SSTC Soft Start 555 Latch

- Top left switch power on / off - Bottom right button discharge load capacitor - RC network on comparator (-) input controls timing. (+) Input is set such that RC product is approximately the delay time (1 time constant) - Timing parameters ( Main AC voltage and frequency, Big Load RC, and comperator timing RC) scaled down by ~10 to be shown properly in the app - AC relay is only for simulation. Actually main switch turns on mains AC which powers 12V supply for logic circuit - NMOS is IRLZ44N - On switch on 555 latch gets reset from RC pulse on threshold pin (Several times in reality due to bouncing effect) - On soft start delay end, delay timing capacitor gets discharged via BJT

published 3 years ago