Other Parts Discussed in Thread: TLV7031
Hello,
I am looking into the potential use of the TLV3691 in an autonomous power supply design where there is only one voltage source. I have simulated the comparator in LTspice as shown below. I have not reproduced the power generation side because of IP issues. Instead I have simply used a voltage supply to simulate one power source. The smaller capacitor C7 is supposed to store energy to power the comparator and the larger capacitor is supposed to store energy for the load. The TLV3691 is supposed to turn ON a MOSFET once the comparator is operational at 0.9V.
Why do we see the glitch at the comparator output between 0.5Ks and 1.0Ks? Should the pull-down resistor R5 not ensure that node "Vgate" is held LOW until switching occurs? I have read one thread in the forum closely related to what I am talking about here. The prescribed pull-down does not seem to work in a reliable way when the comparator supply is less than 0.9V. Any comments?
Chundra