100V Isolated Monolithic Flyback Regulator Needs No Optocoupler

News Release ⎜ www.linear.com
100V Isolated Monolithic Flyback Regulator
Needs No Optocoupler
MILPITAS, CA – December 6, 2010 – Linear Technology Corporation announces the LT3511, a
high voltage isolated monolithic flyback switching regulator that significantly simplifies the
design of an isolated DC/DC converter. No optocoupler, third winding or signal transformer are
required for feedback since the output voltage is sensed from the primary-side flyback signal.
The LT3511 operates over a 4.5V to 100V input voltage range, has a 240mA, 150V power
switch and delivers up to 2.5 Watts of output power, making it well suited for a wide variety of
telecom, datacom, automotive, industrial and medical applications.
The LT3511 operates in a boundary mode, a current-mode control switching scheme,
resulting in +/-5% typical regulation over the full line, load and temperature range. Boundary
mode, also known as critical conduction mode or CCM, 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 transformers identified in the data
sheet can be used for numerous applications. The high level of integration results in a simple,
clean, tightly regulated application solution to the traditional challenge of isolated power
Additional features include an onboard low dropout regulator for IC power, undervoltage
lockout and output voltage temperature compensation.
The LT3511 is available in a small MSOP-16 package with 4 pins removed for additional
high voltage pin spacing. In addition to the extended and industrial versions that operate over a
junction temperature range from -40°C to 125°C, a high temperature automotive grade is
available that operates from -40°C to 150°C. Pricing starts at $2.95 each in 1000-piece
quantities. For more information, visit www.linear.com/3511.
100V Isolated Monolithic Flyback Regulator
Needs No Optocoupler
page 2
Photo Caption: 100V Isolated Monolithic Flyback Regulator
Summary of Features: LT3511
VIN Range from 4.5V to 100V
Onboard 240mA, 150V Integrated Power Switch
No Optocoupler, Transformer or Third Winding Required for Feedback
Current-Mode Control
Boundary-Mode Operation
VOUT Set with Two External Resistors
Off-the-Shelf Transformers
Programmable Under Voltage Lockout
Output Voltage Temperature Compensation
About Linear Technology
Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing
and marketing a broad line of high performance analog integrated circuits for major companies
worldwide for three decades. The Company’s products provide an essential bridge between our
analog world and the digital electronics in communications, networking, industrial, automotive,
computer, medical, instrumentation, consumer, and military and aerospace systems. Linear
Technology produces power management, data conversion, signal conditioning, RF and interface
ICs, and µModule® subsystems.
LT, LTC, LTM, µModule and
are registered trademarks of Linear Technology Corp. All other trademarks are the
property of their respective owners.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
Tel 408-432-1900 ext 2419
Alan Timmins
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
408-432-1900 ext 2233