Renesas ISL8115EVAL1Z

Overview

ISL8115EVAL1Z from Renesas Electronics is an evaluation board for the ISL8115 synchronous buck PWM controller, configured as a 1.5V/30A step-down converter operating from 10V–15V input. It implements voltage-mode control with input feed-forward, features integrated 4A gate drivers, and supports 220kHz fixed switching frequency with diode emulation mode for light-load efficiency.

For engineers reviewing the ISL8115EVAL1Z datasheet, ISL8115EVAL1Z pinout, ISL8115EVAL1Z application, or ISL8115EVAL1Z equivalent, this board enables rapid validation of high-current POL designs, transient response under wide VIN, OCP/OVP protection behavior, and synchronization capability with external clock signals up to 1.5MHz.

Technical Context

The ISL8115EVAL1Z implements the ISL8115 controller in a fully assembled, tested reference design using dual RJK0305 upper/lower MOSFETs and a 320nH power inductor. It delivers precise 1.5V ±0.7% output regulation across –40°C to +105°C via differential sensing and a 0.6V internal reference.

Control architecture includes leading-edge PWM modulation, programmable soft-start, pre-bias start-up, and fast transient response enabled by input voltage feed-forward. Protection features include overcurrent (32A typ), input UVP (9.2V/9.7V thresholds), output OVP/UVP, OTP, and open-drain PGOOD signaling.

Key Specifications

Availability

ISL8115EVAL1Z is available at Aetrix Electronics and suitable for datacom power supply validation, telecom POL testing, and high-current FPGA/ASIC core rail prototyping requiring stable component supply and documented reference performance.

Supply support for ISL8115EVAL1Z 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 ISL8115EVAL1Z belongs to Renesas' high-performance power management evaluation platform family, designed to accelerate adoption of wide-input synchronous buck controllers in demanding datacenter and communications power systems.

FAQ

What is the primary function of the ISL8115EVAL1Z?

The ISL8115EVAL1Z is a fully assembled evaluation board for the ISL8115 synchronous buck PWM controller. It provides a validated 1.5V/30A power stage optimized for 10V–15V input, enabling engineers to characterize transient response, efficiency, protection behavior, and synchronization functionality without designing from scratch. The ISL8115EVAL1Z integrates all critical components including MOSFETs, inductor, and feedback network.

Can the output voltage of the ISL8115EVAL1Z be adjusted?

Yes, the ISL8115EVAL1Z output voltage is adjustable via resistor divider R1/R4 per Equation 1 in AN1881. The default configuration sets 1.5V, but changing R4 while maintaining the R11/R8 ratio preserves compensation stability. Adjustment requires soldering and recalibration of VMON-based OVP/UVP thresholds to match the new VOUT setting. The ISL8115EVAL1Z schematic and BOM document all required component locations.

Does the ISL8115EVAL1Z support external clock synchronization?

Yes, the ISL8115EVAL1Z supports synchronization to an external clock signal applied to the FSET pin. A 150kHz–1.5MHz square wave (10%–90% duty cycle) locks the internal oscillator. To enable sync, R27 must be removed per AN1881 Section "Synchronization". This feature allows timing alignment with system clocks or noise-sensitive frequency bands. The ISL8115EVAL1Z includes dedicated CLK_IN and CLK_OUT test points for verification.

What protection features are implemented on the ISL8115EVAL1Z?

The ISL8115EVAL1Z implements comprehensive protection: input UVP (9.2V/9.7V hysteresis), output OVP/UVP (via VMON pin), cycle-by-cycle overcurrent limiting (32A typical), thermal shutdown, and open-drain PGOOD signaling. These functions are directly enabled by the ISL8115 controller and verified in AN1881 Figures 17–18. The ISL8115EVAL1Z also supports diode emulation mode to improve light-load efficiency without compromising protection integrity.

What test equipment is recommended for evaluating the ISL8115EVAL1Z?

AN1881 specifies a 60W input supply (≤15V), 50W electronic load, 100MHz quad-trace oscilloscope, and calibrated voltmeters/ammeters. Critical measurements include output ripple (TP8/TP9), phase-node ringing (TP3), PGOOD timing (TP4), and load-step transients (using current slew rate ≥2A/µs). Probe setup follows Figure 3 to avoid ground loop errors. The ISL8115EVAL1Z includes labeled test points (TP1–TP9) matching these measurement requirements.