Analog DevicesEVAL-CN0241-SDPZDevelopment Kits and Tools

EVAL-CN0241-SDPZ is CN0241 High-Side Current Sensing with Input Overvoltage Protection. CN0241 is a classic high-side current sensing circuit topology with a single sense resistor. The other four resistors (dual 1 kΩ/20 kΩ divider) are in a thin film network (for ratio matching) and are used to set the difference amplifier gain.

uses the overvoltage protected ADA4096-2 op amp connected as a difference amplifier to monitor the high-side current. The ADA4096-2 has input overvoltage protection, without phase reversal or latch-up, for voltages of 32 V higher than and lower than the supply rails.

The circuit is powered by the ADP3336 adjustable low dropout 500 mA linear regulator, which can also be used to supply power to other parts of the system, if desired. Its input voltage can range from 5.2 V to 12 V when set for a 5 V output. To save power, the current sensing circuit can be powered down by removing power to the ADP3336; however, the power source, such as a solar panel, can still operate.