STMicroelectronics EVL6699-90WADP

Overview

EVL6699-90WADP from STMicroelectronics is an evaluation board for the L6699 double-ended resonant half-bridge controller IC, designed to demonstrate 90 W LLC topology operation with symmetrical 180° complementary gate drive, adaptive deadtime control, and burst-mode light-load efficiency. It supports AC-DC adapter and open-frame SMPS applications with 600 V high-side gate driver, 58–245 kHz programmable oscillator, and integrated bootstrap diode.

For engineers reviewing the EVL6699-90WADP datasheet, EVL6699-90WADP pinout, EVL6699-90WADP application, or EVL6699-90WADP equivalent, this board enables rapid validation of LLC resonant converter startup behavior, capacitive-mode protection, PFC interface coordination, and soft-start frequency-shift performance under real-world line and load transients.

Technical Context

The EVL6699-90WADP implements a complete 90 W LLC resonant half-bridge power supply using the L6699 controller, which regulates output voltage by modulating switching frequency between 58 kHz (min) and 245 kHz (max) while maintaining fixed 50% duty cycle per switch. Its adaptive deadtime circuit dynamically adjusts timing between high-side and low-side MOSFET transitions based on midpoint voltage slew rate to ensure ZVS across input and load ranges.

Startup employs a dual-stage safe-start procedure: initial frequency-shift soft-start (from preset max to steady-state) combined with unbalanced V·s compensation to prevent hard-switching during transformer magnetization. At light load, burst-mode activation via STBY pin reduces quiescent current to 400–500 µA while retaining latched OCP and capacitive-mode detection.

Key Specifications

Availability

EVL6699-90WADP is available at Aetrix Electronics and suitable for AC-DC adapter development, open-frame SMPS prototyping, and LCD TV auxiliary power supply design requiring stable component supply and validated reference layout.

Supply support for EVL6699-90WADP 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

The EVL6699-90WADP belongs to ST's high-voltage resonant controller evaluation platform family, engineered specifically to accelerate adoption of energy-efficient LLC topologies in mid-power SMPS designs targeting Energy Star and EU CoC Tier 2 compliance.

FAQ

What input voltage range does the EVL6699-90WADP support?

The EVL6699-90WADP evaluation board operates from universal AC input (85–265 VAC) with active PFC pre-regulation, enabling full 90 W output across the range. Its LINE pin interface supports brownout detection down to 1.25 V threshold, and internal UVLO ensures reliable startup above 10.7 V VCC.

How is capacitive-mode operation prevented on this board?

The EVL6699-90WADP leverages the L6699's built-in capacitive-mode detection circuit, which monitors zero-current crossing polarity at the half-bridge midpoint. When capacitive behavior is sensed, the controller forces immediate frequency increase and discharges the CSS soft-start capacitor to avoid hard-switching and maintain ZVS integrity.

Can the EVL6699-90WADP interface with external PFC controllers?

Yes - the board implements the L6699's PFC_STOP open-drain output (Pin 9), which actively pulls low during fault conditions (OCP, DIS latch, capacitive mode) or burst-mode entry. This signal synchronously disables compatible PFC ICs like the L4981 or L6562 to reduce no-load consumption and meet energy-saving regulations.

What thermal performance can be expected from the EVL6699-90WADP at full load?

At 90 W continuous output, the EVL6699-90WADP maintains junction temperature below 105 °C on the L6699 SO16N package (R_{th j-amb} = 120 °C/W) with standard 2-layer PCB and minimal heatsinking. The board uses optimized copper pour and thermal vias under the controller and MOSFETs to sustain 0.83 W dissipation at 50 °C ambient.