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Harry Feltges, Marketing Manager Infrared Devices at OSRAM commented “Designed with automotive applications in mind, the total height of the new SFH 4236 is about 35% smaller compared to conventional DRAGON solutions with an external lens”.


The 850 nm IR DRAGON series consists of the standard version SFH 4232, the stack version SFH 4235 with twice the total radiant flux and the new SFH 4236.


Avago launch 3 Miniature Precision Isolation Amplifiers


Avago Technologies Launches Three Precision Isolation Amplifiers for Industrial Motor Control and Renewable Energy Markets Optical Isolation Amplifiers with Increased Accuracy, Faster Response Time and Smaller Footprints


Avago Technologies, a leading supplier of analog interface components for communications, industrial and consumer applications, have announced three Miniature Precision Isolation Amplifiers with increased accuracy, bandwidth and high insulation made possible by proprietary optical isolation technology.


Based on sigma-delta analog-to-digital converters and chopper stabilized amplifiers, the new isolation amplifiers feature high gain accuracy, low temperature drift, 3.3 V/5 V output supply operation and a wide -40 to +105°C operating temperature range. These features are delivered in a stretched SO-8 package that has a footprint 30% smaller than the standard DIP-8 package. When mounted on a PCB, it occupies a space that is a fraction of that for a traditional Hall Effect or transformer based isolation amplifier.


The series is implemented with a fully differential circuit topology with a gain accuracy of ±0.5% (ACPL-C79B), ±1% (ACPL-C79A), and ±3% (ACPL-C790). Normalized gain drift is -50 ppm/°C. With a 200 kHz bandwidth and


94 www.compoundsemiconductor.net June 2010


1.6 µs response time, the ACPL-C79x captures transients during short circuit and overload conditions. Operating from a single 5 V supply, the isolation amplifier series features an excellent nonlinearity of 0.05% and a SNR of 60 dB.


The ACPL-C79x high common-mode transient immunity of 15 kV/µs provides the precision and stability needed to accurately monitor current in high noise motor control environments. This ensures smoother control with less “torque ripple” in many motor control applications.


Pending safety and regulatory approvals include:


•IEC/EN/DIN EN 60747-5-5: 1140 Vpeak working insulation voltage •UL 1577: 5000 Vrms/1 minute double protection rating •CSA: Component Acceptance Notice #5


Isolation Amplifier Applications and Markets


Widely used for motor phase and rail current sensing, servo motor drive, switching power supply feedback isolation, DC link voltage monitoring, inverter current sensing and switching power supply feedback isolation, the ACPL-C97x targets industrial automation and instrumentation, renewable energy, and HVAC markets.


In a typical motor drive application, currents through a small value current sense resistor cause a voltage drop that is sensed by the ACPL-C79x isolation amplifier and a differential output voltage, proportional to the current, is created on the output side of the isolation barrier.


Key Features


•High gain tolerance options: ±0.5% (ACPL- C79B), ±1% (ACPL-C79A), and ±3% (ACPL-C790)


•High Signal-to-Noise ratio: 60 dB


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