SR10

Supertex inc. Capacitor-Coupled, Switched Shunt, (CCSS) Regulator Features ► Efficiencies up to 75% at 20mA ► Less than 20mW standby power ► Optional 6.0V, 12V or 24V fixed output voltage, or adjustable from 6.0V to 28V ► Output current scalable up to 50mA ► 120VAC to 240VAC input ► No magnetics ► Inherent short circuit protection SR10 General Description The Supertex SR10 is a non-isolated, capacitor-coupled, switched shunt regulator designed to operate directly from the AC line. Output voltage can be either fixed at 6.0V, 12V, or 24V using an internal feedback divider or be adjusted over a 6.0V to 28V range using an external feedback divider. Output current capability is scalable to 50mA, by selection of the series coupling capacitor (CS) on the AC line. Standby power can be under 20mW, and efficiencies of 75% are possible depending upon configuration and degree of transient protection. All components except for CS are low voltage, easing PCB layout and alleviating high voltage creepage concerns. Inherent short circuit protection is afforded by the reactance of the CS series capacitor, which limits current even with a dead short on the output. Overcurrent protection (OCP) shuts off the shunt during a line transient. Refer to application note AN-H65 for further information. Applications ► ► ► ► Household appliances White goods Lighting controls Utility meters Typical Application Circuits Full-wave Rectification RLIM CS VIN 90 - 275VAC 50 - 60Hz D1 - 4 RBL DOUT fixed 6V, 1...