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DC/DC Converters from TI have Dual Outputs for Digital TVs and Set-Top Boxes

1st November 2007

ES Admin

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Texas Instruments has introduced four dual-output SWIFT DC/DC step-down converters with integrated FETs that deliver 2 A and 3 A of continuous output current and support input voltages of 4.5 V to 28 V. The simple-to-design switchers, which come in a monolithic package, speed time to market, reduce external component count and help reduce cost for point-of-load systems used in a wide variety of applications including HDTVs, set-top boxes and other consumer electronic systems. See: www.ti.com/dualswift.

TI’s new 2-A TPS54283 and TPS54286 and 3-A TPS54383 and TPS54386 SWIFT converters reduce input capacitance by switching each output at 180° out-of-phase at a frequency of 300 kHz and 600 kHz. Each device features current mode control and integrates the compensation components to lower the total number of required external parts. A unique sequencing pin helps designers meet critical sequencing requirements without additional circuitry by allowing the user to select which output ramps up first or to program both outputs to ramp ratio-metrically.

TI’s new dual-channel, non-synchronous converters provide high efficiency and 1.5 percent output voltage accuracy (down to 0.8 V) for each output. With three selectable levels of over-current protection, low on-resistance and a thermal shutdown of 145°C, the devices excel in hot environments where good thermal performance is needed, such as a DLP® high-definition digital TV that operates without the use of a cooling fan.

Designers who use the SWIFT converters can take advantage of interactive software and other design resources. The SwitcherPro™ software tool is available free through www.ti.com/analogelab. The interactive tool includes a bill of materials, reference schematic, loop response graphs and an efficiency curve based on the designer’s input. Additionally, more than a dozen application notes and evaluation modules on TI’s TPS54xxx family of SWIFT ICs are available for download via www.ti.com/swift.