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Driver streamlines Class-D audio amplifier performance

Posted: 04 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Class-D audio amplifier driver? high bridge supply voltage? translators?

Supertex has introduced the MD7120, a high voltage, high speed, N-channel, full-bridge power MOSFET driver for use in Class-D audio amplifiers.

The MD7120 provides a broad range of output voltage from 12V to 200V, has 5ns dead time matching and rise or fall times of less than 30ns with a typical 1nF load. The N-channel MOSFETs are driven from normal logic level inputs by directly coupled internal level translators.

The MD7120 can be connected directly to a 200V supply voltage and can drive over 100W output with 90 percent efficiency. Its internal core consists of control logic, level translators, a bootstrap-powered high side gate driver and overtemperature, undervoltage and current protection circuits. The thresholds of the current protection for both the high and low sides are resistor-programmable.

According to Supertex, the MD7120 has been optimized for parameters critical to Class-D audio performance such as high efficiency and low EMI. In addition, it provides up to a 3A peak driving current with matched output resistance and channel-to-channel propagation delay for lower total harmonic distortion and noise, the company added.

The MD7120 is available in a 32-lead QFN package (MD7120K6-G). The part is Green and RoHS compliant.

Pricing starts at $5.20 each for the MD7120K6-G in 1,000 quantities. Samples are available from stock. Lead-time for production quantities is four- to six weeks ARO.

- Ismini Scouras

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