Abstract: This circuit monitors current flow at high voltage (48V and higher) using a standard 5V difference amplifier (MAX4198) referenced to ground. It also employs a digital potentiometer (MAX5402) for gain adjustment. Maxim > App Notes > Amplifier and Comparator Circuits Digital Potentiometers Keywords: high-voltage current monitors, difference amplifiers, adjustable gain, pnp transistors, digital potentiometers Dec 21, 2010 APPLICATION NOTE 4546 High-Voltage, Programmable-Gain Current Monitor Abstract:This circuit monitors current flow at high voltage (48V and higher) using a standard 5V difference amplifier (MAX4198) referenced to ground. It also employs a digital potentiometer (MAX5402) for gain adjustment. A similar version of this article appeared in the June 1, 2007 issue of PET . Telcom, LDMOS, automotive, and numerous other applications require the measurement of current flow at high voltages (high-side current). Often, a circuit operating at 5V must monitor ……