STMicroelectronics (NYSE:STM)
GENEVA, SWITZERLAND, January 15, 2026 /EINPresswire.com/ — STMicroelectronics’ SRK1004 synchronous-rectifier controllers save space and increase efficiency in the secondary side of active-clamp, resonant, and quasi-resonant flyback (ACF, AHB, QR) converters for chargers, power adapters, and switched-mode power supplies. The minuscule 2mm x 2mm ICs supersede the SRK1001 and implement a new switch-off algorithm for increased efficiency and robustness.
With six variants available, the SRK1004 series lets designers choose logic-level or standard MOSFET gate drive, and 25ns or 150ns turn-off delay to compensate for drain inductance. Suitable for active clamp, resonant and quasi-resonant flyback topologies, the controllers also contain circuitry that creates a turn-on window to prevent unwanted switching. The output can sink up to 1.6A and source 0.6A to the gate, while the switching frequency of 500kHz permits a compact and low-cost design.
Leveraging ST’s robust silicon-on-insulator (SOI) process, the SRK1004 can control the MOSFET in either low-side or high-side connection with up to 190V drain-source voltage. With a wide supply-voltage range, from 4V to 36V, the IC can be powered from the converter’s output in a low-side configuration or from the transformer in a high-side configuration. This lets designers avoid providing a dedicated auxiliary power supply and so minimize the bill of materials. The SRK1004 contains a linear regulator that supplies the IC’s internal circuitry and gate driver as well as providing power at an output pin for off-chip circuitry.
Six individual evaluation boards, EVLSRK1004A-F, are available to help quickly start new projects and identify the SRK1004 variant best suited to the converter circuit and MOSFET.
The SRK1004 is in production now, in a 6-lead thermally enhanced DFN package, from $0.36 for orders of 1000 pieces.
For more information please visit www.st.com/srk1004.
Alexander Jurman
STMicroelectronics
Alexander.Jurman@st.com
Legal Disclaimer:
EIN Presswire provides this news content “as is” without warranty of any kind. We do not accept any responsibility or liability
for the accuracy, content, images, videos, licenses, completeness, legality, or reliability of the information contained in this
article. If you have any complaints or copyright issues related to this article, kindly contact the author above.
