Power Modules Suit Systems Without Airflow

National Semiconductor has introduced three Simple Switcher power modules, designed to drive high output voltage applications in the industrial, communications infrastructure and military markets. The easy-to-use LMZ14201H, LMZ14202H and LMZ14203H power modules are said to provide the efficiency of a synchronous switching regulator with the simplicity of a linear regulator. This eliminates the external inductor and complex layout placement challenges typical of switching regulator designs.

The LMZ14201H, LMZ14202H and LMZ14203H accept an input voltage rail between 6V and 42V and deliver an adjustable and accurate output voltage up to 24V. A single resistor adjusts the switching frequency to enable greater flexibility of design. Pin-to-pin compatible with other range members, the modules integrate a shielded inductor and feature efficiency up to 97 per cent. The integrated inductor alleviates EMI concerns as the modules comply with both CISPR 22 Class B radiated and conducted emissions standards.

The LMZ14201H, LMZ14202H and LMZ14203H drive loads from 1A to 3A and are well suited to generate intermediate bus voltages in systems using a distributed point-of-load (POL) architecture. High efficiency and good thermal performance make the modules suitable for systems without airflow. In addition, the products used in conjunction with an application-specific circuit can generate a -15V bias supply so audio amplifiers, such as National Semiconductor's LME49880, achieve a wider dynamic range. National's power modules are available now in a seven-pin, RoHS compliant, 10.16 x 13.77 x 4.57mm package with exposed-bottom pad.

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