STMicroelectronics EVAL6598-100W

Overview

EVAL6598-100W from STMicroelectronics is an evaluation board for the L6598 high-voltage resonant controller IC, designed to drive half-bridge MOSFETs in LLC and series-resonant AC/DC power supplies up to 100 W. It supports 600 V high-side operation, delivers 250 mA source / 450 mA sink gate drive, features integrated bootstrap diode and Zener clamping on Vs, and enables closed-loop control via its sense op amp - validated in wide-range AC/DC adapter reference designs.

For engineers reviewing the EVAL6598-100W datasheet, EVAL6598-100W pinout, EVAL6598-100W application, or EVAL6598-100W equivalent, this board provides rapid prototyping of resonant topologies with soft-start frequency shifting, dV/dt-immune high-voltage driving (±50 V/ns), and full thermal and UVLO protection - critical for evaluating startup behavior, deadtime tuning, and op-amp-based current-mode feedback in offline SMPS.

Technical Context

The EVAL6598-100W implements the L6598's full functional architecture: a dual-channel high/low-side driver with 80 ns rise / 40 ns fall times into 1 nF load, a current-controlled oscillator with programmable f_min (58–62 kHz) and f_start (114–126 kHz), and a rail-to-rail sense op amp (GBW = 0.5–1 MHz, V_io = ±10 mV) configurable for overcurrent protection or frequency modulation.

Its timing section integrates soft-start via CSS capacitor ramping, deadtime control (0.2–0.35 µs), and dual enable inputs (EN1 latched shutdown at 0.6 V, EN2 soft-restart at 1.2 V), while the bootstrap circuit replaces external diodes using a patented synchronous DMOS + series diode structure with 150 Ω typical R_DS(on).

Key Specifications

Availability

EVAL6598-100W is available at Aetrix Electronics and suitable for AC/DC adapter development, resonant converter qualification, and industrial auxiliary supply design requiring stable component supply and fast-turn evaluation support.

Supply support for EVAL6598-100W 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The EVAL6598-100W belongs to ST's Power Management Evaluation Kit portfolio, developed specifically to accelerate design-in of high-voltage resonant controllers in energy-efficient offline power supplies targeting efficiency compliance (e.g., DoE Level VI, CoC Tier 2).

FAQ

What topology does EVAL6598-100W implement?

EVAL6598-100W implements a half-bridge LLC resonant converter topology using the L6598 controller, with discrete GaN or Si MOSFETs, resonant tank (Lr, Cr), and transformer. It is not a flyback or PSR design - the board uses zero-voltage switching (ZVS) operation across line and load, verified per Figure 24 of the L6598 datasheet.

Can EVAL6598-100W be used with 230 VAC input?

Yes - the board is rated for universal AC input (85–265 VAC) and has been validated at 230 VAC nominal with 100 W output. Input rectification uses a bridge rectifier and bulk capacitor; the L6598's 600 V high-side rating and ±50 V/ns dV/dt immunity ensure robust operation under high-line transients and EMI stress.

Does EVAL6598-100W include the L6598 in DIP16 or SO16 package?

EVAL6598-100W uses the L6598D variant in SO16N package (order code L6598D), as confirmed by ST's official ordering table and board silkscreen markings. The SO16N footprint matches Table 7 mechanical data, and thermal performance is optimized for surface-mount assembly with heatsink interface.

How is overcurrent protection implemented on this board?

Overcurrent protection uses the L6598's integrated sense op amp: its non-inverting input connects to a current-sense resistor in the low-side MOSFET source path; the op amp output feeds the R_fmin pin to reduce switching frequency during overload - a true closed-loop foldback scheme, not just comparator-based shutdown.