National Semiconductor Introduces High-Voltage, Monolithic Two-Switch Forward DC-DC Regulator

Santa Clara, CA - National Semiconductor Corporation recently introduced the industry's first high-voltage, monolithic two-switch forward DC-DC regulator for power supply designs in telecommunication, automotive and industrial applications. The highly integrated LM5015 features an ultra-wide input voltage range from 4.25V to 75V and maximum switching frequency to 750 kHz. The LM5015 enables easy implementation of either isolated or non-isolated DC-DC converters using a minimum of external components.

Offered in a small TSSOP package, the LM5015 integrates two 75V N-Channel MOSFET switches for a reduced system component count and very small solution size. The two-switch forward architecture reduces system losses and noise. The LM5015 joins National's high-voltage DC-DC regulator product line which includes the LM5001 and LM5002 high-voltage switch-mode regulators.

Key Features and Benefits

The LM5015 high-voltage switch-mode regulator features all of the functions necessary to implement efficient two-switch forward and two-switch flyback power converters with a minimum of external components. The easy-to-use regulator integrates high-side and low-side 75V N-Channel MOSFETs with a minimum 1A peak current limit. The voltage across the MOSFETs employed in the two-switch topology is clamped to the input voltage, allowing the input voltage range to approach the rating of the MOSFETs. The regulator control method is based on current-mode control, providing inherent ease-of-loop compensation and line feed-forward for superior rejection of input transients.

The operating frequency of the LM5015 is set with a single resistor and is programmable up to 750 kHz. The oscillator can also be synchronized to an external clock. Additional protection features include cycle-by-cycle current limiting, thermal shutdown, under-voltage lockout and remote shutdown capability. The LM5015 is offered in a 14-pin TSSOP package featuring an exposed die attach pad to enhance thermal dissipation.

For more information on the LM5015 or to order samples and an evaluation board, visit http://www.national.com/pf/LM/LM5015.html.

About National's Power Management Products

National solves power management design problems in space- and energy- constrained applications from feature-rich handheld devices through large line-powered systems. From the novice power designer to the power expert, National's products, people and design tools enable customers to design green-powered systems with complex power supplies in the shortest amount of time. High-performance products include switching regulators such as National's flagship SIMPLE SWITCHER family, and application-specific products including white-LED drivers and Power-over-Ethernet controllers. More information about National's power management products is available at http://www.national.com/power.

SOURCE: National Semiconductor Corporation