Analog Devices Inc./Maxim Integrated MAX17686EVKITA#

Overview

MAX17686EVKITA# from Maxim Integrated is an evaluation kit for the MAX17686 high-voltage iso-buck DC-DC converter, enabling rapid prototyping of isolated 5W power supplies with primary-side regulation, 4.5V–60V input range, and no optocoupler requirement. It supports design validation for industrial fieldbus interfaces, PLC I/O modules, and smart metering systems.

For engineers reviewing the MAX17686EVKITA# datasheet, MAX17686EVKITA# pinout, MAX17686EVKITA# application, or MAX17686EVKITA# equivalent, this kit provides verified reference layout, transformer selection guidance, hiccup-mode overcurrent protection behavior, soft-start timing calibration, and RESET signal timing validation under load transients and fault conditions.

Technical Context

The MAX17686EVKITA# implements the MAX17686 IC in a fully assembled, tested configuration with a 1:2.4 turns-ratio transformer (T1), ceramic input/output capacitors, and discrete compensation network. It operates in peak-current-mode control with 200kHz nominal switching frequency and supports adjustable EN/UVLO threshold (1.218V typ) and soft-start time via external CSS capacitor.

This kit validates dual-level overcurrent protection: cycle-by-cycle peak current limit (1.65A typ), sink current limit (1.25A typ), and runaway current limit (1.7A typ), plus secondary-side hiccup recovery triggered by 16 consecutive negative current events or primary output voltage drop to 71.14% of regulation. Thermal shutdown activates at 165°C with 10°C hysteresis.

Key Specifications

Availability

MAX17686EVKITA# is available at Aetrix Electronics and suitable for industrial fieldbus interface development, PLC I/O module power design, and smart meter isolated supply validation requiring stable component supply, full documentation access, and production-ready reference schematics.

Supply support for MAX17686EVKITA# 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 MAX17686EVKITA# belongs to the Rainier series of isolated DC-DC products, engineered specifically to replace optocoupler-based feedback architectures with compact, high-efficiency iso-buck solutions for space-constrained industrial power systems.

FAQ

What is the purpose of the MAX17686EVKITA# evaluation kit?

The MAX17686EVKITA# is a fully assembled evaluation platform for the MAX17686 iso-buck DC-DC controller. It demonstrates primary-side regulated isolated power delivery up to 5W without an optocoupler, validates hiccup-mode overcurrent protection, and provides measured waveforms for soft-start, load transient response, and RESET timing. Engineers use MAX17686EVKITA# to verify transformer selection, compensation network tuning, and system-level fault behavior before custom PCB design.

Does the MAX17686EVKITA# support adjustable input undervoltage lockout (UVLO)?

Yes, the MAX17686EVKITA# implements the MAX17686's programmable EN/UVLO function via an external resistor divider (R1 = 110kΩ, R2 = 10.5kΩ on board). This sets the turn-on threshold near 1.218V at the EN/UVLO pin, corresponding to ~17V input activation. The MAX17686EVKITA# schematic and layout confirm direct routing of this network, enabling users to modify resistor values to shift UVLO thresholds for specific host system requirements.

Can the MAX17686EVKITA# be used to evaluate secondary-side overcurrent protection?

Yes - the MAX17686EVKITA# demonstrates robust secondary-side overcurrent protection through hiccup-mode recovery. When the secondary output is shorted, the primary output discharges during the hiccup timeout (32,768 clock cycles), and the MAX17686EVKITA# exhibits smooth soft-start recovery upon fault removal. This behavior is documented in the MAX17686 datasheet and verified on the MAX17686EVKITA# board using oscilloscope capture of VPRI, RESET, and LX waveforms under fault conditions.

What transformer is used on the MAX17686EVKITA# board?

The MAX17686EVKITA# uses a custom-wound transformer with a 1:2.4 turns ratio (NPRI:NSEC), optimized for 24V secondary output from a 17–60V input. Its parameters - including primary inductance (~12µH), leakage inductance (<1% of LPRI), and isolation rating - are specified in the MAX17686EVKITA# user guide. The board layout includes precise land patterns matching the transformer's footprint and creepage/clearance requirements for reinforced isolation.

How does the MAX17686EVKITA# handle thermal protection?

The MAX17686EVKITA# incorporates the MAX17686's built-in thermal shutdown circuitry, triggering at +165°C junction temperature with 10°C hysteresis. During testing, the board maintains safe operation below this threshold under full 5W load at +70°C ambient, thanks to the exposed-pad TDFN package mounted to a 4-layer PCB with thermal vias. The MAX17686EVKITA# user guide includes thermal imaging data and θJA = 67.3°C/W characterization per JEDEC JESD51-7.