NS Introduces 100V Active Clamp PWM Controller

National Semiconductor introduced a highly integrated 100-volt pulse width modulation (PWM) controller. This controller designed for forward converters uses the active clamp/reset technology commonly used in power distribution structures. It not only supports higher switching frequency, but also outperforms traditional ones in both efficiency and power density. The forward voltage regulator is best suited for communication systems, automotive, power distribution and industrial power supply systems, and multi-output power supplies.
Active clamping technology is one of the most commonly used single-ended layouts for power distribution structures to ensure that the converter can operate with more than 50% duty cycle, and also ensures that the primary and secondary coils of the transformer are larger. Turns ratio. Since National Semiconductor uses the latest high voltage (100V) precision analog bipolar CMOS-DMOS process technology, this LM5025 controller chip can operate over a wide input voltage range of 13V to 100V, eliminating the need for customers The addition of a bias voltage regulator chip helps to reduce the area of ​​the printed circuit board.
National's LM5025 pulse-width modulation controller includes a 100-volt start-up bias regulator and a user-programmable 1MHz oscillator. The overall propagation delay is less than 100ns, making it suitable for a variety of 48-volt applications. Divided power supply designed communication system. This LM5025 chip, which supports an active clamp output, can be reconfigured to provide overlap time for P-channel switching systems or dead time for N-channel switching systems. The LM5025 chip uses National Semiconductor's unique composite gate driver technology with a peak current of up to 3A, thus enabling direct drive of high-power Metal Oxide Semiconductor Field Effect Transistors (MOSFETs). The advantage is that it can reduce the board's board space and increase the power supply density, which is wider than other pulse widths that require additional door drivers.