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Monolithic two-switch forward DC/DC regulator rolls

Posted: 19 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC regulator? power supply designs? switch-mode regulator?

LM5015

National Semiconductor Corp. has introduced the industry's first high-voltage, monolithic two-switch forward DC/DC regulator for power supply designs in telecommunication, automotive and industrial applications.

LM5015 features an ultrawide input voltage range from 4.25V to 75V and maximum switching frequency to 750kHz. The device 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 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.

The LM5015 is available now and priced at $2.05 each in 1,000-unit quantities.




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