Analog Devices Inc./Maxim Integrated MAXREFDES113C#

Overview

MAXREFDES113C# from Maxim Integrated is an isolated 24V-to-12V, 20W flyback reference design board featuring the MAX17596 peak-current-mode controller, 12V ±5% output at 1.6A (20% over-range current), 87% peak efficiency at 24V input, and through-hole mounting for rapid system integration in industrial power applications.

For engineers reviewing the MAXREFDES113C# datasheet, MAXREFDES113C# pinout, MAXREFDES113C# application, or MAXREFDES113C# equivalent, this reference design delivers verified performance across 17–36V input range, 200kHz fixed switching frequency, hiccup-mode OCP, thermal shutdown, and programmable EN/UVLO/OVI protection - all on a compact 20mm × 35mm PCB.

Technical Context

The MAXREFDES113C# implements a transformer-isolated flyback topology using the MAX17596 controller with internal 1% reference amplifier and programmable 100kHz–1MHz switching frequency (set to 200kHz). It supports functional insulation and uses HanRun HR051441 transformer qualified per design.

Input protection includes EN/UVLO (17V turn-on) and OVI (36V shutdown), while output regulation relies on TL431 + optocoupler feedback across 3000V isolation barrier. Soft-start via SS pin capacitor limits inrush current, and hiccup-mode OCP + thermal shutdown ensure fault robustness.

Key Specifications

Availability

MAXREFDES113C# is available at Aetrix Electronics and suitable for industrial control and automation, PLC power rails, and telecom/datacom isolated DC-DC conversion requiring stable component supply and quick prototyping support.

Supply support for MAXREFDES113C# 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 high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications systems.

The MAXREFDES reference design series targets rapid evaluation and implementation of robust, pre-validated power architectures - specifically for isolated industrial DC-DC conversion where transformer qualification, safety compliance, and layout reproducibility are critical.

FAQ

What is the input voltage range supported by the MAXREFDES113C#?

The MAXREFDES113C# operates across a 17V to 36V DC input range, with EN/UVLO set to 17V turn-on and OVI protection triggered at 36V. This accommodates nominal 24V industrial supplies while allowing for line variation and brownout resilience. The MAXREFDES113C# has been tested and validated across this full range per its reference design documentation.

Which transformer is used on the MAXREFDES113C# board?

The MAXREFDES113C# uses the HanRun HR051441 transformer, as specified in Maxim's ordering information table. This transformer is fully qualified for the design and provides the required turns ratio, isolation rating, and leakage inductance to meet efficiency, transient response, and safety targets defined for the MAXREFDES113C#.

Does the MAXREFDES113C# provide output overcurrent protection?

Yes, the MAXREFDES113C# implements hiccup-mode overcurrent protection via the MAX17596 controller. When overcurrent is detected at the CS pin, the controller shuts down and restarts after a cooldown period - minimizing power dissipation during sustained faults. This behavior is confirmed in the MAXREFDES113C# lab measurements and circuit description.

What is the output voltage accuracy and regulation method of the MAXREFDES113C#?

The MAXREFDES113C# delivers 12V output with ±5% accuracy, achieved using a TL431 programmable shunt regulator and 3000V-isolation optocoupler in the secondary-side feedback loop. This closed-loop scheme ensures tight regulation across line, load, and temperature - verified in test reports for the MAXREFDES113C#.

Can the MAXREFDES113C# be used without modification in a 24V-input industrial system?

Yes, the MAXREFDES113C# is fully assembled, tested, and optimized for 24V nominal input operation - delivering 12V/1.6A with 87% peak efficiency and validated transient response. Its through-hole pins (15.24mm power-to-ground spacing, 27.94mm input-to-output spacing) enable direct mounting into host systems without layout changes, as confirmed in the MAXREFDES113C# Quick Start guide.