High-precision bidirectional current monitors enable accurate measurement at low BoM

Diodes Incorporated offer a series of bidirectional current monitors based on a high-stability zero-drift architecture. These devices can accurately measure very low sense voltages over a wide range of common-mode voltages. Key applications include servers, power supply racks in server farms, laptop PCs, battery chargers, industrial servos, and robotic systems.

Consisting of six different variants, the DIODES ZXCT199 series of current monitor devices each feature a precision chopper stabilized op-amp for high accuracy. Their low offset voltage enables current sensing with maximum drops across shunts as low as 10mV full-scale. This enables high currents to be measured through inexpensive, low-value shunt resistor components.

The series are voltage output type devices offered in three fixed voltage gain options in 50V/V, 100V/V, and 200V/V. These devices measure voltages across shunts at common-mode voltages from -0.1V to 26V, independent of the supply voltage.

The new current sensors' operating temperature range of -40C to 125C displays minimal gain error across this. The maximum gain error over temperature is ±1% for the A and B versions, while for the C version, it is ±0.8%. Their offset voltage levels are a maximum of ±150μV for the A version, ±100μV for the B version, and an ultra-low ±80μV for the highest precision C version. All variants can be powered with a 2.7V to 26V supply, providing them greater application flexibility. A maximum supply current of only 100μA is drawn.