The ADALM-SR1 has two power inputs. The experiment power input is supplied by the user, and the voltage will vary depending on the experiment being run. An additional micro USB connector is the input for a 5V "housekeeping" supply that powers all of the control circuitry, allowing the experiment power to vary over a wide range. An LT3472 boosts/inverts the 5V supply to +15/-2V, respectively. This design provides a high voltage and slightly negative voltage for the LT1995 current sense amplifiers and a negative supply for the error amplifier.
An LT1970-1.25 provides an accurate reference for the error amplifier and duty cycle, current threshold adjustment potentiometers.
The ADALM-SR1 features input overvoltage, undervoltage, reverse voltage, and overcurrent protection. An LTC4368 and associated circuitry protect the experiment power input by only turning on when the supply is between 3V and 15V. The circuit is protected from voltages between -40V and +60V. The LTC4368 also functions as a fuse, shutting off the supply if the current exceeds 2A.
In boost mode, the ADSRALM can produce high voltages under certain conditions. An LTC2912 overvoltage / undervoltage supervisor will disable the switching circuitry if the output exceeds 22V. A SMAJ24A, 24-Volt TVS Diode provides additional protection.