A driver IC for high performance Class D Audio applications from 50 W to 150 W including home theater systems and car audio amplifiers has been introduced by International Rectifier.
Based upon a half bridge topology, the IRS2093 integrates four channels of high-voltage, high performance Class D audio amplifier drivers with PWM modulators in a single IC. Housed in a compact MLPQ48 package, the new IC shrinks board size by a further 50 percent compared to previous offerings.
“With the addition of an external MOSFET and passive components, a complete four channel Class D audio amplifier can be realized in a 50 percent smaller footprint, delivering the efficiency and size advantages of Class D while providing the high audio performance traditionally associated with Class AB solutions,” said Jun Honda, IR's systems engineering manager, Energy Saving Products Business Unit.
The IRS2093 offers error amplifier, PWM comparator, gate driver, and robust protection circuitry. In addition the new 200 V device features 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.
The IC may be co-designed with IR's extensive range of digital audio MOSFETs addressing output power from 50 W to 150 W. These MOSFETs have been optimized around parameters critical to audio performance such as efficiency, THD, and EMI.
Specifications
Class D Audio IC
| Part Number | Package | Channels | Offset Voltage | Sink/Source Current | VCC Range (with UVLO) | Output Voltage Min/Max | Selectable Dead Time |
| IRS2093MPbF | MLPQ48 | 4 | 200V~+/-100V | 0.6/0.5A | 10-15V | 10-15V | 45/65/85/105ns |
MOSFET Specifications
| Part Number | Package | Bvdss | Rds(on) typ. @10 v | Id@Tc = 25 degrees C | Qg typ |
| IRF6645 | DirectFET SJ | 100 V | 28 mOhms | 25 A | 14 nC |
| IRF6665 | DirectFET SH | 100 V | 53 mOhms | 19 A | 8.7 nC |
| IRF6775M | DirectFET MZ | 150 V | 47 mOhms | 28 A | 25 nC |
| IRF6785M | DirectFET MZ | 200 V | 85 mOhms | 19 A | 26 nC |
| IRFI4024H-117P | TO-220 Full-Pak 5P | 55 V | 48 mOhms | 11 A | 8.9 nC |
| IRFI4212H-117P | TO-220 Full-Pak 5P | 100 V | 58mOhms | 11 A | 12 nC |
| IRFI4019H-117P | TO-220 Full-Pak 5P | 150 V | 80 mOhms | 8.7 A | 13 nC |
| IRFI4020H-117P | TO-220 Full-Pak 5P | 200 V | 80 mOhms | 9.1 A | 19 nC |
Reference Design
IRAUDAMP8
Four-channel 120 W Half-bridge Class-D Audio Power Amplifier
- 120 W x 4 channels, (THD=1 percent, 1 kHz, 4 Ohms)
- 0.015 percent THD+N distortion @ 60 W, 4 Ohms
- Residual noise 200 uV, IHF-A weighted, AES-17 filter
- 90 percent Efficiency @ 120 W, 4 Ohms, Class-D Stage
- OCP, OVP, UVP and OTP
- Self-oscillating half-bridge topology with optional clock synchronization
- Featuring IRS2093M Controller and Gate Driver IC and IRF6665 DirectFET MOSFETs.
Availability and Pricing
Pricing for the IRS2093 begins at US $10.80 in 10,000-unit quantities. The IRAUDAMP8 reference design is priced at US $294.00. Production orders are available immediately. The devices are RoHS compliant and industrial qualified.
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