micro power flasher draws less than 50 µA

Posted on Aug 19, 2012

Some applications require a circuit to indicate that a battery`s voltage has fallen below a certain value. However, if you don`t frequently check the indicator, the low-battery indicator itself can easily discharge the battery. The circuit in Figure 1 indicates when the battery voltage has dropped below a preset value. The circuit draws less than 50 µA, regardless of whether the indicator flashes. IC1A operates as a simple comparator.

The circuit`s current consumption is 45 µA at 10V, climbing to 48 µA at 12V. The state of the flasher does not affect current consumption, because the LED receives its power via the capacitor. You have to make a number of trade-offs to achieve

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