Monolithic Power Systems Inc. EV156-J-00A

Overview

EV156-J-00A from Monolithic Power Systems is an evaluation board for the MP156GJ primary-side off-line regulator IC, supporting buck, buck-boost, and flyback topologies with integrated 500V MOSFET, <30mW no-load power consumption, up to 3W output, and green-mode operation for home appliance standby power supplies.

For engineers reviewing the EV156-J-00A datasheet, EV156-J-00A pinout, EV156-J-00A application, or EV156-J-00A equivalent, this board enables rapid validation of MP156GJ-based AC/DC converters under 85–265VAC input, 12V/150mA output, surge immunity (1kV), and thermal/overload protection behavior in real-world low-power offline designs.

Technical Context

The EV156-J-00A implements a complete reference design for MP156GJ, configured as a flyback converter delivering 12V/150mA output from universal AC input (85–265VAC). It integrates all critical passive components-including two 2.2mH inductors (744741222 and 7447720222), 10µF/400V and 4.7µF/400V bulk capacitors, and 1N4007/1N4148WS diodes-to validate primary-side regulation without optocoupler feedback.

Board-level protections include timer-based overload protection, short-circuit response, open-loop detection, and thermal shutdown with auto-restart-mirroring MP156GJ's internal safety architecture. Surge performance is verified at 1kV using C3 (10µF) and C4 (4.7µF) electrolytic capacitors per Table 1 in the reference document.

Key Specifications

Availability

EV156-J-00A is available at Aetrix Electronics and suitable for home appliance standby power, industrial control auxiliary supplies, and white goods low-power AC/DC conversion requiring stable component supply and fast design validation cycles.

Supply support for EV156-J-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, AC/DC, LED drivers, and motor drivers.

The MP156 product line delivers primary-side regulated off-line controllers targeting cost-sensitive, energy-efficient low-power adapters and auxiliary supplies-designed to eliminate optocouplers while maintaining tight CV accuracy across load and line variations.

FAQ

What topology does the EV156-J-00A implement?

The EV156-J-00A implements a flyback topology using the MP156GJ primary-side controller. It is configured for 12V/150mA output from 85–265VAC input, with no optocoupler, and validated for efficiency, surge immunity (1kV), and protection features including OLP, SCP, and thermal shutdown with auto-restart.

Can the EV156-J-00A be used for buck or buck-boost configurations?

Yes-the MP156GJ IC on the board supports buck, buck-boost, and flyback topologies. While EV156-J-00A is shipped as a flyback reference design, its schematic and layout allow reconfiguration to buck or buck-boost by modifying transformer/inductor placement, feedback network, and snubber components per MP156 datasheet guidelines.

What is the maximum output power demonstrated on this board?

The EV156-J-00A is tested and characterized at 12V/150mA (1.8W), within MP156GJ's rated 3W maximum output capability. Output power can be scaled up to ~3W by adjusting transformer turns ratio, output capacitor ESR, and thermal management-subject to compliance with safety spacing and surge requirements.

Does the board include input surge protection components?

Yes-the board includes C3 (10µF/400V) and C4 (4.7µF/400V) electrolytic capacitors specifically selected to pass 1kV line-to-line surge testing per Table 1 in the reference document. No external MOV or TVS is required for basic surge compliance at this level.

Is the MP156GJ IC on the board replaceable with other package variants?

Yes-the MP156GJ uses TSOT23-5 packaging, and the board's footprint matches that variant exclusively. The SOIC8 version (MP156DJ) is not pin-compatible and requires PCB redesign. Replacement must retain identical thermal pad layout and gate drive loop integrity to maintain stability and EMI performance.

How is output voltage set on the EV156-J-00A?

Output voltage is set by the primary-side regulation algorithm inside MP156GJ, which samples reflected auxiliary winding voltage during demagnetization. No secondary-side feedback resistors are present-the 12V output is fixed by transformer turns ratio (N_sec/N_aux) and internal reference (2.5V), per MP156's primary-side CV control architecture.