Communications Power

TI Unveils High-Performance PWM Controller

Texas Instruments Inc. (TI, Dallas, TX) announced its new UCC2540 power management integrated circuit for high-density, low-output voltage converters. The new secondary-side, voltage-mode, synchronous, pulse-width modulation (PWM) buck controller simplifies design of applications with multiple output power supplies, such as telecom and data communications modules, industrial supplies, computers, test and medical instrumentation, and merchant power supplies.

The UCC2540 controller is a secondary-side control device with dual ±3 A TrueDrive outputs for the design of multiple power stages that can deliver currents up to 50 A and output voltages as low as 0.7 V. Capable of supporting a wide input supply voltage range of 2.7 V to 35 V, the controller can operate from a 3.3 V bus, versus competing devices that run from a 5 V or higher voltages. The device drives two external n-channel MOSFETs synchronously at a switching frequency up to 1 MHz to deliver high current at high efficiencies, while minimizing the size of inductors and capacitors.

Suitable for generating auxiliary outputs as a secondary-side post regulator for multiple output power supplies, the UCC2540 controller achieves high power efficiency. In addition, the UCC2540 can be used in two-stage, cascaded topologies as the local secondary-side controller for the main output in isolated, high-performance, dc-dc converters. The controller can take synchronization input directly from a pulsed-rectified voltage from the secondary winding device or from a pulse transmission from the primary side PWM controller.

The UCC2540 is shipping in volume now. The device is rated for operation from -40 °C to +105 °C, and is available in a 20-pin, thermally enhanced, HTSSOP PowerPAD package with 1.4 °C/W. Pricing is $1.85 in quantities of 1,000 units.

Texas Instruments Inc.
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