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Low Power Under- and Over-Voltage Monitor (THS4012CDG4)

2015-03-16 20:31  
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This article describes the Low Power Under-and Over-Voltage Monitor (THS4012CDG4). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components:THS4012CDG4.

This voltage monitor has two? threshold, VTH for undervoltage and VTH’ for overvoltage. Using the component values shown in the schematic diagram below, this circuit give 6V for VTH and 15V for VTH1. Above 6V, the LED indicator of this voltage monitor? circuit will increase the flash rate until reach 15V.? This circuit will stop flashing at voltage below 6V and above 15 volts since there will be no current flowing through C1.? At threshold? boundary, the output of LM10 will saturate to negative below VTH and saturate to positive above VTH’.

Double ended Voltage Monitor circuit schematic

To customize circuit we can select the resistors values according to chosen VTH and VTH’ using the following formula:

VTH=[R4(R1 R2)Vref]/[R1(R3 R4)];

VTH’=[R4(R1 R2)Vref]/[R1(R3 R4)-R3(R1 R2)]

Since the current consumption is very small (around 500uA), this voltage monitor will be suitable for various application? demanding low cost solution,? such as battery monitoring, small testing equipments, or power line indication.

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