Renesas ISL81806EVAL1Z

Overview

ISL81806EVAL1Z from Renesas Electronics is a dual-phase evaluation board built around the ISL81806 80V high-voltage synchronous buck controller, optimized for E-mode GaN FETs. It delivers 12V/20A output with 500kHz switching frequency, programmable soft-start, independent enable functions, and full protection suite (UV/OV/OC/OT). It is used to validate high-efficiency, high-current DC/DC conversion in industrial power supplies and telecom rectifiers.

For engineers reviewing the ISL81806EVAL1Z datasheet, ISL81806EVAL1Z application, ISL81806EVAL1Z test setup, or ISL81806EVAL1Z design example, this board provides complete functional validation of the ISL81806 controller under real-world conditions-including pre-bias startup, pulse-by-pulse OCP at 20.5A per phase, hiccup recovery, and DEM/PWM mode selection-enabling rapid prototyping of GaN-based 18–80V input systems.

Technical Context

The ISL81806EVAL1Z implements a two-phase interleaved synchronous buck topology using EPC2218 GaN FETs and TDK SPM10065VT-3R3M-D inductors. Its control loop leverages the ISL81806's integrated error amplifier, current-mode PWM modulation, and dual-phase timing synchronization via internal clock divider.

Protection is implemented through dedicated analog comparators: EN/UVLO pin monitors input voltage with 16.49V rising threshold (set by R10/R11), CS pins sense peak current per phase (82mV threshold), and IMON1/IMON2 pins monitor average output current (25A set point via R15). PGOOD indicator confirms regulated 12V output within ±3% tolerance.

Key Specifications

Availability

ISL81806EVAL1Z is available at Aetrix Electronics and suitable for industrial power supply development, telecom rectifier validation, GaN FET reference design qualification, and high-density DC/DC converter prototyping requiring stable component supply and documented performance benchmarks.

Supply support for ISL81806EVAL1Z 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL81806EVAL1Z belongs to Renesas' high-voltage DC/DC evaluation platform family, designed specifically to accelerate adoption of GaN-based power conversion by providing fully characterized, production-ready reference designs with comprehensive thermal, electrical, and layout validation.

FAQ

What is the primary function of the ISL81806EVAL1Z?

The ISL81806EVAL1Z is a dual-phase evaluation board that demonstrates and validates the ISL81806 80V synchronous buck controller operating with E-mode GaN FETs. It enables engineers to verify key performance metrics-including efficiency, transient response, OCP behavior, and soft-start sequencing-under real 18–80V input conditions delivering 12V/20A. The ISL81806EVAL1Z is not a production power module but a design and test vehicle for GaN-based power stage development.

Does the ISL81806EVAL1Z support both forced PWM and diode emulation modes?

Yes, the ISL81806EVAL1Z supports both forced PWM and diode emulation (DEM) operation. Mode selection is controlled by resistor RPWMMODE (R5): a 20kΩ pull-down sets forced PWM, while a 39kΩ pull-down enables DEM. This flexibility allows users to evaluate light-load efficiency trade-offs and validate GaN-specific gate drive behavior-including pre-bias startup compatibility-using the same ISL81806EVAL1Z hardware.

What protection features are implemented on the ISL81806EVAL1Z?

The ISL81806EVAL1Z implements UVLO (16.49V rising threshold), overvoltage (OVP), overtemperature (OTP), overcurrent (OCP), and PGOOD monitoring. OCP includes three layers: pulse-by-pulse limiting at 20.5A per phase, hiccup recovery at 24.5A per phase, and average current regulation at 25A total. These protections are fully active and verified per the ISL81806EVAL1Z User Manual Rev.1.1, ensuring safe operation during lab testing and stress validation.

Can the ISL81806EVAL1Z be used to evaluate pre-biased output startup?

Yes, the ISL81806EVAL1Z supports pre-biased output startup with soft-start enabled. The ISL81806 controller integrates dedicated circuitry to manage VOUT pre-bias conditions without damaging GaN FETs, and this capability is validated on the ISL81806EVAL1Z using its configured soft-start capacitor (C59 = 27nF, yielding 5.4ms ramp time). The board's schematic and layout ensure proper gate bias sequencing during pre-bias scenarios.

What are the critical external components defining the ISL81806EVAL1Z's electrical ratings?

The ISL81806EVAL1Z's electrical ratings-especially output current and thermal performance-are defined by its selected external components: EPC2218 GaN FETs (100V, 60A, 3.2mΩ rDS(on)), TDK SPM10065VT-3R3M-D inductors (3.3µH, 14.5A rating), and Panasonic 16SVPK12000M polymer output capacitor (1200µF, 16V). Per the user manual, "the ISL81806EVAL1Z electrical ratings are limited by the FETs and inductor selected," confirming these parts directly determine the board's 20A continuous capability.