SR086SG-G (MICROCHIP)

The SR086SG-G is an adjustable off-line inductorless Switching Regulator for lighting controls and household appliances. The inductorless switching regulator designed to operate directly from a rectified AC line. The operating principle is to turn on a pass transistor when the rectified AC is below the output voltage and to turn it off when the output voltage reaches a specific level. A linear regulator supplied by VOUT provides an additional fixed 3.3V output. Efficiencies of around 55% may be realized for loads up to 1.0W in 120VAC applications, with around 50% efficiencies for loads up to 800mW in 230VAC applications. A logic-level enable input allows the SR086 to be disabled - useful when it is employed as a keep-alive power supply.