PWM controller for low noise power supplies

rsdio writes:  These parts look promising on paper, but the sample circuit has too many parts for an inexpensive implementation. I’m still sure something can be learned by studying the data sheets. MAX5975A, MAX5975B Current-Mode PWM Controllers with Frequency Dithering for EMI-Sensitive Power Supplies: High Efficiency at Light Loads Meets Green Requirements of Next-Generation IP […]

App note: High-side, current-sense amplifiers with 12-bit ADC and op amp/comparator

Another article that might help with bench power supply designs: Current-Sense Amplifiers with Digital Output and 60V Common-Mode Range Offers easy interface with microcontrollers (supports 1.8V logic) by using digital outputs Delivers wide 60V common-mode range for robustness under fault conditions Includes internal op amp/comparator that allows flexibility in system design: the internal amplifier can […]

App Note: Isolated power using capacitors

rsdio tipped us to an app note on isolated power-supply circuits: Wow! It’s quite interesting to see how to substitute capacitors for a transformer. Without digging deeper, though, it’s not clear whether voltage boost can be achieved. An integrated H-bridge driver for isolated power-supply circuits (MAX256) usually drives the primary of a transformer, but it […]

App note: Load-power monitor improves high-side current measurements

This amplifier with an analog voltage multiplier could be useful in a bench power supply: Combining a high-side current-sense amplifier with an analog voltage multiplier, the MAX4211 can easily measure the power dissipated in a load. One multiplier input connects to the load voltage, and the other to an internal analog of the load current—that […]

Prototype: Web platform v1.1

The web platform is a tiny server designed for networked hacks where a full PC is inconvenient. This tiny internet appliance can connect to web services, control physical objects from a browser interface, or email sensor status reports. It’s our go-to board for interactive internet art like the @tweet tree Twitter-controlled Christmas tree. Web platform […]