Isolated flyback DC/DC controller eliminates optocoupler
August 06, 2010 // Phil Ling
Requires no opto-isolator, third winding or signal transformer
Linear Technology has introduded the LT3748, a high input voltage isolated flyback DC/DC controller that significantly simplifies the design of an isolated DC/DC converter. No opto-isolator, third winding or signal transformer is required for feedback since the output voltage is sensed from the primary-side flyback signal. The LT3748 operates over a 5V to 100V input voltage range and drives an external N-channel power MOSFET, making it suitable for a variety of industrial, medical, telecom, datacom and automotive applications.
The LT3748 operates in boundary mode, which is a variable frequency current mode control switching scheme, resulting in +/-5% typical regulation over the full line, load and temperature range. Boundary mode also permits the use of a smaller transformer compared to equivalent continuous conduction mode designs. The output voltage is easily set by two external resistors and the transformer turns ratio. Several off-the-shelf transformers identified in the data sheet can be used for numerous applications. The high level of integration and the use of boundary mode operation results in a simple, clean application solution to the traditionally tough problem of isolated power delivery.
Additional features include an onboard low dropout regulator for IC power, programmable soft start, undervoltage lockout, adjustable current limit and output voltage temperature compensation. The LT3748 is available in a small MSOP-16 package with 4 pins removed for additional high voltage pin spacing. This device is available in extended and industrial operating junction temperature range at -40°C to 125°C.
For more information, visit www.linear.com/3748.
Essess completes Street View with IR heat maps
January 23, 2015
Back in 2011, Professor Sanjay Sarma from the Mechanical Engineering Department at MIT and Co-Founder of US startup Essess, ...
Technology available, application wanted
Open source to flood IT in 2015
Asia leads automotive innovation
Samsung, Apple dominated chip buying in 2014
French startup expands 3D to the room
January 22, 2015
With still 26 days to go, Kickstarter project Immersis from French startup Catopsys has almost reached its funding goal of ...
Fraunhofer develops MEMS optical grating for medium infrared
ARM strengthens position in safety-critical applications
Antireflective nanotextures create self-assembly surface for solar cells
- Sensing Elements for Current Measurements
- Investigating Die attach Failure in IGBTs using Power Cycling Tests
- Power Semiconductor Failure Diagnosis using Thermal Characterization and Power Cycling
- Top 5 Trends in Product Development and Test Engineering
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.