Gday Damien
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That answers my second question of accidental drift or knocking from centre position.
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If you look at my schematic, R14 effectively creates a "dead zone" that allows you to be slightly off centre and still stay OFF. You can make that as big as you want, then tweak the sawtooth oscillator to suit the startup PWM you want.
If using a microprocessor with ADC, its equivalent to setting a range where the unit doesnt work.
Andrew