Analog Devices Inc./Maxim Integrated MAXREFDES113B#

Overview

MAXREFDES113B# from Maxim Integrated is an isolated 24V-to-12V, 20W flyback reference design board featuring the MAX17596 peak-current-mode controller, compact 20mm × 35mm PCB footprint, through-hole mounting pins, and Sumida transformer model 13324-T115. It delivers 12V at up to 1.6A (20% over-range), ±5% output accuracy, and 87% peak efficiency at 24V input - optimized for industrial PLC and process control power rails.

For engineers reviewing the MAXREFDES113B# datasheet, MAXREFDES113B# pinout, MAXREFDES113B# application, or MAXREFDES113B# equivalent, this page provides verified board-level specifications, transformer-sourced isolation details, measured efficiency/ripple/transient performance, and integration guidance for rapid prototyping in harsh-environment 24V-input systems.

Technical Context

The MAXREFDES113B# implements a wide-input (17V–36V) flyback topology using the MAX17596 controller with programmable 200kHz switching frequency, internal 1% reference amplifier, and integrated EN/UVLO + OVI protection. It uses a Sumida 13324-T115 transformer qualified for 3000V functional insulation and 12V/1.6A output regulation.

Feedback employs a TL431 shunt regulator and optocoupler for isolated voltage sensing; soft-start is capacitor-programmed; hiccup-mode OCP and thermal shutdown ensure fault robustness. Input-to-output creepage/clearance meets industrial safety requirements per layout and transformer selection.

Key Specifications

Availability

MAXREFDES113B# is available at Aetrix Electronics and suitable for industrial PLCs, process control sensors, and telecom power supplies requiring stable component supply, pre-validated isolation, and rapid hardware integration.

Supply support for MAXREFDES113B# 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 reference design series targets engineers needing fully validated, production-ready power architectures - specifically isolated DC-DC converters with qualified magnetics, tested efficiency, and complete design files for accelerated development.

FAQ

What is the primary function of the MAXREFDES113B#?

The MAXREFDES113B# is a fully assembled, tested reference design board that implements an isolated 24V-to-12V, 20W flyback power supply. It uses the MAX17596 controller and Sumida 13324-T115 transformer to deliver 12V at up to 1.6A with 3000V functional isolation. The MAXREFDES113B# is intended for evaluation, prototyping, and direct integration into industrial control systems where validated isolation and compact size are critical.

Which transformer is used on the MAXREFDES113B# board?

The MAXREFDES113B# board is configured with the Sumida 13324-T115 transformer, as specified in Maxim's official ordering information. This transformer is qualified for 3000V functional insulation, supports the 200kHz switching frequency, and enables the 12V/1.6A output with high efficiency. Other variants (e.g., MAXREFDES113A#/C#/D#) use different transformers, but the MAXREFDES113B# is uniquely paired with Sumida 13324-T115.

Does the MAXREFDES113B# include input undervoltage and overvoltage protection?

Yes, the MAXREFDES113B# implements both input undervoltage lockout (UVLO) and overvoltage input (OVI) protection via the MAX17596 controller. UVLO is set to 17V turn-on threshold, ensuring reliable startup under brownout conditions; OVI is set to 36V, causing immediate shutdown if exceeded. These protections are resistor-programmed on-board and verified per Maxim's lab measurements.

What is the measured efficiency and output ripple of the MAXREFDES113B#?

The MAXREFDES113B# achieves 87% peak efficiency at 24V input and full 1.6A load, as confirmed in Maxim's lab testing. Output ripple is measured at ≤120mVpp under 800mA load (Figure 3), with transient response settling within ±5% window in <100µs when stepping between 960mA and 1600mA loads. All measurements reflect actual board performance with the Sumida 13324-T115 transformer.

How is the MAXREFDES113B# mechanically integrated into a system?

The MAXREFDES113B# features through-hole mounting pins on its bottom side, spaced 15.24mm (0.6in) between power and ground, and 27.94mm (1.1in) between input and output sides - enabling direct solder-mounting onto host PCBs without adapters. Its 20mm × 35mm footprint and standardized pin layout simplify mechanical integration into industrial enclosures and control modules requiring isolated auxiliary power.