Analog Devices Inc./Maxim Integrated MAXREFDES113A#

Overview

MAXREFDES113A# from Maxim Integrated is an isolated 24V-to-12V, 20W flyback reference design board featuring the MAX17596 peak-current-mode controller, 20mm × 35mm PCB footprint, ±5% output voltage accuracy, and 87% peak efficiency at 24V input. It delivers 12V/1.6A with 20% over-range current capability and supports transformer selection from Wurth Electronics (750316112r01).

For engineers reviewing the MAXREFDES113A# datasheet, MAXREFDES113A# pinout, MAXREFDES113A# application, or MAXREFDES113A# equivalent, this page provides verified board-level specifications, isolation implementation details, transformer compatibility, efficiency curves, transient response data, and integration-ready mechanical dimensions.

Technical Context

The MAXREFDES113A# implements a wide-input (17V–36V) flyback topology using the MAX17596 controller with programmable 200kHz switching frequency, internal 1% reference amplifier, and hiccup-mode overcurrent protection. It uses a TL431-based optocoupled feedback loop with 3000V isolation for precise 12V regulation.

Input undervoltage lockout (EN/UVLO) is set to 17V and overvoltage protection (OVI) to 36V via resistor divider (R5=280kΩ, R6=13kΩ, R7=10kΩ). Soft-start is implemented via capacitor on SS pin to limit inrush current during startup.

Key Specifications

Availability

MAXREFDES113A# is available at Aetrix Electronics and suitable for industrial control and automation, PLC power rails, and telecom/datacom isolated auxiliary supplies requiring stable component supply, quick prototyping, and transformer-sourcing flexibility.

Supply support for MAXREFDES113A# 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 applications.

The MAXREFDES reference design series targets rapid deployment of validated, production-ready power architectures - specifically isolated DC-DC converters with pre-qualified transformers and complete design files.

FAQ

What is the input voltage range supported by the MAXREFDES113A#?

The MAXREFDES113A# supports an input voltage range of 17V to 36V DC, enabling reliable operation across industrial 24V systems with brownout and overvoltage margins. This range is enforced by the MAX17596's EN/UVLO and OVI circuitry, configured via external resistors to initiate startup at 17V and shut down at 36V. The MAXREFDES113A# is rated for nominal 24V input operation.

Does the MAXREFDES113A# include isolation, and what is its isolation rating?

Yes, the MAXREFDES113A# provides functional galvanic isolation between input and output via a transformer-based flyback architecture. Its feedback path uses a 3000V isolation-rated optocoupler (e.g., PC817 or equivalent), and the transformer itself is qualified to meet reinforced insulation requirements per IEC 60950-1. The MAXREFDES113A# is not certified to UL/CSA safety standards out-of-box but meets key isolation performance benchmarks.

Which transformer is included with the MAXREFDES113A# board?

The MAXREFDES113A# ships with the Wurth Electronics 750316112r01 transformer pre-installed. This transformer is fully qualified for the design and supports the required 17V–36V input range, 12V/1.6A output, and 200kHz switching frequency. Other qualified alternatives include Sumida 13324-T115 (MAXREFDES113B#), HanRun HR051441 (MAXREFDES113C#), and Halo TGSP-P153EP13LF (MAXREFDES113D#).

What is the output voltage accuracy and regulation performance of the MAXREFDES113A#?

The MAXREFDES113A# delivers 12V output with ±5% accuracy over line, load, and temperature. Regulation is maintained via optocoupled feedback using a TL431 shunt regulator and precision resistor network. Load regulation is ≤±1.5% from no-load to full load (1.6A), and line regulation is ≤±0.5% across the 17V–36V input range - verified per lab measurements in the reference design documentation.

Can the MAXREFDES113A# be used in safety-critical industrial applications?

The MAXREFDES113A# is a reference design intended for evaluation and prototyping, not end-equipment certification. While it implements functional insulation and meets key performance metrics (e.g., 3000V optocoupler, transformer creepage/clearance), it lacks full safety agency certification (UL, CSA, VDE). For safety-critical use, system-level validation and additional safety components (e.g., Y-capacitors, reinforced insulation barriers) must be added - the MAXREFDES113A# serves as a validated starting point for such development.