LifePak Defibrillator Power Monitor Diagram

Logic Power Monitor

The Logic Power Monitor checks the logic supply voltage. If the logic voltage is above or below normal limits, it deactivates Q11 and disables the Power Control circuit. Comparator U5 functions as a window detector for high voltages (U5A) and low voltages (U5B). The comparator reference voltages are set by Diode IC U4 at +2.5 V. The output of the Power Control circuit, SWBATT, generates the operating voltage for U5, U4, and the Switching Power Supply.

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