Monolithic Power Systems Inc. EV163-SE-00A

Overview

EV163-SE-00A from Monolithic Power Systems is a universal-input, dual-output non-isolated off-line regulator evaluation board built around the MP163AGSE-33 primary-side CV controller in SOIC-16. It implements a buck topology delivering 12V/70mA and 3.3V/50mA from 85–265VAC input, achieves <30mW no-load power consumption, meets IEC61000-4-5 (1kV) surge immunity and EN55022 conducted EMI, and integrates protections including SCP, OLP, TSD, and VCC UVLO.

For engineers reviewing the EV163-SE-00A datasheet, EV163-SE-00A pinout, EV163-SE-00A application, or EV163-SE-00A equivalent, this board enables rapid validation of MP163-based buck designs for cost-sensitive, non-isolated AC/DC conversion in white goods, industrial controls, and standby power systems with minimal external components.

Technical Context

The EV163-SE-00A implements a primary-side-controlled buck regulator using the MP163AGSE-33, which integrates a 700V MOSFET and eliminates optocoupler feedback. It operates in peak-current mode with frequency foldback and peak current compression to maintain regulation across universal AC input (50/60Hz).

Board-level design includes a π-filter (C4–L1–C5) for EN55022 compliance, VCC bootstrap via R3/C2/D1, output sampling via C1/R1/R2, and LDO enable control via SW1. The 12V rail uses electrolytic (C6) + ceramic (C7) output filtering; the 3.3V rail derives from an internal LDO powered by C9 and filtered by C8.

Key Specifications

Availability

EV163-SE-00A is available at Aetrix Electronics and suitable for home appliance power supplies, industrial control auxiliary rails, and consumer electronics standby converters requiring stable component supply, fast prototyping cycles, and pre-validated EMI performance.

Supply support for EV163-SE-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 over two decades of leadership in DC/DC, AC/DC, motor drivers, and battery management solutions.

The EV163-SE-00A belongs to MPS's primary-side regulation evaluation platform family, designed to accelerate adoption of their optocoupler-free, low-BOM-cost AC/DC controllers for cost-sensitive, non-isolated offline applications.

FAQ

What topologies does the EV163-SE-00A support?

The EV163-SE-00A is configured specifically as a buck regulator. While the underlying MP163 controller supports buck, buck-boost, boost, and flyback topologies, this board's layout, component selection (e.g., L1 = 1mH buck inductor), and schematic are fixed for buck operation only.

Can MP163B or MP163C be substituted on this board?

Yes - the board supports MP163B and MP163C variants per the quick start guide. However, inductor L2 must be replaced with a higher-current-rated unit (~1mH, ≥350mA), and output capacitor C6 should be enlarged to maintain acceptable ripple under increased load conditions.

How is the 3.3V output generated and controlled?

The 3.3V output is generated by an internal LDO within the MP163AGSE-33. Its enable signal (EN) is routed to SW1: when SW1 is ON, EN connects to the 12V rail to activate the LDO; when OFF, EN grounds to disable the 3.3V output. Filtering uses C9 (input) and C8 (output).

What safety precautions apply during testing?

Although designed to meet safety requirements, the EV163-SE-00A is an unapproved engineering prototype. All AC input testing must use an isolation transformer between the mains source and the board's L/N terminals to prevent electric shock and equipment damage.

Does this board include EMI filtering components?

Yes - it integrates a full π-filter (C4 = 3.3μF/400V, L1 = 1mH, C5 = 3.3μF/400V) on the AC input path, explicitly designed to meet EN55022 Class B conducted emissions limits without additional external filtering.

What is the role of C1, R1, and R2 in the feedback network?

C1 (100nF) acts as a sample-hold capacitor that stabilizes the sampled output voltage. R1 (71.5kΩ) and R2 (20kΩ) form a precision resistor divider that scales the 12V output to ~2.5V for the MP163's FB pin, enabling accurate primary-side constant voltage regulation without secondary-side sensing.