Supertex公司的SR10是非隔离的电容耦合的离线开关电源稳压器，能直接从AC火线工作， 120VAC 到240VAC输入，输出电压采用内部反馈分压器可设定为6.0V，12V或24V，也可用外接电阻设定6.0V-28V，输出电流可达50mA，效率达75%，主要用在家用电器，白色家电，照明控制和三表.本文介绍了SR10主要特性，方框图， 全波和半波整流应用电路图， EMI测试电路图以及SR10评估板主要指标，电路图和材料清单.

 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.

 SR10主要特性:

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应用:

Household appliances

White goods

Lighting controls

Utility meters

图1.SR10方框图

图3.SR10半波整流应用电路图

图4.SR10 EMI测试电路图

SR10评估板

The Supertex SR10 is an inductorless switching power supply controller intended for operation directly from a rectified 120/240VAC line. Due to the capacitor-coupled， switched shunt topology (CCSS)， it exhibits low standby power and good efficiency while employing no magnetics nor high voltage electrolytic capacitors.

To meet a wide variety of applications， the SR10DB1 is highly configurable. Many components are socketed. Half or full-wave rectification is jumper-selectable. Output voltage is jumper-selectable to 3 fixed voltages or may be set anywhere in the range of 6 - 28V using an on-board feedback divider.

SR10评估板指标: