Renesas ISL6551EVAL1

Overview

ISL6551EVAL1 from Intersil is a 28-pin SOIC evaluation board for the ISL6551 ZVS full-bridge PWM controller, supporting fixed-frequency current-mode control up to 1 MHz, programmable resonant delay (50–500 ns), and synchronous rectification drive signals (SYNC1/SYNC2). It enables rapid prototyping of telecom/datacom power supplies requiring zero-voltage switching, high efficiency, and multi-unit current sharing.

For engineers reviewing the ISL6551EVAL1 datasheet, ISL6551EVAL1 pinout, ISL6551EVAL1 application, or ISL6551EVAL1 equivalent, this board provides validated reference design integration with ISL6550 supervisor and HIP2100 half-bridge drivers, supports 200W telecom supply implementation per AN1002, and delivers traceable thermal management and hiccup-mode short-circuit protection verification.

Technical Context

The ISL6551EVAL1 implements a complete full-bridge control system using the ISL6551 IC in 28 Ld SOIC package, integrating dual high-current totem-pole drivers (UPPER1/UPPER2 at 50% duty cycle; LOWER1/LOWER2 trailing-edge PWM), 10 MHz error amplifier, and precision ±1.5% bandgap reference. It supports resonant delay tuning via R_RESDLY (50–500 ns) and dead time adjustment via RD (50–1000 ns) for shoot-through prevention.

Designed for isolated DC/DC conversion, the board accommodates external transformers, Schottky/synchronous rectifiers, and companion ICs including ISL6550 supervisor and HIP2100 drivers. It validates push-pull operation (excluding upper-driver and resonant-delay features) and enables current share across up to 10 units via SHARE bus and CS_COMP loop bandwidth (500 Hz).

Key Specifications

Availability

ISL6551EVAL1 is available at Aetrix Electronics and suitable for telecom power supply development, datacom converter validation, and high-end server PSU design requiring stable component supply and reference design fidelity.

Supply support for ISL6551EVAL1 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in power management, precision analog, and interface ICs for industrial, telecom, and computing applications.

The ISL6551EVAL1 belongs to Intersil's high-efficiency isolated power controller evaluation platform family, designed to accelerate development of ZVS full-bridge and push-pull converters for telecom/datacom infrastructure and high-reliability server power systems.

FAQ

What is the primary function of the ISL6551EVAL1 evaluation board?

The ISL6551EVAL1 evaluation board is a fully assembled platform for validating the ISL6551 ZVS full-bridge PWM controller in real-world telecom/datacom power supplies. It implements all key ISL6551 features-including programmable resonant delay, synchronous rectification drive signals (SYNC1/SYNC2), current sharing via SHARE bus, and hiccup-mode overcurrent protection-enabling rapid testing of 200W-class isolated DC/DC designs per application note AN1002.

Does the ISL6551EVAL1 support push-pull converter topologies?

Yes, the ISL6551EVAL1 supports push-pull converter implementation using the ISL6551 IC, though two features-upper driver outputs (UPPER1/UPPER2) and adjustable resonant delay-are excluded per datasheet specification. The board retains full current-mode control, soft-start, leading edge blanking, slope compensation, and protection functions essential for push-pull operation.

What companion ICs are integrated or recommended for use with the ISL6551EVAL1?

The ISL6551EVAL1 is designed to work with the ISL6550 supervisor and monitor IC and HIP2100 half-bridge drivers as documented in AN1002. While the evaluation board itself hosts only the ISL6551, its schematic and layout accommodate these companion devices for complete 200W telecom supply validation, including input monitoring, output regulation, and high-current gate driving.

How does the ISL6551EVAL1 implement current sharing across multiple units?

The ISL6551EVAL1 enables current sharing across up to 10 ISL6551-based units via the SHARE pin and CS_COMP loop. The board provides the necessary termination and filtering components to achieve ≤30 mV voltage offset between master/slave error amplifiers and supports a 500 Hz current share loop bandwidth when CS_COMP is configured with a 0.1 µF capacitor, ensuring balanced load distribution without external op-amps.

What thermal and layout considerations are specified for the ISL6551EVAL1?

The ISL6551EVAL1 follows Intersil's thermal guidelines: heavy copper traces are used for PGND and VDDP1/VDDP2 connections to manage heat from high-current drivers, and VSS is connected to PGND at a single point near the IC to minimize noise coupling. The board implements recommended decoupling-0.1 µF ceramic capacitors directly at VDD–VSS and VDDP1/VDDP2–PGND-and supports operation within the ISL6551's 0°C to +85°C ambient range (ISL6551IB variant).