Datasheet Linear Technology LT3825

Manufacturer	Linear Technology
Series	LT3825

Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range

Datasheets

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PDF, 390 Kb, Language: en, File uploaded: Sep 19, 2017, Pages: 32
Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range

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Packaging

	LT3825EFE#PBF	LT3825EFE#TRPBF
N	1	2
Package	TSSOP-16 Package Outline Drawing	TSSOP-16 Package Outline Drawing
Package Code	FE	FE
Package Index	05-08-1663 (BC)	05-08-1663 (BC)
Pin Count	16	16

Parametrics

Parameters / Models	LT3825EFE#PBF	LT3825EFE#TRPBF
Demo Boards	DC1143A,DC950A-A,DC894A-A,DC894B-C,DC894C-B,DC894C-C	DC1143A,DC950A-A,DC894A-A,DC894B-C,DC894C-B,DC894C-C
Design Tools	LTspice File	LTspice File
Export Control	no	no
Features	No Opto Isolator, Resistor Set Frequency, External Synchronization	No Opto Isolator, Resistor Set Frequency, External Synchronization
Frequency, kHz	250	250
Frequency Adjust Range	50kHz - 250kHz	50kHz - 250kHz
Frequency Sync Range	50kHz - 250kHz	50kHz - 250kHz
Integrated Inductor	no	no
Ishutdown, µA	50	50
Isupply, mA	1	1
Monolithic	no	no
Number of Outputs	1	1
Operating Temperature Range, °C	0 to 85	0 to 85
Polyphase	no	no
Switch Current, A	12	12
Synchronous	yes	yes
Topology	Flyback	Flyback
Vin Max, V	75	75
Vin Min, V	14	14
Vout Maximum	3, 5, 12 and higher	3, 5, 12 and higher

Eco Plan

	LT3825EFE#PBF	LT3825EFE#TRPBF
RoHS	Compliant	Compliant

Design Notes

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Simple High Efficiency Isolated Flyback Supply Without Optoisolator &mdash DN1011
PDF, 107 Kb, File published: Dec 16, 2005
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advertisement Simple High Efficiency Isolated Flyback Supply Without
Optoisolator вЂ“ Design Note 1011
Ryan Huff
Introduction
While simplicity and high efп¬Ѓciency (for cool running) are
no longer optional features in isolated power supplies, it
is traditionally difп¬Ѓcult to achieve both. Achieving high
efп¬Ѓciency often requires the use of advanced topologies
and home-brewed secondary synchronous rectiп¬Ѓcation
schemes once reserved only for higher power applications. This only adds to the parts count and to the design
complexity associated with the reference and optocoupler
circuits typically used to maintain isolation. Fortunately, a
breakthrough IC makes it possible to achieve both high efп¬Ѓciency and simplicity in a synchronous п¬‚yback topology.
The LTВ® 3825 simpliп¬Ѓes and improves the performance of
low voltage, high current п¬‚yback supplies by providing
precise synchronous rectiп¬Ѓer timing and eliminating the
need for optocoupler feedback while maintaining excellent
regulation and superior loop response. current of 12A compares favorably to that of a higher
parts count forward converter design. This is primarily
the result of a simple, well-controlled implementation of
synchronous rectiп¬Ѓcation. Furthermore, due to its high
efп¬Ѓciency operation, the greatest temperature rise of any
component is only 60В°C above the ambient temperature …

Articles

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Simple, High Efficiency, Multi-Output, Isolated Flyback Supply with Excellent Regulation &mdash LT Journal
PDF, 96 Kb, File published: Nov 22, 2006
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LвЂ‰DESIGN IDEAS Simple, High Efficiency, Multi-Output,
Isolated Flyback Supply with
by Ryan Huff
Excellent Regulation
Introduction accomplished with inefficient, linear
post regulators or efficient (but relatively expensive) switch-mode buck
regulator ICs. All of these solutions
fail the simplicity test in parts count
and design complexity.
Fortunately, a breakthrough IC
makes it possible to achieve high
efficiency and tight regulation while
maintaining the simplicity typically Simplicity, tight regulation, and high
efficiency are no longer optional features in isolated power supplies, but
achieving all three is traditionally
difficult. High efficiency often requires
the use of advanced topologies and
home-brewed secondary synchronous
rectification schemes. Tight regulation
for a multi-output supply is often L1-L2 DO1813P-331HC (COILCRAFT)
L3: DO1813P-561HC (COILCRAFT)
Q5: FMMT618 (ZETEX)
Q6: FMMT718 (ZETEX) …

Model Line

Series: LT3825 (2)

LT3825EFE#PBF LT3825EFE#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers