Monolithic Power Systems Inc. EVCS1823-Q-350BRN-00A

Overview

EVCS1823-Q-350BRN-00A from Monolithic Power Systems is an evaluation board for the MCS1823GQTE series linear Hall-effect current sensor, supporting ±50 A bidirectional DC/AC sensing at 3.3 V supply, with 26.4 mV/A typical sensitivity and ±50 A over-current detection trigger, used in motor drive current monitoring and power supply protection circuits.

For engineers reviewing the EVCS1823-Q-350BRN-00A datasheet, EVCS1823-Q-350BRN-00A pinout, EVCS1823-Q-350BRN-00A application, or EVCS1823-Q-350BRN-00A equivalent, this board enables rapid validation of galvanically isolated current measurement, ratiometric/absolute output modes, and fast OCD response in industrial inverters and battery management systems.

Technical Context

The EVCS1823-Q-350BRN-00A implements a differential Hall array to reject stray magnetic fields and integrates the MCS1823GQTE-350BRN current sensor in TQFN-12 (3 mm × 3 mm). It supports 3.3 V supply only and delivers absolute-output VOUT = 1.65 V + 26.4 mV/A × IP across ±50 A range.

OCD functionality provides open-drain /OCD output asserting low when primary current exceeds ±50 A, with <10% error and hysteresis confirmed in test waveforms. The board uses discrete 0603 decoupling (C1) and pull-up (R1) components to stabilize VCC and /OCD signaling.

Key Specifications

Availability

EVCS1823-Q-350BRN-00A is available at Aetrix Electronics and suitable for motor control validation, power supply fault protection, and battery pack current monitoring requiring stable component supply and rapid prototyping support.

Supply support for EVCS1823-Q-350BRN-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 MCS1823 product line delivers ultra-small, isolated current sensing solutions targeting space-constrained industrial motor drives, server PSUs, and renewable energy inverters where accuracy, speed, and creepage/clearance compliance are critical.

FAQ

What is the primary function of the EVCS1823-Q-350BRN-00A evaluation board?

This board demonstrates the MCS1823GQTE-350BRN linear Hall-effect current sensor, enabling engineers to validate ±50 A bidirectional current measurement, absolute-output voltage scaling (1.65 V ± 1.32 V), and over-current detection response under real-world load conditions using standard lab equipment.

Does the board support both 3.3 V and 5 V operation?

No - the EVCS1823-Q-350BRN-00A is configured exclusively for 3.3 V supply, as indicated by its part number suffix "350BRN" and confirmed in the Evaluation Board Basic Information table. The 5 V variants (e.g., EVCS1823-Q-550BRN-00A) use different internal resistor networks and calibration.

How is over-current detection implemented on this board?

The /OCD pin is an open-drain output that pulls low when primary current exceeds ±50 A. It features built-in hysteresis to prevent chatter near threshold and requires an external pull-up resistor (R1 = 10 kΩ) to VCC, as shown in the schematic and BOM.

Can this evaluation board be used for AC current sensing?

Yes - the underlying MCS1823GQTE-350BRN sensor supports both AC and DC current sensing due to its linear Hall architecture and bandwidth exceeding 100 kHz. The board's layout and component selection preserve signal integrity for frequencies up to the sensor's specified bandwidth.

What is the role of the differential Hall array on the MCS1823 IC?

The differential Hall array cancels common-mode stray magnetic fields by measuring field gradients rather than absolute flux, improving immunity to external EMI and enabling accurate current measurement in noisy environments like motor drives and switch-mode power supplies.

Is galvanic isolation provided between the current path and signal circuitry?

Yes - the MCS1823 IC provides reinforced galvanic isolation between the primary conductor (IP+, IP−) and secondary signal pins (VOUT, /OCD, VCC, GND), rated to 2.4 kVRMS per UL 62368-1, eliminating need for external isolators in most industrial applications.