TI has released the industry's first power management chipset that provides intelligent digital control and unique body diode sensing capabilities.

This chipset optimizes secondary synchronous rectification of next-generation AC/DC and isolated DC/DC power supplies through these functions.

The UCD3138A digital controller and UCD7138 low-side gate driver increase system efficiency and halve synchronous rectification MOSFET voltage stress compared to other digital power solutions.

Precisely controlling dead time in synchronous rectifiers can minimize power loss and reduce the risk of MOSFET failure.

The UCD3138A and UCD7138 chipsets dynamically optimize dead time by using body diode voltage information in fast digital control algorithms, compensating for differences in power stage components during mass production without correction or screening.

Therefore, telecommunications and server finished product manufacturers can more easily launch power supplies with an energy efficiency rating of 80 PLUS Titanium, and information technology service providers can reduce energy costs.

Lee Won-seop, a manager at TI, stated that the application targets for the UCD7138 and UCD3138 are products with power ratings of tens to hundreds of kilowatts or more, adding, "In these application fields, even a small efficiency improvement of about 0.5% can bring about a significant change in power consumption."

Key Features and Advantages

Optimizes dead time through intelligent diode voltage sensing. By adjusting timing to minimize diode conduction, it enhances efficiency and reliability and eliminates noise issues found in conventional MOSFET VDS-ON sensor devices.

High peak current supports a wide load range. The UCD7138's asymmetric, rail-to-rail 4A source and 6A sink peak current drive supports a load range from hundreds of watts to 1 kilowatt when using multiple parallel FETs.

Realizes fast and efficient switching performance with an ultra-compact solution. It can handle large currents in the industry's smallest 3mm x 3mm QFN package, and when placed alongside synchronous rectifier MOSFETs, it reduces parasitic inductance and saves board space.

It operates efficiently at a maximum frequency of 2 MHz. With the hardware peripherals of the UCD3138A, very high frequencies can be used with the UCD7138's 14 ns propagation delay, rapid rise/fall time, and minimized tolerance.

Along with these chipsets, TI recently released a new solution for lower-power AC/DC flyback converters. The new UCC24630 synchronous rectifier controller provides maximum efficiency with low sensitivity to board layout and MOSFET package parasitic factors.

In addition, the automatic low-power detection function and 110uA standby current allow developers to easily achieve very low standby power consumption.

Tools and Support

Developers use TI's Code Composer Studio (CCS) integrated development environment (IDE) to rapidly develop and debug applicationsIt can be done. In addition, you can refer to the TI Designs 340W Digital Control LLC Resonant Half-Bridge DC/DC Power Conversion Reference Design.

The UCD3138A and UCD7138 devices are currently available at the TI store and authorized TI distributors. The UCD7138 MOSFET driver is available in a 6-pin QFN package and is priced at $1.10 per 1,000-unit quantity. The UCD3138A digital controller is available in a 40-pin QFN package and is priced at $3.22 per 1,000-unit quantity.