IR Introduces Integrated and Protected Class D Audio Chipset for Small, High Performance Amplifiers

Flexible Chipset Can Scale to Address Applications from 50-500W by Simply Replacing MOSFETs

EL SEGUNDO, Calif. — International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced a chipset featuring the new IRS2092 integrated audio driver IC with protected PWM switching and IR’s full complement of digital audio MOSFETs. The chipset targets medium power, high performance Class D audio amplifiers from 50W to 500W in home theatre, home stereo, active speaker, musical instrument, and professional audio applications.

“IR’s new chipset brings the audio efficiency and size advantages of Class D to high performance amplifiers, significantly shrinking the overall board area required by Class AB designs, without compromise to audio performance,” said Stephane Ernoux, marketing director for IR’s audio products. “Better still, the IC simplifies the designer’s job by delivering a flexible “building block” approach complete with protection, deadtime, and PWM modulator which can easily scale to address changing design needs by simply replacing MOSFETs,” he added.

The new chipset forms a Class D audio solution that is much smaller than a comparable Class AB design. In a 100W application, for example, the IRS2092 IC and IRF6645 DirectFET® MOSFETs reduce board size by 60% and eliminate 20% of the parts from the typical bill of materials.

IRS2092 Audio IC Technical Details

Based upon a half bridge topology, the new audio driver IC integrates four essential functions for Class D design implementation including error amplifier, PWM comparator, gate driver, and robust protection circuitry. As a result, this compact 16-pin IC offers high noise immunity and reduced start and stop click noise, while greatly reducing some of the most complicated and costly design tasks such as overload protection.

Key IRS2092 features include an analog PWM modulator with frequency up to 800 kHz, programmable bidirectional over-current protection (OCP) with self-reset control, under-voltage lockout protection (UVLO), and programmable preset deadtime for a scalable power design.

Digital Audio MOSFET Technical Details

The IC may be paired with an extensive range of digital audio MOSFETs addressing output power from 50W to 500W. These MOSFETs, part of IR’s IRFI4x, IRFB422x, and DirectFET families, have been optimized around parameters critical to audio performance such as efficiency, THD, and EMI.

IRAUDAMP5 Reference Design

The IRAUDAMP5 reference design speeds development and evaluation. Based upon the IRS2092 IC and the IRF6645 DirectFET power MOSFETs, the two-channel design is a 120W half-bridge power amplifier which may be scaled for power and number of channels, and requires no heatsink under normal operating conditions. The design offers an efficiency of 96% at 120W in the MOSFET stage, and a THD+N of 0.005% at 1 kHz, 60W, four ohms, (both typical).

IC Specifications
Part Number Offset Voltage Sink/Source Current VccRange (with UVLO) Min/Max Output Voltage Selectable Dead Time Logic Compatible Input
IRS2092(S)PBF +/-100V 1.2/1.0A 10-18V 10-18V 25/45/75/105ns 3.3/5.0V

MOSFET Specifications
Part Number Package Bvdss Rds(on) typ. @10v Id@Tc = 25°C Qg typ
IRF6645 DirectFET SJ 100V 28mOhms 25A 14nC
IRF6665 DirectFET SH 100V 53mOhms 19A 8.7nC
IRF6775M DirectFET MZ 150V 47mOhms 28A 25nC
IRF6785M DirectFET MZ 200V 85mOhms 19A 26nC
IRFB4227PBF TO220-AB 200V 20mOhms 65A 70nC
IRFI4024H-117P TO-220 Full-Pak 5P 55V 48mOhms 11A 8.9nC
IRFI4212H-117P TO-220 Full-Pak 5P 100V 58mOhms 11A 12nC
IRFI4019H-117P TO-220 Full-Pak 5P 150V 80mOhms 8.7A 13nC
IRFI4020H-117P TO-220 Full-Pak 5P 200V 80mOhms 9.1A 19nC

Availability and Pricing

IRS2092 is priced at US $2.70 each in 10,000-unit quantities. Pricing for the MOSFETs range from US $0.65 to $1.25 each, all in 10,000-unit quantities. Pricing is subject to change without notice. Production orders are available immediately.