Monolithic Power Systems Inc. EVCS1803-S-40-00A

Overview

EVCS1803-S-40-00A from Monolithic Power Systems is a linear Hall-effect current sensor evaluation board designed to demonstrate the MCS180XGS-40 current sensor IC, supporting ±40 A primary current sensing at 5 V supply, with 50 mV/A typical sensitivity, galvanic isolation, and 100 kHz bandwidth for real-time current monitoring in power electronics.

For engineers reviewing the EVCS1803-S-40-00A datasheet, EVCS1803-S-40-00A pinout, EVCS1803-S-40-00A application, or EVCS1803-S-40-00A equivalent, this board enables rapid validation of isolated DC/AC current measurement performance, output linearity, bandwidth response, and thermal stability under load-critical for motor control, SMPS, and over-current protection prototyping.

Technical Context

The EVCS1803-S-40-00A implements the MCS180XGS-40 IC in SOIC-8 package, featuring a differential Hall array that rejects external magnetic interference while measuring bidirectional current through an integrated 0.9 mΩ primary conductor. It operates at 5 V supply and delivers ratiometric analog output (VOUT = 2.5 V ± 2.0 V) proportional to ±40 A input.

Board-level design includes decoupling capacitors (C1: 0.1 µF, C2: 4.7 µF), optional filter capacitor C4 to adjust bandwidth, and screw terminals (IP+, IP−) rated for high-current connection. The VOUT signal is accessible via header JP2 for oscilloscope or ADC interface.

Key Specifications

Availability

EVCS1803-S-40-00A is available at Aetrix Electronics and suitable for motor control validation, switch-mode power supply current feedback, and over-current fault protection prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for EVCS1803-S-40-00A 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 MCS180X product line was developed to deliver cost-effective, galvanically isolated current sensing for industrial and automotive power systems-replacing optocouplers and shunt-based solutions with integrated Hall-effect technology.

FAQ

What is the required supply voltage for EVCS1803-S-40-00A operation?

The board is optimized for 5 V DC supply, matching the MCS180XGS-40 IC's specified VCC. While the underlying MCS180X family supports 3.3 V or 5 V, this specific variant (EVCS1803-S-40-00A) uses the 5 V configuration to achieve ±40 A full-scale range and 50 mV/A sensitivity. Applying 3.3 V will result in incorrect scaling and reduced dynamic range.

How is primary current connected to the evaluation board?

Primary current is applied via two 4-pin Philips screw terminals labeled IP+ and IP− (Keystone 8191K-ND), rated for secure high-current connection. These terminals connect directly to the internal 0.9 mΩ conductive path of the MCS180XGS-40 IC, enabling galvanically isolated measurement without external shunts or transformers.

Can the bandwidth be adjusted on this evaluation board?

Yes, bandwidth is adjustable via capacitor C4 (unpopulated footprint). With C4 open, bandwidth reaches 100 kHz. Adding capacitance at C4 reduces bandwidth-e.g., 1 nF lowers it to ~10 kHz-allowing noise filtering or slew-rate limiting for specific control loop requirements without modifying the sensor IC itself.

What does the VOUT signal represent electrically?

VOUT is a ratiometric analog voltage centered at VCC/2 (2.5 V @ 5 V supply), varying ±2.0 V over the ±40 A range (50 mV/A). It is referenced to board GND, buffered, and accessible via JP2 pin 1. No additional amplification or level-shifting is needed for direct ADC interfacing with 0–5 V or ±2.5 V input ranges.

Is galvanic isolation verified on this board?

Yes-galvanic isolation is inherent to the MCS180XGS-40 IC, with reinforced insulation between primary conductor (IP+, IP− pins) and secondary side (VCC, GND, VOUT, FILT). The board maintains creepage/clearance per IEC 60950-1, and isolation withstand voltage is 2.5 kVRMS (per MCS180XGS datasheet), validated during MPS qualification testing.

Does this board support AC current measurement?

Yes-the MCS180XGS-40 IC and thus the EVCS1803-S-40-00A board support true bidirectional AC and DC current sensing up to 100 kHz. Output faithfully tracks sinusoidal, pulsed, or transient waveforms within bandwidth and slew limits; test waveforms in the reference document include 50 A AC step-up/down and startup/shutdown transients.