National Semiconductor Intros New LM5115 Controller
National Semiconductor Corp. (Santa Clara, CA) introduced its new LM5115 controller, which can be used as either a secondary-side post regulator (SSPR) or as a stand-alone buck regulator. Applications for the LM5115 include multi-output dc-dc power modules and wide-input-range dc-dc power sources for industrial and consumer electronic products.
When paired with National’s LM5025 primary-side regulator, the LM5115 SSPR enables designers to develop synchronized, efficient, multiple-output dc-dc power supplies. Used in the stand-alone configuration, the LM5115 operates as a high-voltage (75 V) synchronous buck controller.
The LM5115 features operation from ac or dc input up to 75 V peak; synchronization to the main channel dc-dc converter; optional free-run mode for stand-alone operation from dc input; voltage-mode, pulse-width modulation with input voltage feed-forward; boot-strapped, high-side and low-side MOSFET drivers that sink 2.5 A peak; precision reference that provides an accurate 0.75 V feedback threshold; an output voltage adjustable from 0.75 V to 12 V; and an error amplifier with a wide 4 MHz bandwidth.
The new LM5115 is available in a tiny, thermally enhanced, 16-lead, LLP® package, which is priced at $1.50 each in 1,000-unit quantities.
