Isolated Error Amplifiers Outperform Optocouplers and Shunt Regulators in Power Supply Applications
26 Februar 2013 - 8:00AM
Business Wire
Analog Devices, Inc. (NASDAQ: ADI), a global leader in
high-performance semiconductors for signal-processing applications
and a pioneer in digital isolator technology, today introduced
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 of –40˚C to +125˚C.
This provides manufacturers of ac-to-dc and dc-to-dc power
supplies, including those that are DOSA (Distributed-power Open
Standards Alliance)-compliant, with a significant upgrade in speed
and operating temperature range, as well as a 5× improvement in
transient response.
- View product pages, download data
sheets and order samples: http://www.analog.com/ADuM3190 and
http://www.analog.com/ADuM4190
- View discussions and FAQs on Analog
Devices’ interface and isolation products on EngineerZone™, an
online technical support community:
http://ez.analog.com/community/interface-isolation
Designed with ADI’s iCoupler® digital isolation technology, the
ADuM3190 and ADuM4190 eliminate the CTR (current-transfer ratio) 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:
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