Analog Devices Inc./Maxim Integrated MAXREFDES114C#

Overview

MAXREFDES114C# from Maxim Integrated is an isolated 24V-to-5V, 10W (2A) industrial reference design board implementing an active-clamp forward converter topology with the MAX17599 PWM controller. It delivers peak efficiency of 92% at 24V input, features functional insulation, 330kHz switching frequency, and compact 20mm × 40mm PCB footprint. It targets PLC power rails requiring robust, low-EMI, transformer-isolated DC-DC conversion.

For engineers reviewing the MAXREFDES114C# datasheet, MAXREFDES114C# pinout, MAXREFDES114C# application, or MAXREFDES114C# equivalent, key selection criteria include input voltage range (17–36V), output regulation accuracy (5V ±0.25V), hiccup-mode overcurrent protection, soft-start/soft-stop control, and transformer vendor compatibility (Hanrun HR051441).

Technical Context

The MAXREFDES114C# implements a wide-input (17V–36V), isolated forward-converter architecture using the MAX17599 active-clamp current-mode PWM controller. It employs zero-voltage switching via programmable dead time between NDRV and AUXDRV outputs, and uses a Hanrun HR051441 transformer for galvanic isolation and flux-swing optimization.

Control features include EN/UVLO (16.5V turn-on), OVI shutdown (37.0V threshold), soft-start timing, hiccup-mode overcurrent protection, and thermal shutdown. The feedback loop uses TLV431B + optocoupler for precise 5V regulation under line/load transients.

Key Specifications

Availability

MAXREFDES114C# is available at Aetrix Electronics and suitable for programmable logic controllers (PLCs), industrial process control systems, and isolated sensor interface power supplies requiring stable component supply, traceable sourcing, and rapid prototyping support.

Supply support for MAXREFDES114C# 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 delivers fully validated, production-ready power architectures - this line focuses on isolated industrial DC-DC solutions with emphasis on reliability, EMI control, and transformer interoperability across global vendors.

FAQ

What is the input voltage range supported by the MAXREFDES114C#?

The MAXREFDES114C# operates over a 17V to 36V DC input range, with EN/UVLO set to 16.5V turn-on and OVI shutdown at 37.0V. This accommodates industrial 24V buses with wide tolerance and transient margins. The MAXREFDES114C# maintains regulation and protection functionality across this full range, as verified in lab measurements including line regulation tests.

Which transformer is used on the MAXREFDES114C# board?

The MAXREFDES114C# uses the Hanrun HR051441 transformer, selected specifically for this variant to meet isolation, leakage inductance, and flux-swing requirements of the active-clamp forward topology. Unlike MAXREFDES114A# (Wurth), MAXREFDES114B# (Sumida), or MAXREFDES114D# (Halo), the MAXREFDES114C# is uniquely configured with Hanrun's component for optimized cost and supply chain alignment.

Does the MAXREFDES114C# provide output short-circuit protection?

Yes, the MAXREFDES114C# implements hiccup-mode overcurrent protection via the MAX17599 controller. During sustained overload or short-circuit conditions, the MAXREFDES114C# cycles on/off with controlled restart intervals to limit power dissipation and prevent thermal damage while maintaining system safety.

What is the output voltage accuracy and ripple performance of the MAXREFDES114C#?

The MAXREFDES114C# delivers 5V ±0.25V under all load and line conditions, with measured output ripple below 50mVpp at 2A full load (24V input). This performance is enabled by synchronous rectification (N2/N3), multi-capacitor output filtering (C11/C19/C20/C23), and tight optocoupler-based feedback control.

Can the switching frequency of the MAXREFDES114C# be adjusted?

The MAXREFDES114C# operates at a nominal 330kHz, but supports frequency dithering via the MAX17599's FREQ pin to enable low-EMI spread-spectrum operation. External resistor programming allows tuning - no hardware modification is needed to activate this feature, making the MAXREFDES114C# suitable for EMI-sensitive industrial environments.