National Semiconductor Corp. (Santa Clara, CA) introduced its LM5025 integrated 100V pulse-width modulation (PWM) controller for forward converters with the active clamp/reset technique used in distributed power architectures. The new device is designed for high switching frequencies and provides high efficiencies and power densities in communications, automotive, distributed and industrial power systems, and multi-output power supplies.
The LM5025 integrates a 100V startup bias regulator and a user programmable oscillator operating at 1MHz, and exhibits total propagation delays of less than 100nS, qualifying the device for a vast array of 48V communication, isolated power supply applications. With the active clamp output, the LM5025 can be configured to provide either overlap time (for p-channel switch applications) or dead-off time (for n-channel switch applications). National's 3A peak-compound, gate driver technology makes the LM5025 suitable for direct drive of a high-power MOSFET, reducing board space and leading to increased power density compared to alternative PWM controllers that require the addition of a gate driver chip.
Available and shipping now, the LM5025 is offered in a tiny LLP-16 or a TSSOP-16 package. It is priced at $1.30 each in 1,000-unit quantities.