Renesas ISL854102DEMO2Z

Overview

ISL854102DEMO2Z from Intersil is a demonstration board built around the ISL854102 1.2A synchronous buck regulator, configured in an isolated buck topology to deliver +12V primary and dual ±12V secondary outputs. It supports input voltages from 19V to 40V, operates at 500kHz (adjustable 300kHz–2MHz), and delivers up to 0.8A on the primary output and ±150mA on each secondary rail - enabling validation of multi-rail isolated power architectures for industrial analog systems.

For engineers reviewing the ISL854102DEMO2Z datasheet, ISL854102DEMO2Z pinout, ISL854102DEMO2Z application, or ISL854102DEMO2Z equivalent, this board provides hands-on evaluation of wide-VIN isolated buck conversion with synchronized dual-polarity secondary outputs, soft-start control, frequency programming, and enable/sync functionality under real load conditions.

Technical Context

The ISL854102DEMO2Z implements an isolated buck converter using the ISL854102 IC, which integrates high-side and low-side NMOS FETs and supports both internal fixed-frequency (500kHz) and resistor-programmable switching (300kHz–2MHz via FS pin). The board uses a custom transformer (HPH4_0140L, 23.7µH) to generate galvanically isolated ±12V secondary outputs from the primary 12V rail.

It features configurable operation modes: PWM (default, via R9=200k to VCC) or PFM (via SYNC tied to GND), though PFM is explicitly discouraged here due to degraded regulation on secondary outputs. Soft-start is selectable between internal (R11 = 0Ω) and external (R11 open), and isolation between primary and secondary grounds can be enabled by replacing R12 (0Ω) with a 2200pF capacitor.

Key Specifications

Availability

ISL854102DEMO2Z is available at Aetrix Electronics and suitable for industrial analog instrumentation, isolated sensor interface design, and dual-rail op-amp power supply validation requiring stable component supply and rapid prototyping support.

Supply support for ISL854102DEMO2Z 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 Corporation (now part of Renesas Electronics) designs high-performance analog and power management ICs for industrial, communications, and computing applications.

The ISL854102DEMO2Z belongs to Intersil's demonstration platform series for wide-input synchronous buck regulators, intended to accelerate development of isolated multi-output DC/DC converters in noise-sensitive analog systems.

FAQ

What is the purpose of the ISL854102DEMO2Z demonstration board?

The ISL854102DEMO2Z demonstration board is designed to evaluate the ISL854102 synchronous buck regulator in an isolated buck configuration delivering +12V primary and ±12V secondary outputs. It enables engineers to validate performance metrics including load regulation, line regulation, startup/shutdown behavior, and frequency programmability under real-world conditions without designing a custom PCB. The board includes all necessary passives, transformer, and test points for immediate bench testing.

Can the ISL854102DEMO2Z generate non-isolated outputs?

No - the ISL854102DEMO2Z is specifically configured as an isolated buck converter using the HPH4_0140L transformer to produce galvanically separated ±12V secondary outputs. Its layout, grounding scheme (with R12 bridging or isolating PGND/ISOGND), and schematic are optimized for isolation. To implement non-isolated outputs, a different reference design or custom layout would be required, as the ISL854102DEMO2Z does not support direct non-isolated secondary generation.

How is switching frequency adjusted on the ISL854102DEMO2Z?

Switching frequency on the ISL854102DEMO2Z is adjusted via the FS pin: default 500kHz when R13 (0Ω) ties FS to VCC; removing R13 and populating R14 sets frequency from 300kHz (R14 = 340kΩ) to 2MHz (R14 = 32.4kΩ). The board's UG138 manual provides resistor calculation guidance. Leaving FS floating is prohibited - it must be actively pulled to VCC or grounded through a defined resistor network per ISL854102 specifications.

Does the ISL854102DEMO2Z support PFM mode, and is it recommended?

The ISL854102DEMO2Z can operate in PFM mode by tying the SYNC pin to GND, but this mode is explicitly not recommended per the UG138 manual. PFM degrades regulation accuracy and cross-regulation on the ±12V secondary outputs, compromising performance in applications requiring stable dual-rail analog biasing. The board is optimized for PWM operation (SYNC pulled to VCC via R9 = 200kΩ), ensuring consistent timing and predictable ripple behavior across all outputs.

What test equipment is required to evaluate the ISL854102DEMO2Z?

Evaluating the ISL854102DEMO2Z requires a 0–50V/2A+ DC power supply, electronic loads capable of sinking ≥2A, a 100MHz quad-trace oscilloscope, digital multimeters, and optionally a signal generator for SYNC injection. These tools enable measurement of startup waveforms (EN, VOUT_PR, VOUT_SC±), load/line regulation, switching node dynamics, and cross-regulation behavior - all critical for validating isolated multi-output power integrity in industrial analog designs.