STMicroelectronics EVLSRK1004D

Overview

EVLSRK1004D from STMicroelectronics is an evaluation board for the SRK1004D secondary-side synchronous rectification controller, designed specifically for Non-Complementary Active Clamp Flyback (NC-ACF) converters. It integrates the STL120N10F8 100 V / 125 A N-channel MOSFET in PowerFLAT 5×6 package, supports up to 500 kHz switching, operates from 4–36 V supply, and features DVS sensing with 190 V AMR capability.

For engineers reviewing the EVLSRK1004D datasheet, EVLSRK1004D pinout, EVLSRK1004D application, or EVLSRK1004D equivalent, this board enables rapid validation of SRK1004D-controlled high-efficiency low-side or high-side synchronous rectification in AC/DC adapters, USB PD chargers, and industrial flyback power supplies with precise short-circuit detection and gate-drive timing control.

Technical Context

The EVLSRK1004D implements a zero-current-switching (ZCS)-based control scheme: it turns on the SR MOSFET as soon as reverse body diode conduction begins and turns it off near current zero-crossing. This minimizes conduction loss while avoiding shoot-through in NC-ACF topologies.

It supports dual configuration modes-low-side (direct output-voltage supply) and high-side (auxiliary winding supply)-with configurable short-circuit detection via R5 ≥ 47 kΩ to set V_out,sc (e.g., 150 ns turn-off delay, 9 V V_CC typical).

Key Specifications

Availability

EVLSRK1004D is available at Aetrix Electronics and suitable for USB PD fast chargers, industrial AC/DC adapters, and telecom offline power supplies requiring stable component supply, quick-turn evaluation, and validated reference design integration.

Supply support for EVLSRK1004D 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, specializing in power management, analog, microcontrollers, and automotive-grade ICs.

The SRK1004x series targets high-efficiency secondary-side synchronous rectification in next-generation flyback converters, especially NC-ACF and QR topologies where precise timing and robust fault handling are essential.

FAQ

What topology is EVLSRK1004D optimized for?

EVLSRK1004D is specifically optimized for Non-Complementary Active Clamp Flyback (NC-ACF) converters. Its control logic, DVS sensing range (190 V AMR), and 150 ns turn-off delay are tuned to match the voltage and timing behavior of NC-ACF secondary waveforms, enabling efficient ZCS-based SR operation without external timing components.

Can EVLSRK1004D be used in high-side SR configuration?

Yes - EVLSRK1004D supports high-side configuration using an auxiliary winding for V_CC. In this mode, R5 > 47 kΩ must be installed to enable short-circuit detection, and V_out,sc is set by R5 (e.g., 150 kΩ yields 2 V). The board's schematic includes dedicated jumpers and layout provisions for both low-side and high-side implementation.

Which MOSFET is integrated on EVLSRK1004D?

EVLSRK1004D integrates the STL120N10F8 - a 100 V, 125 A N-channel MOSFET in PowerFLAT 5×6 package with R_DS(on) = 4.6 mΩ @ 10 V. This device is selected to pair with the SRK1004D's 9 V V_CC rating and high-frequency gate drive capability for minimal conduction loss in high-current adapter applications.

How does EVLSRK1004D handle short-circuit protection?

EVLSRK1004D implements fast short-circuit detection via its SRK1004D controller's SCP pin (Pin 3), which monitors output voltage through resistor divider R5. When configured with R5 > 47 kΩ, the board detects V_out collapse and disables gate drive within nanoseconds - critical for protecting the SR MOSFET and primary-side switch during overload or short-circuit events.