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Power/Alternative Energy??

Regulators offer flexibility for DC/DC designs

Posted: 06 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulators? DC/DC? Webench? Simple Switcher? National?

Buck regulators from National

National Semiconductor Corp. has announced the addition of six high-frequency buck regulators to its Simple Switcher product family along with a "dial-in" performance enhancement to its Webench design environment. The six new regulators feature a unique combination of high performance, flexibility and ease-of-use for DC/DC power supply designs, said the company.

National said its new buck regulators and enhanced Webench suite of tools enable novice as well as seasoned power supply designers to easily "dial-in" their size and efficiency requirements while also realizing fast time-to-market. Design results are verified by Webench online electrical and thermal simulations and created for 24-48hr delivery using the BuildIt! custom prototype power supply kit.

Emulated current mode
The new regulators operate with an input voltage range up to 75V and deliver up to 3A of continuous output current. The patented emulated-current-mode technology promises superior load transient response in low duty cycle applications that are not addressable by traditional current mode control. Operating frequency is adjustable from 50kHz to 1MHz, providing industry-leading dynamic range. To reduce EMI, a frequency synchronization pin allows multiple ICs from the family to self-synchronize or to synchronize to an external clock. The new regulators promise robustness with cycle-by-cycle current limit, short-circuit protection and thermal shutdown.

"Combined with National's Webench suite of tools, Simple Switcher regulators allow design engineers to make decisions about their power supply design, such as the trade-off between size and efficiency," said Mal Humphrey, product line director for National's power management group. "Any engineer, including seasoned power supply designers, can create, optimize and analyze their design in just one minute.

The six products in the new line of Simple Switcher regulators are the 0.5A LM5574, 1.5A LM5575 and 3.0A LM5576 buck regulators, which feature an input voltage range of 6-75V and adjustable switching frequency between 50kHz and 500kHz; and the 0.5A LM25574, 1.5A LM25575 and 3.0A LM25576 buck regulators that feature an input voltage range of 6-42V and adjustable switching frequency between 50kHz and 1MHz.

Flexible options
Offered in a 16-pin TSSOP, the LM5574 integrates a 75V, 750 milliohm n-channel MOSFET and the LM25574 integrates a 42V, n-channel MOSFET. Offered in a 16-pin TSSOP package with exposed pad, the LM5575 integrates a 75V, 330 milliohm, n-channel MOSFET and the LM25575 integrates a 42V, n-channel MOSFET. Offered in a 20-pin TSSOP package with exposed pad, the LM5576 integrates a 75V, 170 milliohm, n-channel MOSFET and the LM25576 integrates a 42V, n-channel MOSFET. All of these new regulators are available for simulation on National's Webench design tool.

National's six new Simple Switcher regulators are available today. Prices for the products range from $1.35 to $2.90 in 1,000-unit quantities.




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Related Datasheets
Part Number Description Category
? LM5574 SIMPLE SWITCHER? 75V, 0.5A Step-Down Switching Regulator from the PowerWise? Family ICs, Interface
? LM5575 SIMPLE SWITCHER? 75V, 1.5A Step-Down Switching Regulator from the PowerWise? Family ICs, Interface
? LM5576 SIMPLE SWITCHER? 75V, 3A Step-Down Switching Regulator from the PowerWise? Family ICs, Interface
? LM25575 SIMPLE SWITCHER? 42V, 1.5A Step-Down Switching Regulator from the PowerWise? Family ICs, Interface
? LM25574 SIMPLE SWITCHER? 42V, 0.5A Step-Down Switching Regulator from the PowerWise? Family ICs, Interface
? LM25576 SIMPLE SWITCHER? 42V, 3A Step-Down Switching Regulator from the PowerWise? Family ICs, Interface

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