Analog Devices Inc./Maxim Integrated MAXREFDES116B#

Overview

MAXREFDES116B# from Maxim Integrated is an isolated 24V-to-5V, 40W (8A) industrial DC-DC reference design based on the MAX17599 active-clamp forward controller, implemented on a compact 20mm × 70mm PCB with through-hole pins for rapid prototyping in PLC and sensor power applications.

For engineers reviewing the MAXREFDES116B# datasheet, MAXREFDES116B# pinout, MAXREFDES116B# application, or MAXREFDES116B# equivalent, this page delivers verified topology details, efficiency data at 24V input, EMI-reduction features including programmable frequency dithering, and validated thermal and fault-protection behavior under industrial load transients.

Technical Context

The MAXREFDES116B# implements an active-clamp forward converter using the MAX17599 PWM controller, operating at 350kHz with programmable spread-spectrum dithering to reduce EMI. It supports 17V–36V input range and delivers regulated 5V ±0.25V output up to 8A.

Core protection functions include EN/UVLO (16.5V start), OVI (37.0V shutdown), hiccup-mode overcurrent, soft-start, soft-stop clamp-capacitor discharge, and thermal shutdown - all integrated into the MAX17599 control IC and validated across line/load/temperature.

Key Specifications

Availability

MAXREFDES116B# is available at Aetrix Electronics and suitable for programmable logic controllers (PLCs), industrial process sensors, and telecom/datacom auxiliary power supplies requiring stable component supply, fast evaluation turnaround, and production-ready reference implementation.

Supply support for MAXREFDES116B# 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 solutions for industrial, automotive, and communications markets.

The MAXREFDES reference design series targets rapid industrial power-system validation, delivering fully tested, documented, and purchasable hardware built around Maxim's robust controller ICs like the MAX17599.

FAQ

What is the input voltage range supported by the MAXREFDES116B#?

The MAXREFDES116B# supports 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 industrial 24V systems under brownout, transient overvoltage, and battery-backed operation - all verified per the reference design test report.

Does the MAXREFDES116B# provide reinforced or safety-rated isolation?

No, the MAXREFDES116B# provides functional insulation only, not reinforced or safety-rated isolation (e.g., UL/IEC 62368-1). It is intended for non-hazardous, low-risk industrial signal/power separation where galvanic break is required but regulatory safety certification is not mandated.

What is the peak efficiency of the MAXREFDES116B# and at what condition is it measured?

The MAXREFDES116B# achieves 91.5% peak efficiency at 24V input and full 8A load, as measured and documented in the official reference design lab report. Efficiency remains above 88% across 2A–8A loads under the same 24V input condition.

Can the switching frequency of the MAXREFDES116B# be adjusted?

Yes - while the MAXREFDES116B# operates at a nominal 350kHz, the MAX17599 controller supports programmable frequency dithering to enable low-EMI spread-spectrum operation. External resistor/capacitor programming allows tuning of dither depth and modulation rate per the MAX17599 datasheet.

What protection features are implemented on the MAXREFDES116B# board?

The MAXREFDES116B# implements input undervoltage lockout (16.5V), overvoltage shutdown (37.0V), hiccup-mode overcurrent, thermal shutdown, soft-start, and soft-stop clamp-capacitor discharge - all managed by the MAX17599 controller and validated across temperature and load steps per the reference design test summary.