an integrated 400mV reference that Design files for this circuit board are available at sets the threshold for the comparators. There are two ver- DEMO MANUAL DC1659A BLOCK DIAGRAMS LT6109-1 (DC1659A-A) LT6109-2 (DC1659A-B) 9 9 + + LT6109-1 LT6109-2 V V 100 100 3k 34V 6V 3k 34V 6V SENSEHI SENSEHI 10 10 SENSELO 3k SENSELO 3k OUTA OUTA 1 + 1 + 8 8 V V V V + + V V V V 200nA 200nA EN/RST EN/RST ENABLE AND ENABLE AND 2 2 RESET TIMING RESET TIMING RESET RESET + + V V INC2 INC2 7 7 UNDERCURRENT FLAG OVERCURRENT FLAG OUTC2 OUTC2 3 3 + + V V 400mV V 400mV V + + REFERENCE V REFERENCE V V V OVERCURRENT FLAG OVERCURRENT FLAG OUTC1 OUTC1 4 4 INC1 INC1 6 6 V V 5 5 610912 F01 610912 F02 dc1659af 2 + + + +