Texas Instruments' Power Supply Controller Achieves 97% Efficiency

(Product News, 9 Jun 2008)

Texas Instruments Inc. (TI) has launched a power supply controller for unregulated output voltages that achieves up to 97 percent system efficiency in an intermediate bus architecture. The controller allows intermediate bus architecture power systems to combine the highest amount of energy savings, high power-density and low system costs in telecom and data communication systems with multiple downstream point-of-load conversions.

The integrated UCC28230 pulse-width modulator (PWM) power controller supports both the half-bridge and full-bridge topologies and reduces overall size and the need for external components. Designers can set the operation to work in a fixed volt-second or fixed frequency mode, which reduces the size of the transformer.

The UCC28230 has a start-up frequency control feature, and implements load-dependent dead-time control to improve efficiency over the entire output load range. It also has 1-D output that shorts the primary-side winding, which keeps the self-driven synchronous rectifiers under control during start-up and shut-down and through transient conditions.

The UCC28230 includes a precision 5V reference voltage output for general-purpose voltage biasing. In addition, the UCC28231 includes a precision 3.3V reference voltage output for the same purpose. For added flexibility, the controller can be paired with Texas Instruments' UCC27200 dual high-side, low-side driver to drive MOSFETs for half- and full-bridge topologies.

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