DC2275A: 120V @ 25 ~ 80mA, 10 ~ 48V in

DC2275A features the LT8331 in boost configuration. The demo circuit demonstrates small size and low component count. The boost is designed to convert a 10V to 48V source to 120V at 25mA to 80mA. DC2275A includes an optional circuit on the back of the board for a charge pump that can be used to double the output voltage. The default mode for this application is pulse-skip mode, but removal of R13 allows for other modes to be used for different applications. A jumper from sync to ground will put the converter in Burst Mode operation, or an external clock can be used to synchronize the converter to an external frequency.

The LT8331 can operate with inputs as high as 100V but in this demo circuit, the input is limited by the voltage rating of the input capacitor. The LT8331 includes many other features such as synchronization to external clock, user configurable under voltage lockout, soft-start, frequency foldback, and it is easily configured as boost, SEPIC or inverting converter. The LT8331 IC data sheet gives a complete description of the device, operation and application information.

Burst Mode operation consumes as low as 6µA quiescent current to maintain high efficiency at very low output currents, while keeping typical output ripple below 20mV.