Analog Devices Inc./Maxim Integrated MAXREFDES112A#

Overview

MAXREFDES112A# from Maxim Integrated is an isolated 24V-to-12V, 10W flyback power supply reference design built around the MAX17596 peak-current-mode controller. It delivers 12V at up to 800mA (±5% output accuracy), achieves 88% peak efficiency at 24V input, and features functional insulation with through-hole mounting for rapid prototyping in industrial control systems.

For engineers reviewing the MAXREFDES112A# datasheet, MAXREFDES112A# pinout, MAXREFDES112A# application, or MAXREFDES112A# equivalent, this board-level solution provides verified layout files, Gerber data, BOM, transformer qualification (Wurth 750315882), and tested performance across line/load regulation, transient response, and EMI-compliant spread-spectrum operation.

Technical Context

The MAXREFDES112A# implements a wide-input (17–36V) isolated flyback topology using the MAX17596 controller, which integrates a 1% accurate internal voltage reference and programmable switching frequency (100kHz–1MHz; set to 500kHz here). It employs optocoupler-based feedback with TL431 for precise 12V output regulation under varying load conditions.

Protection features include EN/UVLO (17V startup), OVI (36V shutdown), soft-start via SS pin capacitor, hiccup-mode overcurrent protection, and thermal shutdown. Transformer selection is simplified by pre-qualification of four global vendors' parts-including Wurth 750315882 for this variant-ensuring reliable isolation and manufacturability.

Key Specifications

Availability

MAXREFDES112A# is available at Aetrix Electronics and suitable for industrial control and automation, programmable logic controller (PLC) auxiliary power, and isolated sensor interface power supplies requiring stable component supply and fast evaluation turnaround.

Supply support for MAXREFDES112A# 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.

The MAXREFDES series delivers fully validated, production-ready reference designs focused on solving common engineering challenges in isolated power conversion, signal conditioning, and system-level integration.

FAQ

What is the input voltage range supported by the MAXREFDES112A#?

The MAXREFDES112A# operates over a 17V to 36V DC input range. This accommodates standard 24V industrial supplies while providing robust undervoltage lockout (17V startup) and overvoltage protection (36V shutdown), ensuring reliable operation during line fluctuations and brownout events. The MAXREFDES112A# maintains regulation throughout this range.

What transformer is used on the MAXREFDES112A# board?

The MAXREFDES112A# uses the Wurth Electronics transformer part number 750315882. This part is pre-qualified for the design and provides the required turns ratio, isolation rating, and leakage inductance to meet efficiency, regulation, and safety targets. Other variants (e.g., MAXREFDES112B#) use different transformers, but the MAXREFDES112A# specifically integrates the Wurth 750315882.

Does the MAXREFDES112A# provide galvanic isolation between input and output?

Yes, the MAXREFDES112A# provides functional galvanic isolation via its flyback transformer and optocoupler-based feedback circuit. It achieves reinforced insulation capability suitable for industrial I/O and PLC auxiliary power applications where ground separation and noise immunity are critical. The MAXREFDES112A# does not claim safety-rated (e.g., UL/IEC 60950-1) isolation without additional certification testing.

What is the output current capability and accuracy of the MAXREFDES112A#?

The MAXREFDES112A# delivers up to 800mA continuously at 12V with ±5% output voltage accuracy across line, load, and temperature. It supports up to 960mA (20% overrange) in short-duration hiccup-limited conditions. Output accuracy is maintained by the MAX17596's 1% internal reference and precision TL431/optocoupler feedback network in the MAXREFDES112A# implementation.

Can the MAXREFDES112A# be used directly in a production system?

The MAXREFDES112A# is a fully assembled, tested reference design intended for evaluation and rapid prototyping. While it meets functional performance targets-including 88% peak efficiency and low output ripple-it requires system-level validation for EMI compliance, thermal management, and long-term reliability before production deployment. The MAXREFDES112A# provides all design files (Gerber, BOM, schematics) to support derivative production designs.