Monolithic Power Systems Inc. EVCS1802-S-30-00A

Overview

EVCS1802-S-30-00A from Monolithic Power Systems is a linear Hall-effect current sensor evaluation board designed to demonstrate the MCS180XGS-30 sensor, supporting ±30 A primary current sensing at 3.3 V supply, with 44 mV/A typical sensitivity, differential Hall array for stray-field rejection, and galvanic isolation between primary conductor (IP+/IP−) and signal pins (VOUT, VCC, GND).

For engineers reviewing the EVCS1802-S-30-00A datasheet, EVCS1802-S-30-00A pinout, EVCS1802-S-30-00A application, or EVCS1802-S-30-00A equivalent, this board enables rapid validation of isolated DC/AC current measurement in motor control, SMPS, over-current protection, and load management systems under real-world PCB layout and thermal conditions.

Technical Context

The EVCS1802-S-30-00A implements the MCS180XGS-30 IC in SOIC-8 package, featuring a monolithic integrated conductor path with 0.9 mΩ resistance and differential Hall sensing architecture that rejects external magnetic interference. It operates at 3.3 V supply and delivers ratiometric output voltage centered at 0.5 × VCC (1.65 V) with ±30 A full-scale range.

Bandwidth is configurable via external capacitor C4 (default open), supporting up to 100 kHz signal response; output rise time is ≤4 μs. The board includes decoupling capacitors (C1 = 0.1 µF, C2 = 4.7 µF), screw terminals for IP+/IP−, and test points for VOUT, VCC, and GND.

Key Specifications

Availability

EVCS1802-S-30-00A 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, traceable sourcing, and documented evaluation board revision history (Rev. 1.1, May 2021).

Supply support for EVCS1802-S-30-00A 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 EVCS1802-S-30-00A belongs to MPS's current sensor evaluation platform family, engineered to accelerate design-in of isolated Hall-effect sensing solutions for industrial and automotive-grade current measurement applications.

FAQ

What is the primary current rating and supply voltage for EVCS1802-S-30-00A?

This evaluation board is configured for the MCS180XGS-30 sensor, supporting ±30 A primary current sensing at a fixed 3.3 V supply voltage. It does not support 5 V operation-only the EVCS1801/1803 variants are rated for 5 V. The board's VCC input must be regulated 3.3 V ±5%.

How is galvanic isolation achieved on this board?

Isolation is inherent to the MCS180XGS-30 IC: the primary current flows through an internal copper conductor (IP+/IP− pins), while the sensing circuitry (VOUT, VCC, GND, FILT) resides on a separate, electrically isolated die region. Creepage and clearance meet reinforced insulation requirements per IEC 60747-17, with 3.7 kVRMS isolation rating.

Can I modify the bandwidth, and how?

Yes-bandwidth is set by capacitor C4 (unpopulated by default). Installing a capacitor (e.g., 1 nF–100 nF) between VOUT and GND lowers bandwidth per the sensor's internal transimpedance amplifier response. With C4 open, bandwidth is 100 kHz; with 10 nF, it drops to ~10 kHz, reducing high-frequency noise susceptibility.

What are the primary conductor connection options?

The board provides 4-pin screw terminals (Keystone 8191K-ND) labeled IP+ and IP−, rated for 12 AWG wire and 15 A continuous current. These connect directly to the internal conductor path of the MCS180XGS-30. No soldering or PCB trace routing is required-the terminals are mechanically and electrically optimized for low-inductance, low-resistance current injection.

Does this board include filtering components for EMI suppression?

It includes C1 (0.1 µF, 0603) and C2 (4.7 µF, 0805) for VCC decoupling near the IC, plus pads for optional C3 (filter cap) and C4 (bandwidth-setting cap). No common-mode chokes or ferrite beads are populated; external filtering must be added at system level if required for CISPR-25 or EN 55032 compliance.

Is the output voltage truly ratiometric, and how does that affect accuracy?

Yes-VOUT = 0.5 × VCC + (44 mV/A × IP). Since the 1.65 V zero-current offset and sensitivity scale with VCC, supply voltage drift directly impacts absolute accuracy. For <0.5% total error, VCC regulation must be better than ±10 mV; using a precision 3.3 V LDO is recommended over switching regulator outputs.

What is the thermal performance under full-scale current?

At ±30 A, the internal 0.9 mΩ conductor dissipates 0.81 W (I²R), raising board temperature ~15°C above ambient in still air. The SOIC-8 package and copper pour on the primary path provide adequate thermal dissipation for intermittent use; continuous operation requires airflow or heatsinking per MPS AN-127 thermal guidelines.