Monolithic Power Systems Inc. EVQ4590-S-00A

Overview

EVQ4590-S-00A from Monolithic Power Systems is a universal-input, non-isolated off-line buck evaluation board built around the MPQ4590GS primary-side constant-voltage regulator IC. It delivers 12 V / 300 mA (3.6 W) output from 120–600 V_DC input, features integrated 600 V / 13.5 Ω MOSFET, achieves >75% full-load efficiency, and meets EN55022 conducted EMI and IEC61000-4-5 surge immunity for industrial and automotive PTC heater applications.

For engineers reviewing the EVQ4590-S-00A datasheet, EVQ4590-S-00A pinout, EVQ4590-S-00A application, or EVQ4590-S-00A equivalent, this board enables rapid validation of primary-side CV control in high-input-voltage buck topologies-particularly where optocoupler-free regulation, low no-load power (<100 mW), and multi-protection safety (SCP, OLP, OTP, UVLO) are critical to design integrity.

Technical Context

The EVQ4590-S-00A implements a fixed-frequency peak-current-controlled buck converter using primary-side sensing, eliminating secondary feedback components. Its MPQ4590GS controller integrates a 600 V MOSFET and internal high-voltage current source for V_CC startup, enabling direct rectified AC line operation without auxiliary winding.

Designed specifically for universal DC input (120–600 V), the board uses π-filtering (C4/FB1/C5) for EN55022 compliance, ceramic + electrolytic output staging (C6/C7) for ripple suppression, and resistor-divider feedback (R1/R4) with sample-hold capacitor C1 to realize accurate 12 V ±5% regulation under load and line variation.

Key Specifications

Availability

EVQ4590-S-00A is available at Aetrix Electronics and suitable for automotive PTC heater controls, industrial standby power supplies, and electric/hybrid vehicle auxiliary power modules requiring stable component supply, fast prototyping cycles, and regulatory-compliant reference designs.

Supply support for EVQ4590-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions for automotive, industrial, and consumer markets.

The MPQ4590 product line delivers primary-side constant-voltage regulation for non-isolated off-line converters-designed to replace optocoupler-based feedback in cost-sensitive, space-constrained, and high-reliability applications like automotive cabin heaters and industrial control logic supplies.

FAQ

What input voltage configurations does the EVQ4590-S-00A support?

The board accepts 120–600 V_DC input, corresponding to rectified universal AC mains (e.g., 100–240 V_AC) and high-voltage DC bus systems (e.g., 400 V_DC in EV architectures). It does not accept AC directly-external bridge rectification is required before VIN connection.

Can the EVQ4590-S-00A be used in isolated topologies?

No-the EVQ4590-S-00A is configured exclusively as a non-isolated buck regulator and demonstrates the MPQ4590's primary-side CV capability in that topology. While the MPQ4590 IC supports flyback, boost, and buck-boost, this specific board lacks isolation components (e.g., transformer, optocoupler) and is not certified for isolated use.

What protections are implemented on the EVQ4590-S-00A board?

The board inherits all MPQ4590GS protections: over-current (OLP), short-circuit (SCP), thermal shutdown (OTP), V_CC under-voltage lockout (UVLO), and open-loop protection. These are active during operation and verified in test reports across input and load ranges.

Is the EVQ4590-S-00A agency-certified for safety standards?

No-this is an engineering prototype evaluation board. MPS explicitly states it has not undergone agency approval (e.g., UL, CE). Users must employ isolation transformers during testing and integrate final designs into certified end-equipment per applicable safety standards.

How is output voltage accuracy maintained without secondary feedback?

Accuracy relies on primary-side CV control using sample-hold capacitor C1 and resistor divider (R1/R4) to reconstruct output voltage. The MPQ4590GS compensates for diode forward drop and transformer leakage (in supported topologies), achieving ±5% regulation at 12 V under full load and line variation.

What is the physical size and mounting configuration of the board?

The EVQ4590-S-00A measures 68 mm × 28 mm × 17 mm (L×W×H) and uses through-hole and surface-mount components on a single-sided PCB. It features two 2-pin screw terminals (VIN/GND and VOUT/GND) and no mounting holes-intended for benchtop evaluation with external cabling.