Micropower_comparator_with_high_current_switch

Published:2009/7/24 4:35:00 Author:Jessie | From:SeekIC

Fig. 15-19 This circuit provides a method of continuously monitoring an input voltage while dissipating only 100μW of power, but still being capable of switching a 500 mA load if the input exceeds a given value. The reference voltage can be any value between +8.5 and -8.5 V. The comparator resolves input voltage differences down into the 0.2-mV region. R1 provides for input-offset null. The load can be a resistor, relay coil, or lamp, so long as load current does not exceed 500 mA. For V+ less than 15 V and IL less than 25 mA, Q2 and R2 can be omitted. National Semiconductor Lineal Applications Handbook 1901, p. 205.



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