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Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
A simple reply for this all. When you used 555 with a wrong gate resistor setting, it just kept operating as a normal generator. Then, with the floating ground as in your first schematic, you had a threshold because of the driver's own power consumption as it like added an additional midpoint to be used as a "zero level". Then, after you've placed the resistor properly, you've lost the leakage-capacitive divider you had in the very first version, so the charge/discharge times are longer of course. The reson why to use a driver is a higher pulsed current, but to utilize it you'll need a smaller resistor of course. 100 Ohm means 17/100=170mA which is way below the optimal current, you only need a few Ohms there.
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TC4422 driver waveform