Santa Clara, Calif. - National Semiconductor positions its LM5033 as the first fully-featured 100-volt DC/DC pulse width modulation (PWM) controller for meeting the needs of modern intermediate bus architectures (IBAs). The LM5033 can be used as a stand-alone device in a push-pull bus converter or paired with one or two of the company's LM5100 drivers in a half- or full-bridge converter design. This flexibility allows designers to produce a family of bus converters suited to a wide range of low-voltage telecom, automotive, and industrial applications.
"The introduction of the intermediate bus is an inflection point in the evolution of distributed power architectures," said Paul Greenland, marketing director for the Power Management group. "Customers expect the next generation of intermediate bus converters to be flexible and efficient without sacrificing real estate. The LM5033 is an optimum solution because of a flexible architecture that enables designers to use it in three different topologies."
Designed with the company's Analog-BiCMOS-DMOS high-voltage process technology, the LM5033 operates off a wide-range input (15 to 100 volts) for lower component count and higher efficiency. The highly integrated, voltage-mode PWM controller features efficient operation up to 1 MHz (set by a single resistor), which shrinks power transformer and filter components to save space and improve transient response. It sports less than 100 ns propagation delay. Its 1.5-amp MOSFET output stages provide substantial drive for external high-power MOSFETs. The LM5033 may be applied in synchronous topologies, which reduces EMI, crosstalk and interference, and permits blanking during the power-switching interval in sensitive load circuits. Current-sense circuitry with front-edge blanking protects the power switches without tripping on the leading-edge spike, while the device's hiccup mode reduces device stress and power dissipation during overload or short-circuit conditions. Other features include a soft-start function, which reduces in-rush current and permits sequencing and direct control of the output stages. Under-voltage lock-out with hysteresis prevents malfunctions during start-up or brown-outs.
Available now, National's LM5033, in a 10-lead LLP, is priced at $1.10 each in 1K volumes. The LM5100 is also available in an SOIC or LLP package at $1.35 each in 1K volumes.