RT established a constant charging current for CT. The SG2524 and SG3524 were designed for switching regulators of either polarity, transformer-coupled dc-to-dc converters, transformerless voltage doublers, and polarity-converter applications employing fixed-frequency, pulse-width modulation (PWM) techniques. The switching frequency can be set for a 450kHz.
Java script calculator for this active filter can be found here. I've been using it as a backup to power up all my house when outages occur since aprox. Sg3524 frequency calculator However, we can talk about the open-loop gain, or simply the Loop gain.
