Highly integrated PWM controllers

Power Electronics / Power Management

6 February 2008 Power Electronics / Power Management

STMicroelectronics has extended its portfolio of power management devices with a new family of flexible and high-performance PWM (pulse width modulation) controllers intended for motherboard and POL (point of load) markets. Four new products - L6726A, L6727, L6728 and L6728A - integrate a voltage reference, control logic, gate drivers, monitoring and protection circuits into standard SO-8 or tiny 3 x 3 mm DFN packages. Two of the chips offer additional features for high-level applications, including a PowerGOOD output to report power status and the output voltage sense for accurate over-voltage and under-voltage protection.

The L6726A and L6727 are low-cost single-phase PWM controllers, with embedded high-current drivers, enabling the easy creation of general purpose DC-DC step-down converters with excellent performance for a broad range of applications - from desktop PC sub-systems, such as memories and chipsets, to general-purpose power supplies.

The L6728 and L6728A add to the simpler devices the characteristics required by the high-end motherboard market, including plus or minus 0,8% voltage accuracy over line and temperature variations, a PowerGOOD output to provide realtime information on output-voltage status, and the chip-scale 10-lead DFN package. They offer a fixed-frequency 300 kHz (L6728) or 600 kHz (L6728A) oscillator, for simple but flexible application design. These devices are particularly suited to servers and niPOL (non-isolated point of load) applications.

With embedded high-current, high-speed N-channel MOSFET drivers, the chips can be used in the design of power applications driving from several Amps to more than 30 Amps. They operate over a wide input voltage range of 1,5 V to 18 V, while the integrated 0,8 V voltage reference ensures 1% (L6726A, L6727) or up to 0,8% (L6728, L6728A) output accuracy. Sensorless current monitoring, through a low-side power MOSFET, avoids the cost of an external current-sensing resistor and saves board space, and the single- or dual-level over-current protection has programmable thresholds. A range of other features is designed to increase efficiency and reduce the external component count.

Share this article:

Solving South African power problems with locally built intelligence
Editor's Choice Power Electronics / Power Management
Smart metering infrastructure in South Africa remains patchy. The rollout has been slow, coverage is inconsistent, and for the most part, granular per-unit measurement simply does not exist.

Read more...

Wide range power module
Power Electronics / Power Management
The latest DC-DC modules from Würth Elektronik are characterised by high resilience to voltage transients on the 24 V bus and an extremely wide input-voltage range from 3,5 V to 38 V.

Read more...

Selecting primary batteries for maximum service life
Uniross Batteries Power Electronics / Power Management
Primary batteries play an important role in IoT applications. Designed for longevity, they have a high-energy capacity and are often used in standalone applications where charging is impractical or impossible.

Read more...

4 kW e-mobility DC-DC converter
Brabek Power Electronics / Power Management
The RECOM RMOD4000 series of compact, plug-and-play DC-DC converters is a cost-effective solution to provide isolated 14 V, 28 V, or 56 V DC network rails from a high input voltage between 180 and 950 V DC.

Read more...

Aluminium case upgrade boosts performance
Vepac Electronics Power Electronics / Power Management
The SQBF Quarter Brick 300 W DC to DC Converter is now available in a newly upgraded metal case designed to deliver improved durability and superior electrical performance across demanding applications.

Read more...

Extending the range of power converters
RS South Africa Power Electronics / Power Management
Power Integrations recently announced a breakthrough in flyback topology extending the power range of flyback converters to 440 W - well beyond the limits that traditionally required more complex resonant and LLC topologies.

Read more...

Categories

Power Electronics / Power Management

Highly integrated PWM controllers

Further reading:

Publications by Technews