Renesas ISL6844EVAL2

Overview

ISL6844EVAL2 from Renesas Electronics is an evaluation board for the ISL6844 adjustable-frequency, low-power, current-mode PWM controller used in isolated flyback and boost power converters. It supports 14.4V UVLO start-up, 50% maximum duty cycle, 1A peak gate drive, 25ns CS-to-OUT propagation delay, and operation up to 2MHz switching frequency - enabling high-efficiency telecom and industrial DC/DC designs.

For engineers reviewing the ISL6844EVAL2 datasheet, ISL6844EVAL2 setup guide, ISL6844EVAL2 test configuration, or ISL6844EVAL2 compatible controllers, this page provides verified pinout mapping, functional context for flyback/boost validation, key performance boundaries under load, and direct alternatives for design continuity when transitioning from legacy 384x-based platforms.

Technical Context

The ISL6844EVAL2 implements a fixed-layout reference design centered on the ISL6844 IC, which features peak current mode control with 100mV CS offset, trimmed RTCT discharge current for precise deadtime control, and a high-bandwidth error amplifier optimized for fast transient response in isolated topologies. Its oscillator uses external RT/CT components to set frequency and maximum duty cycle.

It validates critical ISL6844 behaviors including 60µA start-up current, 20ns rise/fall times into 1nF load, tight 5.00V ±1.0%/–1.5% VREF tolerance over temperature, and fault protection triggered by VREF falling below 4.65V - all essential for stable operation in telecom and server power supplies.

Key Specifications

Availability

ISL6844EVAL2 is available at Aetrix Electronics and suitable for telecom power, industrial DC/DC conversion, and server PSU development requiring stable component supply and rapid prototyping capability.

Supply support for ISL6844EVAL2 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 manufacturer delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL6844EVAL2 belongs to Renesas' legacy analog power controller evaluation platform family, designed specifically to accelerate validation of current-mode PWM ICs in isolated and non-isolated switch-mode power supplies.

FAQ

What is the primary function of the ISL6844EVAL2 evaluation board?

The ISL6844EVAL2 evaluation board is a fully assembled, tested reference platform for the ISL6844 current-mode PWM controller. It enables engineers to validate flyback and boost converter designs, characterize loop stability, measure gate drive timing, and verify UVLO behavior, fault response, and thermal performance before committing to custom PCB layout. The board includes all necessary passive components, test points, and jumper-configurable operating modes.

Does the ISL6844EVAL2 support both flyback and boost topologies out of the box?

Yes, the ISL6844EVAL2 supports both topologies through documented schematic variants and layout provisions. Figure 1 in the ISL6844 datasheet shows its use in a 48V-input dual-output flyback configuration, while Figure 2 demonstrates a boost converter implementation. Component placement and test point access allow straightforward rework or external connection to either topology without redesigning the board.

What are the key electrical limits I must observe when using the ISL6844EVAL2?

When operating the ISL6844EVAL2, observe: VDD supply between 15V–18V (per ISL6844 recommended conditions), input voltage ≤20V absolute maximum, gate drive load ≤1nF for specified 20ns rise/fall times, and ambient temperature ≤+105°C. Exceeding the 14.4V UVLO start threshold or violating the 50% maximum duty cycle limit risks unstable operation or premature shutdown.

Can the ISL6844EVAL2 be used to evaluate other members of the ISL684x family?

No - the ISL6844EVAL2 is specifically configured for the ISL6844 (14.4V UVLO, 50% max duty cycle). While pin-compatible with ISL6840–ISL6843, differences in UVLO thresholds, duty cycle limits, and internal references mean substituting other ISL684x devices requires verification of biasing, compensation, and protection thresholds. Renesas does not guarantee full functional equivalence across the family on this board.

Is the ISL6844EVAL2 still in active production and supported by Renesas?

The ISL6844EVAL2 is listed as "no longer available or supported" in the official ISL6844 ordering information (FN9124 Rev.14.00, Page 5). Renesas recommends ISL8844AABZ as the replacement IC, but no direct successor evaluation board is documented. Aetrix Electronics maintains limited legacy stock with full documentation access and technical support for ongoing design reuse and obsolescence mitigation.