Resistor R₅and an ORing diode isolate the hysteresis circuit from the power supply and keep the switching point constant no matter how the power supply changes

Authors	Peter Demchenko
Main Document	Article «Comparator directly controls power-MOSFET gate»
Description	Figure 2
File Format / Size	PDF / 14 Kb
Document Language	English

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Article «Comparator directly controls power-MOSFET gate»

Figure 1. Hysteresis components R₁ and R₂ tie to the unregulated supply, causing the comparator's switching point to vary with the power supply
Figure 2. Resistor R₅and an ORing diode isolate the hysteresis circuit from the power supply and keep the switching point constant no matter how the power supply changes
Figure 3. The internal design of the LM193 comparator requires that you keep the input pins 2 V below the positive rail

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