Analog Devices Inc./Maxim Integrated MAXREFDES116C#

Overview

MAXREFDES116C# from Maxim Integrated is an isolated 24V-to-5V, 40W (8A) industrial DC-DC reference design based on the MAX17599 active-clamp forward controller. It delivers peak efficiency of 91.5% at 24V input, features functional insulation, 350kHz switching with programmable frequency dithering, and fits on a compact 20mm × 70mm board for PLC and sensor power applications.

For engineers reviewing the MAXREFDES116C# datasheet, MAXREFDES116C# pinout, MAXREFDES116C# application, or MAXREFDES116C# equivalent, this page provides verified technical context, key specifications, supply availability, manufacturer background, and design-specific FAQs - all grounded in the official reference design documentation and test data.

Technical Context

The MAXREFDES116C# implements an active-clamp forward converter topology using the MAX17599 PWM controller, operating across 17V–36V input with fixed 5V/8A output. It employs zero-voltage switching via programmable dead-time between NDRV and AUXDRV outputs, and uses an auxiliary p-channel MOSFET (P1) with clamp capacitor C12 to reset transformer flux and reduce voltage stress on main switch N1.

Protection includes EN/UVLO (16.5V startup), OVI (37.0V shutdown), hiccup-mode overcurrent, soft-start, soft-stop clamp discharge, and thermal shutdown. Feedback uses TLV431B + optocoupler for 3000V isolation, and layout ensures 15.24mm creepage between power and ground, 50.8mm isolation barrier.

Key Specifications

Availability

MAXREFDES116C# is available at Aetrix Electronics and suitable for programmable logic controllers (PLCs), industrial process sensors, and telecom/datacom power supplies requiring stable component supply, rapid prototyping, and production-ready reference designs.

Supply support for MAXREFDES116C# 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 industrial power-system developers, delivering fully validated, Gerber-ready solutions built around Maxim's robust controllers like the MAX17599 - enabling fast evaluation and reliable deployment of isolated DC-DC converters.

FAQ

What is the input voltage range supported by the MAXREFDES116C#?

The MAXREFDES116C# operates across a 17V to 36V DC input range, with EN/UVLO set to 16.5V startup and OVI protection triggered at 37.0V. This range accommodates nominal 24V industrial supplies including transient overvoltage and brownout conditions, as verified in lab testing per the official reference design documentation.

What output voltage and current does the MAXREFDES116C# deliver?

The MAXREFDES116C# delivers a regulated 5V ±0.25V output at up to 8A (40W). Output stability and ripple were measured under full load (8A) at 24V input, confirming compliance with industrial power requirements for PLC I/O and sensor interfaces.

Does the MAXREFDES116C# include isolation, and what is its rating?

Yes, the MAXREFDES116C# provides reinforced functional isolation with a 3000V RMS rating. Isolation is implemented via a 3000V optocoupler in the feedback path and physical 50.8mm separation between input and output sections - meeting safety requirements for industrial process control equipment.

What topology and controller are used in the MAXREFDES116C# design?

The MAXREFDES116C# uses an active-clamp forward converter topology centered on the MAX17599 current-mode PWM controller. The design leverages the MAX17599's AUXDRV output to drive a p-channel clamp switch, enabling zero-voltage switching, reduced voltage stress, and elimination of snubber losses.

What protections are implemented on the MAXREFDES116C# board?

The MAXREFDES116C# integrates EN/UVLO (16.5V startup), input overvoltage lockout (37.0V), hiccup-mode overcurrent protection, thermal shutdown, soft-start, and soft-stop clamp capacitor discharge - all confirmed in the reference design's circuit description and lab validation reports.