LINEAR LT3511 Monolithic High Voltage Isolated Flyback Converter User's Manual
Summary
The LT3511 is a high-voltage monolithic switching regulator designed for isolated flyback power conversion, capable of handling inputs from 4.5V to 100V and delivering up to 2.5W of isolated output power. This manual details the product's features, functional specifications, and typical applications, including telecom supplies and industrial power. Ideal for engineers designing compact, highly regulated isolated DC-DC power solutions who require advanced integration like boundary mode operation without external optocouplers or third windings.
Page 1 Text Content
LT3511
查询LT3511供应商
Monolithic High Voltage Isolated Flyback Converter
FEATURES DESCRIPTION n 4.5V to 100V Input Voltage Range
The LT3511 is a high voltage monolithic switching regula-
n Internal 240m A, 150V Power Switch
tor specifically designed for the isolated flyback topology.
n Boundary Mode Operation
No third winding or opto-isolator is required for regula-
n No Transformer Third Winding or
tion as the part senses output voltage directly from the
Opto-Isolator Required for Regulation primary-side flyback waveform. The device integrates a n Improved Primary-Side Winding Feedback
240m A, 150V power switch, high voltage circuitry, and
Load Regulation control into a high voltage 16-lead MSOP package with n VOUT Set with Two External Resistors
four leads removed.
n BIAS Pin for Internal Bias Supply and Power
The LT3511 operates from an input voltage range of 4.5V
Switch Driver
to 100V and delivers up to 2.5W of isolated output power.
n No External Start-Up Resistor
Two external resistors and the transformer turns ratio
n 16-Lead MSOP Package
easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of APPLICATIONS integration and the use of boundary mode operation results in a simple, clean, tightly regulated application solution to
n Isolated Telecom Power Supplies
UT (V the traditionally tough problem of isolated power delivery.
n Isolated Auxiliary/Housekeeping Power Supplies
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
n Isolated Industrial, Automotive and Medical Power
and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522.
Supplies
TYPICAL APPLICATION
48V to 5V Isolated Flyback Converter Output Load and Line Regulation
VIN 5.25
36V TO 72V 4:1
VIN 0.3A
EN/UVLO 19µH300µH 5.15
169k VOUT
LT3511 VIN = 48V
RFB VIN = 36V
4.95 VIN = 72V
TC SW
VC GND BIAS
3511 TA01a
LOAD CURRENT (m A)
3511 TA01b
Page Summary Contents For LINEAR LT3511 Monolithic High Voltage Isolated Flyback Converter User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 1.77 MB |
| Published | May 25, 2026 |
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Frequently Asked Questions
What is the input voltage range for the LT3511 converter?
The device operates from an input voltage range of 4.5V to 100V.
Does the LT3511 require external isolation components?
No, boundary mode operation allows it to sense output voltage directly, eliminating the need for a third winding or opto-isolator.
What type of applications is the LT3511 suitable for?
It is ideal for isolated telecom power supplies, auxiliary/housekeeping power, and industrial/automotive power delivery.
Where can the LT3511 be mounted for high reliability?
The device comes in a 16-Lead MSOP package with integrated components to simplify assembly.