Intermediate bus PWM controller increases energy efficiency

Texas Instruments has introduced a pulse-width modulated (PWM) power supply controller for intermediate bus architectures.

Targeting telecom and data communication systems with multiple downstream point-of-load conversions, the UCC28230 is part of a portfolio of power management controllers, with this device being distinguished by its energy saving attributes – it is said to achieve up to 97 percent system efficiency in an intermediate bus architecture.

The UCC28230 PWM controller supports half-bridge and full-bridge topologies and, because it can operate in either a fixed volt-second or fixed frequency mode, boasts space savings as a smaller transformer can be used. Meanwhile, the UCC28230's start-up frequency control feature limits output inductor ripple current, allowing the use of a smaller, inexpensive inductor.

Among the UCC28230's energy saving features is the implementation of load-dependent dead-time control, which is said to improve efficiency over the entire output load range. It also has 1-D output that shorts the primary-side winding, keeping the self-driven synchronous rectifiers under control during start-up, shut-down and through transient conditions.

The UCC28230 has a 5-V reference voltage output for general-purpose voltage biasing, whilst its sister product, the UCC28231 , has a 3.3-V reference voltage output. TI suggests that both parts can be paired with the UCC27200 dual high-side, low-side driver to drive MOSFETs for half- and full-bridge topologies.

These controllers, which are already sampling, will be available in thermally-enhanced 3 mm x 2mm SON-12 and TSSOP-14 packages.

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