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Isolated Error Amplifiers From Analog Devices Outperform Optocouplers And Shunt Regulators

Analog Devices, Inc. have today announced the release of new isolated error amplifiers that provide power supply designers with a higher performing, single-chip alternative to isolation techniques based on optocouplers and shunt regulators. Designed for linear feedback power supplies using primary side controllers, the ADuM3190 and ADuM4190 isolated error amplifiers have a 400-kHz bandwidth, with 0.5% typical initial accuracy at 25°C and 1% total accuracy over the extended temperature range.

Optoelectronics

27 February 2013

byNews Desk

This provides manufacturers of ac-to-dc and dc-to-dc power supplies, including those that are DOSA-compliant, with a significant upgrade in speed and operating temperature range, as well as a 5× improvement in transient response.

Designed with ADI’s iCoupler? digital isolation technology, the ADUM3190 and ADuM4190 eliminate the CTR of optocouplers that degrades over the lifetime of the devices and limits operation to 85˚C. The ADuM3190 and ADuM4190 include a highly accurate 1.225-V reference and a wideband operational amplifier that can be used to set up a variety of commonly used power supply loop compensation techniques.

ADuM3190/4190 Isolated Error Amplifiers Key Features:

•Bandwidth: 400 kHz
•0.5% initial accuracy at 25°C
•1% total accuracy over –40˚C to +125˚C
•Low power operation: <7 mA
•Isolation voltage:
oADuM3190: 2.5 kV rms
oADuM4190: 5 kV rms (reinforced)

Pricing and Availability: