Monolithic Power Systems Inc. EVHR1203-Y-00A

Overview

EVHR1203-Y-00A from Monolithic Power Systems is a 240W general-purpose evaluation board designed to demonstrate the HR1203 digital PFC + half-bridge LLC combo controller in AC/DC power supplies. It delivers 12V/20A constant output across 90–265VAC input, supports adaptive dead-time adjustment (ADTA), anti-capacitive mode protection, and achieves up to 93% efficiency with >0.9 PF at light load.

For engineers reviewing the EVHR1203-Y-00A datasheet, EVHR1203-Y-00A pinout, EVHR1203-Y-00A application, or EVHR1203-Y-00A equivalent, this board enables rapid validation of high-efficiency, low-no-load-power PC/ATX, gaming, and adapter power designs compliant with EuP Lot 6, CoC v5 Tier 2, IEC61000-3-2 Class C, and EN55022 standards.

Technical Context

The EVHR1203-Y-00A implements a complete 240W AC/DC reference design centered on the HR1203GY SOIC-28 IC, integrating a digitally controlled average-current-mode PFC stage and an adaptive ZVS-enabled LLC resonant converter. Its PFC operates in both CCM and DCM based on real-time input voltage and load conditions.

The board's LLC stage uses a custom PQ3230 transformer (LP = 0.65mH, N1:N2:N3:N4:N5 = 48:5:5:3:3) and EE20 resonant inductor (80μH), enabling robust zero-voltage switching from full load to no load via ADTA, while preventing capacitive-mode operation through integrated protection logic.

Key Specifications

Availability

EVHR1203-Y-00A is available at Aetrix Electronics and suitable for PC/ATX power supplies, gaming adapters, and all-in-one AC/DC power supply development requiring stable component supply, fast prototyping cycles, and regulatory-compliant reference validation.

Supply support for EVHR1203-Y-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, with expertise in integrated PFC, resonant control, and high-efficiency DC/DC conversion.

This evaluation board belongs to MPS's HR-series high-power AC/DC reference platform, engineered specifically to accelerate adoption of digitally controlled, ultra-low-no-load-power power supply architectures for computing and consumer applications.

FAQ

What is the primary IC used on the EVHR1203-Y-00A board?

The board is built around the HR1203GY - a monolithic digital controller integrating both average-current-mode PFC and adaptive half-bridge LLC control in a single SOIC-28 package. It drives external MOSFETs (Q1–Q6) and manages full-system protection, including anti-capacitive mode detection and adaptive dead-time adjustment.

Does the EVHR1203-Y-00A support universal AC input?

Yes - it operates across 90–265VAC at 50Hz or 60Hz without hardware modification. The HR1203's dual-mode PFC automatically selects CCM or DCM based on instantaneous line voltage and load, ensuring consistent high PF and efficiency across the full input range.

What protections are implemented on this evaluation board?

The board provides overload protection (auto-restart), short-circuit protection (SCP, auto-restart), over-voltage protection (OVP), and anti-capacitive mode protection. These are enforced by the HR1203's internal logic and verified in test reports for startup, hold-up, and fault recovery behavior.

Can the EVHR1203-Y-00A be used for compliance testing?

It meets EN55022 Class B conducted emissions limits and IEC61000-3-2 Class C harmonic current requirements when tested per standard configurations. However, final system-level certification requires integration into end-product mechanical enclosures and layout-specific validation per applicable standards.

Is thermal performance data available for this board?

Yes - thermal test results (Rev. 1.0, p.14) show surface temperature measurements under 90VAC/240W full load at 33°C ambient, no airflow, using 2oz copper PCB. Key hotspots include the PFC MOSFET (Q1), LLC half-bridge (Q3/Q6), and resonant inductor (L6), all within safe operating limits.

What are the physical dimensions and mounting features?

The board measures 17.4 cm × 10.55 cm × 3.5 cm (L×W×H) and includes screw-mounting holes, 2mm pitch input/output connectors (L, N, Earth, VOUT, GND), and clearly labeled test points for VBUS, gate drive signals, and output ripple measurement.