Monolithic Power Systems Inc. EVCS1800-S-25-00A

Overview

EVCS1800-S-25-00A from Monolithic Power Systems is a linear Hall-effect current sensor evaluation board designed to demonstrate the MCS180XGS-25 current sensor IC, supporting ±25 A primary current sensing with 55 mV/A typical sensitivity and 3.3 V supply, featuring galvanic isolation, differential Hall array for stray-field rejection, and 100 kHz bandwidth.

For engineers reviewing the EVCS1800-S-25-00A datasheet, EVCS1800-S-25-00A pinout, EVCS1800-S-25-00A application, or EVCS1800-S-25-00A equivalent, this board enables rapid validation of isolated DC/AC current measurement in motor control, power supply monitoring, and over-current protection circuits under real-world thermal and noise conditions.

Technical Context

The EVCS1800-S-25-00A implements a monolithic SOIC-8 packaged MCS180XGS-25 sensor with integrated primary conductor (0.9 mΩ resistance), differential Hall element, and analog ratiometric output (VOUT = 0.5 × VCC + Sens × IP). It operates at 3.3 V and delivers ±25 A full-scale range with 4 μs rise time and 100 kHz small-signal bandwidth.

Board-level design includes decoupling capacitors (C1: 0.1 µF, C2: 4.7 µF), screw terminals (IP+, IP−) for high-current injection, and configurable filter capacitor C4 to tune bandwidth. The galvanic isolation barrier (≥2.5 kVRMS) replaces optocouplers in safety-critical current feedback paths.

Key Specifications

Availability

EVCS1800-S-25-00A is available at Aetrix Electronics and suitable for motor control validation, switch-mode power supply current monitoring, and over-current fault protection prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for EVCS1800-S-25-00A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, including DC/DC converters, LED drivers, and precision analog sensors.

The EVCS1800-S-25-00A belongs to MPS's current sensing evaluation board family, developed to accelerate adoption of their galvanically isolated Hall-effect sensors in industrial and automotive power systems where accuracy, bandwidth, and safety isolation are critical.

FAQ

What is the maximum continuous primary current the EVCS1800-S-25-00A can safely handle?

The board is rated for ±25 A primary current per the MCS180XGS-25 sensor specification. Its 0.9 mΩ internal conductor and PCB layout support continuous operation at this level without thermal derating under standard ambient conditions (25°C, free air).

Does the EVCS1800-S-25-00A require external calibration for accurate current measurement?

No external calibration is required. The MCS180XGS-25 sensor features factory-trimmed sensitivity (55 mV/A typ.) and offset (0.5 × VCC), delivering ±1.5% total error over temperature (–40°C to 125°C) without user adjustment.

Can the EVCS1800-S-25-00A be used with a 5 V supply instead of 3.3 V?

No - this specific variant (EVCS1800-S-25-00A) is optimized for 3.3 V operation. Using 5 V may exceed absolute maximum ratings of the MCS180XGS-25 IC and invalidate performance specifications; other variants like EVCS1801-S-25-00A support 5 V.

How does the differential Hall array improve measurement accuracy?

The integrated differential Hall element rejects uniform external magnetic fields (e.g., from nearby inductors or busbars) by canceling common-mode interference, improving immunity to stray fields by >40 dB compared to single-element Hall sensors.

What is the role of capacitor C4 on the evaluation board?

C4 sets the sensor's small-signal bandwidth: increasing its value lowers the –3 dB point (e.g., 1 nF → ~100 kHz; 10 nF → ~10 kHz), enabling trade-offs between noise filtering and response speed for specific application dynamics.

Is the primary conductor on the EVCS1800-S-25-00A accessible for custom current path integration?

Yes - the IP+ and IP− screw terminals provide direct access to the internal 0.9 mΩ copper conductor path. Users may bypass the terminals and solder wires directly to the designated pads for low-inductance, high-frequency current injection.