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PWM stabilizer with sequencer and auto-tracking

28.07.2008

ON Semiconductor has introduced the NCP312x family of two-terminal pulse-width buck regulators that provide auto-tracking and sequencing capabilities.

Based on integrated MOSFETs providing 2 A (NCP3120, NCP3122) or 3 A (NCP3121, NCP3123) output current with switching frequencies up to 2,2 MHz, these components are suitable for use in a variety of systems. Auto-tracking and sequencing capabilities make precise timing and control of both output channels possible.

A digital signal processor or a user-programmable logic array requires versatile power supplies that deliver different levels of current with specific timing for each. This timing prevents non-operating conditions that could cause the system to fail in a working environment.

The NCP312x range provides programmable gain detection, serial control, and distortion control to control voltage behavior during start-up and shutdown. In addition, multiple components in the NCP312x range can be daisy-chained to drive a multi-channel output. This family of converters reduces input capacitance requirements by switching 180° on phase misalignment from 200 kHz to 2,2 MHz. This common-mode operation allows a single inexpensive electrolytic or ceramic capacitor to be used for the input filter instead of two capacitors in the standard configuration.

The outputs can also be paralleled, which provides for the installation of one two-phase regulator with low ripple voltage. Models NCP3120, NCP3121, NCP3122 and NCP3123 are available in QFN-32 packages.

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