STMicroelectronics has introduced L6981 synchronous step-down regulators, extending the family of high-efficiency converters that simplify power supply design by integrating power elements, feedback circuitry and safety features on-chip. Rated to deliver up to 1,5 A, with 90% typical efficiency at full load, the L6981 converters are available in two variants optimised for light-load efficiency and noise performance, respectively.
The L6981C for low-current operation uses pulse skipping to maximise efficiency at light loads, extending the runtime of battery-powered devices. The L6981N prioritises low noise by operating permanently in PWM (pulse-width modulation) mode at a constant switching frequency and minimising voltage ripple at light loads.
Both variants can accept an input voltage from 3,5 V to 38 V, making them well suited to use in 24 V industrial bus-powered applications, 12 V and 24 V battery-powered equipment, HVAC power supplies, decentralised intelligent nodes, smart sensors and always-on applications. The output voltage can be adjusted from 0,85 V up to the input-voltage value using external resistors.
Integrated features include high-side and low-side NMOS power transistors, feedback loop compensation, over-voltage protection and thermal protection. There is also soft-start circuitry that limits inrush current and ensures a constant output voltage slope. An enable pin is provided, which permits power-up/power-down sequencing and allows a synchronising clock signal to be applied to the L6981N low-noise converters. The L6981 is included in ST’s 10-year longevity programme that ensures long-term component supply.
The STEVAL-L6981CDR evaluation board for the low-current converter and STEVAL-L6981NDR for the low-noise version are available to help designers accelerate device selection in power supply development.
Synchronous step-down power module 26 May 2021, NuVision Electronics
, Power Electronics / Power Management
The MPM3650C from Monolithic Power Systems is a fully integrated, high-frequency, synchronous, rectified step-down power module with an internal inductor. It offers a highly compact solution to achieve ...
Read more...Medical AC-DC power supplies 28 April 2021, Vepac Electronics
, Power Electronics / Power Management
Cosel announced the expansion of its medical power offering with the addition of the PJMA series. The 600 W PJMA600F and the 1000 W rated PJMA1000F have a universal input range of 85 to 264 V a.c. and ...
Read more...Dual-channel digital isolator 26 May 2021, Future Electronics
, Analogue, Mixed Signal, LSI
STMicroelectronics has begun volume production of the STISO621 dual-channel digital isolator, launching a new series of high-performance ICs for industrial applications and general optocoupler replacement.
...
Read more...Reliable grounding methods for high-voltage power supplies 26 May 2021, Vepac Electronics
, Editor's Choice, Power Electronics / Power Management
Proper ground connections between a power supply, AC mains input and the application’s load are essential for stable, reliable operation, but for HV (high voltage) supplies this is even more crucial. ...
Read more...PFC controller IC with boost diode 26 May 2021, MB Silicon Systems
, Power Electronics / Power Management
Power Integrations’ HiperPFS-4 power factor correction (PFC) controller IC is now available with an integrated Qspeed low reverse recovery charge (Qrr) boost diode. This combination delivers greater than ...
Read more...Programmable power supplies in new voltage ratings 26 May 2021, Accutronics
, Power Electronics / Power Management
New 50 V, 200 V, 400 V and 500 V models have been added to the 5 kW, 10 kW and 15 kW power platforms of the TDK-Lambda Genesys programmable DC power supply series, which target the automotive (component ...
Read more...Automotive magnetic position sensor 26 May 2021, Future Electronics
, Analogue, Mixed Signal, LSI
By offering accurate, contactless angle measurements in demanding automotive applications such as high-speed motors, the new AS5116 magnetic rotary position sensor from ams enables automotive manufacturers ...
Read more...Synchronous DC-DC inverting converters 26 May 2021, CST Electronics
, Power Electronics / Power Management
The MAX17577 and MAX17578 from Maxim Integrated Products are claimed to be the industry’s smallest, highest-efficiency synchronous inverting DC-DC step-down converters. As Maxim’s first 60 V inverting ...
Read more...Power module gate driver and isolation board 26 May 2021, NuVision Electronics
, Power Electronics / Power Management
The new Si823Hx gate driver board from Silicon Labs is an all-in-one isolation solution perfectly suited for the recently launched Wolfspeed WolfPACK power module. Wolfspeed power modules are used across ...
Read more...Turnkey DC power rack and cabinet systems 26 May 2021, Vepac Electronics
, Power Electronics / Power Management
EA’s flexible high-power DC supplies and electronic loads are integrated into 19-inch rack power supply or closed cabinet solutions and can be cost-effectively adapted to a wide variety of user requirements, ...
printer friendly version