SR087Adjustable Off-line Inductorless Switching Regulator | AC DC Converters, Offline Switches | 1 | Active | SR087 is an 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 5.0V 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 SR087 to be disabled – useful when it is employed as a keep-alive power supply.
WARNING! Galvanic isolation is not provided. Dangerous voltages are present when connected to the AC line. It is the responsibility of the designer employing the SR087 to ensure adequate safeguards are in place to protect the end user from electrical shock.
The circuits shown in this datasheet are not guaranteed to meet surge and conducted EMI requirements. The effectiveness of these circuits may vary with a particular application. The designer should conduct tests to ascertain compliance with applicable standards and regulations. |
SR10Capacitor-Coupled, Switched Shunt, (CCSS) Regulator | AC DC Converters, Offline Switches | 1 | Active | 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. |
| RF Amplifiers | 1 | Active | |
| RF Amplifiers | 1 | Active | |
| RF Front End (LNA + PA) | 1 | Active | |
| RF Amplifiers | 1 | Active | |
| RF Amplifiers | 1 | Active | |
| RF and Wireless | 2 | Active | |
| RF Amplifiers | 1 | Active | |
| Memory | 3 | Active | SST's serial flash family features a four-wire, SPI-compatible interface that allows for a low pin-count package occupying less board space and ultimately lowering total system costs. SST25LF020A SPI serial flash memories are manufactured with SST proprietary, high performance CMOS SuperFlash technology. The splitgate cell design and thick-oxide tunneling injector attain better reliability and manufacturability compared with alternate approaches. |
