Monolithic Power Systems Inc. EV103-N-00A

Overview

EV103-N-00A from Monolithic Power Systems is an evaluation board for the MP103 offline inductor-less linear regulator controller IC, designed to generate regulated 5 V DC bias power directly from 85–265 VAC mains without magnetic components. It supports BJT-based output stage implementation, delivers up to 60 mA output current, and achieves <100 mW standby power consumption per new energy standards.

For engineers reviewing the EV103-N-00A datasheet, EV103-N-00A pinout, EV103-N-00A application, or EV103-N-00A equivalent, this board enables rapid validation of MP103's adaptive VB-VOUT charging window operation, thermal shutdown behavior, and EMI performance in wall switches, Z-Wave/ZigBee home automation nodes, and low-power off-line standby supplies.

Technical Context

The EV103-N-00A implements the MP103GN SOIC8E controller in a fully assembled, tested reference design with discrete BJT (3DD4802A), input bridge (MB6S), NTC-based OTP (RT1), and TVS protection (RV). It operates using adaptive active charging of the VB node only during necessary conduction windows to minimize loss and meet stringent standby power requirements.

Output voltage is adjustable via resistor divider (R4/R5) per VOUT = 1.235 V × (1 + R5/R4); default configuration yields 5 V. Board-level testing confirms stable regulation across 85–265 VAC input, ≤10 mVpp output ripple at 60 mA, and compliance with conducted EMI limits on both L and N lines at 115 Vac and 230 Vac.

Key Specifications

Availability

EV103-N-00A is available at Aetrix Electronics and suitable for smart home wall switches, Z-Wave/ZigBee device development, and low-power off-line standby supply design requiring stable component supply, fast prototyping turnaround, and validated EMI performance.

Supply support for EV103-N-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 focus on efficiency, integration, and reliability in power management solutions.

The MP103 product line targets ultra-low-standby-power, inductor-less AC/DC bias generation for IoT edge devices-designed to replace traditional flyback or capacitive-dropper supplies with lower BOM cost and reduced EMI.

FAQ

What is the primary function of the EV103-N-00A evaluation board?

The EV103-N-00A is a fully assembled reference design that demonstrates the MP103 offline inductor-less linear regulator controller. It converts 85–265 VAC directly to a regulated 5 V DC output capable of delivering 60 mA, targeting low-power standby applications where magnetic components are undesirable.

Can the output voltage be adjusted, and how?

Yes. Output voltage is set by the R4/R5 resistor divider on the board per VOUT = 1.235 V × (1 + R5/R4). Default values (R4 = 30.9 kΩ, R5 = 10.2 kΩ) yield 5 V. Replacing R4 and R5 allows adjustment from 1.5 V to 15 V while maintaining regulation accuracy and stability.

Does the board include thermal protection, and how is it implemented?

Yes. The board implements external programmable over-temperature protection (OTP) using NTC thermistor RT1 (10 kΩ, 5%) connected to the MP103's TEMP pin. This enables system-level temperature monitoring and shutdown before the IC reaches its internal thermal shutdown threshold.

What protections are demonstrated on the EV103-N-00A board?

The board validates MP103's integrated protections: thermal shutdown (TSD), VB over-voltage protection (OVP), VB short-to-GND detection, over-load protection (OLP), and short-circuit protection (SCP). These are verified through load-step and fault-injection tests documented in the board's test report.

Is the EV103-N-00A RoHS-compliant and lead-free?

Yes. All components on the EV103-N-00A-including the MP103GN IC, MB6S diode, and passive parts-are lead-free and compliant with the RoHS directive. MPS confirms green status for this part family on its official Quality Assurance page.

How is EMI performance validated on this board?

Conducted EMI was measured per CISPR 22 on both line (L) and neutral (N) paths at 115 Vac and 230 Vac. The board meets Class B limits without external filtering components-demonstrating the MP103's inherent low-noise switching architecture and optimized PCB layout per Figures 1–4 in the reference design guide.