Recommended: Electronic trip unit solutions for low voltage circuit breaker applications

The power management IC ADP2450 is a special customized product of ADI, designed for low-voltage circuit breakers such as MCCB and ACB. Ideally, an MCU + ADP2450 and some passive components can build a complete ETU system. Therefore, for low-voltage circuit breaker applications, ADP2450 can be said to be a supporting device for MCU.

• A low-power shunt boost controller converts the current source (output of the current transformer) into a voltage source. In addition, it has a power detection circuit that allows flexible setting of system-level startup current and hysteresis;

• A 36 V high voltage input buck regulator can effectively regulate the voltage and output 3.3 V/ 5 V/ adjustable output for MCU and signal conditioning circuits. The output current can reach up to 500 mA;

• An integrated power supply monitoring circuit provides a safe system-level reset function;

• The ADP2450 integrates four programmable gain amplifiers (PGAs) that provide 15 different gain setting options. The PGA can also support two different topologies (inverting and differential input modes) to connect different CT topologies (single coil or dual coil);

• There is also a general-purpose operational amplifier inside that can be used as a signal amplifier for ground fault, leakage/residual current detection or other purposes;

• There are 4 analog trip units with programmable thresholds inside, which can be used to implement the MCR (Match Current Trip) function of ACB. The analog trip unit supports single-coil and double-coil user housings based on different packaging models;

• At the same time, a power drive circuit for an actuator is integrated;

• Enhanced temperature range covers –40°C to +125°C;

• The PGA inputs feature ±8 V OVP and 4 kV ESD protection (HBM) to provide a higher level of system protection .

ADP2450 EVB Board