Monolithic Power Systems Inc. EV175-S-00A

Overview

EV175-S-00A from Monolithic Power Systems is a universal-input, 10W buck topology evaluation board built around the MP175GS primary-side constant-voltage regulator IC. It delivers a regulated 18V/550mA output, supports 85–265VAC input, meets EN55022 conducted EMI limits, and provides multi-protection including SCP, OLP, OTP, and open-loop protection - validated for home appliance standby power applications.

For engineers reviewing the EV175-S-00A datasheet, EV175-S-00A pinout, EV175-S-00A application, or EV175-S-00A equivalent, this board enables rapid validation of MP175-based primary-side CV designs with verified surge immunity (1kV IEC61000-4-5), efficiency up to 87%, and production-ready BOM using SOIC-8 packaging and discrete passive selection per MPS reference design.

Technical Context

The EV175-S-00A implements a non-isolated buck converter using the MP175GS - an integrated 700V MOSFET controller with peak-current control, frequency foldback, and VCC auxiliary supply circuitry. Its primary-side regulation eliminates optocoupler and secondary-side feedback components.

Input filtering uses a π-network (C6–L1–C5) for EN55022 compliance; output filtering combines low-ESR electrolytic (C8) and ceramic (C7) capacitors. Protection logic responds to overcurrent within 400ms (OLP/SCP recovery) and includes VCC UVLO and thermal shutdown.

Key Specifications

Availability

EV175-S-00A is available at Aetrix Electronics and suitable for home appliance standby power, industrial control auxiliary supplies, and consumer electronics low-power AC/DC conversion requiring stable component supply and reference design validation.

Supply support for EV175-S-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 analog and power ICs, with emphasis on energy-efficient DC/DC and AC/DC solutions for consumer, industrial, and computing markets.

The EV175-S-00A belongs to MPS's evaluation board portfolio for primary-side regulation ICs, designed specifically to accelerate development of cost-sensitive, low-component-count AC/DC converters targeting white goods and standby power systems.

FAQ

What input voltage range does the EV175-S-00A support?

The EV175-S-00A accepts 85–265VAC input, enabling operation across North American (120V), European (230V), and Asian (220V) mains standards without hardware modification. Input rectification is handled by the MB6S bridge (BD1), and filtering is implemented via C6, L1, and C5 per EN55022 requirements.

Does the board provide isolated or non-isolated output?

The EV175-S-00A delivers a non-isolated 18V output referenced to the same ground as the AC input return. It uses primary-side regulation (MP175GS) without optocouplers or secondary-side feedback, making it unsuitable for safety-isolated applications but optimal for cost-sensitive internal auxiliary rails.

How is output voltage set and trimmed?

Output voltage is set by the R1–R2 resistor divider (95.3kΩ / 14.3kΩ) feeding the FB pin of U1 (MP175GS). The 1μF sample-hold capacitor (C1) stabilizes feedback sampling. No trim pot is included; adjustment requires replacing R1 or R2 per MP175GS feedback equation: VOUT = 1.215 × (1 + R1/R2).

What protections are implemented and how do they behave?

The board implements SCP (short-circuit), OLP (overload), OTP (over-temperature), open-loop, and VCC UVLO. Under overload, recovery occurs after ~400ms; SCP triggers immediate shutdown with auto-restart. Thermal protection disables switching above 150°C junction temperature, with hysteresis for safe restart.

Can this board be used for continuous operation or only lab evaluation?

The EV175-S-00A is rated for continuous operation at 550mA output under proper ventilation and ambient ≤40°C. Its PCB layout, component derating (e.g., 600V diodes, 400V input caps), and thermal design align with production-grade implementation - though agency certification (UL/CE) is not granted for the bare board.

Which IC is mounted on the board and what package does it use?

The board integrates the MP175GS - a primary-side constant-voltage regulator with integrated 700V MOSFET - in an SOIC-8 package (U1). Pinout matches the MP175GS datasheet: DRAIN (pins 5–8), VCC (pin 1), FB (pin 2), AGND (pin 3), PGND (pin 4), with pins 6–8 paralleled for current handling.

Is EMI filtering integrated, and does it meet regulatory limits?

Yes - the board includes a complete π-filter (C6–L1–C5) on the AC input and optimized PCB layout to meet EN55022 Class B conducted emissions limits. Test data (page 9 of Rev.1.0) confirms compliance on both live and neutral lines across 150kHz–30MHz, with peak and average measurements provided.