Current sense amplifier ICs ideal for current sensing applications

ROHM has created space-saving, high-accuracy current sense amplifier ICs (BD1421x-LA series) for industrial applications – incorporating wireless base stations, PLCs and inverters – and consumer applications such as home appliances.

The company has used its strengths in analog technology to develop a new series of current sense amplifier ICs that attains high accuracy current sensing in a space-saving design. The BD14210G-LA includes all needed peripheral components. That simplifies current sensing by connecting a shunt resistor and a bypass capacitor. This decreases the number of components from 11 to just three compared to conventional configurations (operational amplifier plus discrete components). Also, it reduces the mounting area by 46% (SSOP6 package).

Further, a highly accurate current detection of ±1% over the entire temperature range (-40C to +125C) has been delivered. The internal circuitry decreases current detection accuracy even when an external RC filter circuit for noise suppression is added. That minimises the number of man-hours needed for design. The wide input voltage range (-0.2V to +26V) makes the BD14210G-LA ideal for current sensing applications operating from 12V/24V power supplies.

The company delivers current sensing solutions combining the new sense amplifier ICs with an extensive lineup of shunt resistors. More support materials, such as reference designs, are available. The company also offer SPICE models that can be downloaded from the company's website.

Application examples include industrial equipment: wireless base stations, PLC, inverters, chargers, etc; and consumer devices: air purifiers, refrigerators and more.