Analog Devices Inc./Maxim Integrated MAXREFDES112C#

Overview

MAXREFDES112C# 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) with peak efficiency of 88%, functional insulation, and through-hole mounting for rapid prototyping in industrial control systems.

For engineers reviewing the MAXREFDES112C# datasheet, MAXREFDES112C# pinout, MAXREFDES112C# application, or MAXREFDES112C# equivalent, key selection criteria include input voltage range (17–36V), programmable 500kHz switching frequency, hiccup-mode overcurrent protection, soft-start capability, and qualified transformer compatibility (HanRun HR051075).

Technical Context

The MAXREFDES112C# implements a wide-input (17V–36V), isolated flyback topology using the MAX17596 controller with internal 1% reference and programmable frequency (100kHz–1MHz). It employs a TL431-based optocoupled feedback loop across 3000V isolation for precise 12V regulation.

Protection features include EN/UVLO (17V turn-on), OVI (36V shutdown), soft-start via SS pin capacitor, hiccup-mode overcurrent response, and thermal shutdown-ensuring robust operation under brownout, overvoltage, and overload conditions in harsh industrial environments.

Key Specifications

Availability

MAXREFDES112C# is available at Aetrix Electronics and suitable for industrial control and automation, PLC power rails, and process instrumentation requiring stable component supply and rapid integration into embedded systems.

Supply support for MAXREFDES112C# 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.

The MAXREFDES reference design series targets engineers needing validated, production-ready power architectures-this design specifically addresses compact, isolated 24V-to-12V conversion for space-constrained industrial subsystems.

FAQ

What is the input voltage range supported by the MAXREFDES112C#?

The MAXREFDES112C# operates over a 17V to 36V DC input range, enabling reliable function across industrial 24V nominal supplies including variations due to cable drop or battery float. This range is enforced by the MAX17596's EN/UVLO and OVI circuits, set to 17V startup and 36V shutdown respectively in the MAXREFDES112C# layout.

Which transformer is qualified for use with the MAXREFDES112C#?

The MAXREFDES112C# is qualified with the HanRun HR051075 transformer, as explicitly listed in the design documentation. This transformer meets the turns ratio, leakage inductance, and isolation requirements needed for stable 12V/800mA operation at 500kHz switching frequency.

Does the MAXREFDES112C# provide galvanic isolation?

Yes, the MAXREFDES112C# provides functional galvanic isolation rated at 3000V_RMS, implemented via a 3000V optocoupler in the feedback path and the isolation barrier of the HR051075 transformer. This meets safety requirements for industrial signal conditioning and PLC I/O power domains.

What protection features are integrated into the MAXREFDES112C# design?

The MAXREFDES112C# integrates EN/UVLO (17V start), input overvoltage shutdown (36V), hiccup-mode overcurrent protection, thermal shutdown, and soft-start via the MAX17596 controller. These ensure safe startup, fault containment, and reliability during line transients or load faults without external supervision circuitry.

How is the MAXREFDES112C# physically mounted and interfaced?

The MAXREFDES112C# features through-hole pins on its bottom side for direct solder-mount integration-input pins (VIN, GND) and output pins (VOUT, GNDO) are spaced 0.6in apart (power-to-ground) and 2in apart (input-to-output)-enabling quick mechanical and electrical connection to host PCBs without adapters or cables.