Renesas ISL81805EVAL2Z

Overview

ISL81805EVAL2Z from Renesas Electronics is a dual-output evaluation board designed to validate the ISL81805 80V dual synchronous boost controller IC in high-voltage DC/DC applications. It delivers regulated 48V@3A and 24V@5A outputs, supports programmable 200kHz switching frequency, and integrates UV/OV/OC/OT protection with independent enable and soft-start functions.

For engineers reviewing the ISL81805EVAL2Z datasheet, ISL81805EVAL2Z pinout, ISL81805EVAL2Z application, or ISL81805EVAL2Z equivalent, this board enables rapid functional validation of dual-channel high-voltage boost topologies, PWM/DEM mode selection, input/output average OCP configuration, and thermal performance under continuous load without forced airflow.

Technical Context

The ISL81805EVAL2Z implements two independent synchronous boost channels using external N-channel MOSFETs (Infineon BSC070N10NS5ATMA1) and power inductors (Wurth 74439370100 and 74439370068). Each channel features dedicated feedback dividers, current-sense resistors (0.004Ω), and configurable protection modes including constant-current or hiccup OCP.

It supports flexible operation via on-board jumpers: J6 selects Forced PWM or DEM mode; J7 selects constant-current limit or hiccup OCP; J3 and J19 independently disable Channel 1 (48V) or Channel 2 (24V). The board operates across –40°C to +85°C with input ranges of 9–36V (for 48V output) and 9–20V (for 24V output).

Key Specifications

Availability

ISL81805EVAL2Z is available at Aetrix Electronics and suitable for high-voltage DC/DC converter development, power supply qualification, and dual-output boost topology validation requiring stable component supply and full functional verification support.

Supply support for ISL81805EVAL2Z 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, and infrastructure markets.

The ISL81805EVAL2Z belongs to Renesas' high-voltage power management evaluation platform family, engineered to accelerate adoption of the ISL81805 dual boost controller in telecom power systems, industrial HVDC supplies, and battery-powered high-voltage applications.

FAQ

What is the primary function of the ISL81805EVAL2Z evaluation board?

The ISL81805EVAL2Z evaluation board is a fully assembled, tested platform for validating the ISL81805 dual synchronous boost controller IC. It provides immediate access to both 48V@3A and 24V@5A regulated outputs, enabling engineers to verify loop stability, protection behavior, efficiency, and thermal performance without custom PCB design. The ISL81805EVAL2Z serves as Renesas' reference test vehicle used internally by application engineers and IC designers.

Can the ISL81805EVAL2Z operate both output channels simultaneously at full load?

Yes, the ISL81805EVAL2Z is rated for simultaneous 3A on the 48V channel and 5A on the 24V channel at ambient room temperature without forced airflow. This capability is enabled by optimized thermal layout, low-DCR inductors (6.5mΩ and 4.1mΩ), and high-current MOSFETs (80A rating). The ISL81805EVAL2Z electrical ratings confirm continuous operation under these conditions per its Rev.1.00 Evaluation Board Manual.

How is switching frequency configured on the ISL81805EVAL2Z?

The ISL81805EVAL2Z uses resistor R19 (169kΩ) to set the default switching frequency to 200kHz, calculated per Equation 1 in the manual. This value falls within the ISL81805's programmable 100kHz–1MHz range. Engineers can replace R19 to adjust frequency - lower resistance increases frequency - directly impacting inductor size, efficiency trade-offs, and EMI profile during evaluation.

Does the ISL81805EVAL2Z support pre-bias start-up?

Yes, the ISL81805EVAL2Z supports pre-bias output start-up with soft-start enabled. This functionality is inherited from the ISL81805 controller IC and verified in the board's functional description. When an output voltage is already present before enable, the ISL81805EVAL2Z initiates controlled ramp-up without disrupting downstream circuitry - critical for hot-swap and redundant power systems.

What protection features are implemented on the ISL81805EVAL2Z?

The ISL81805EVAL2Z implements UVLO, OVP, OTP, and UVP protection per the ISL81805 controller's integrated safety architecture. It also supports optional input-average overcurrent protection (OCP) with selectable constant-current or hiccup mode via jumper J7. These protections are hardware-configured and validated across operating temperature (–40°C to +85°C) and load conditions, as documented in Section 1.2 of the ISL81805EVAL2Z Evaluation Board Manual.