Datasheet Linear Technology LT3574

Manufacturer	Linear Technology
Series	LT3574

Isolated Flyback Converter Without an Opto-Coupler

Datasheets

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PDF, 296 Kb, Language: en, File uploaded: Jul 31, 2016, Pages: 24
Isolated Flyback Converter Without an Opto-Coupler

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Packaging

	LT3574EMS#PBF	LT3574EMS#TRPBF	LT3574IMS#PBF	LT3574IMS#TRPBF
N	1	2	3	4
Package	MS-16 Package Outline Drawing	MS-16 Package Outline Drawing	MS-16 Package Outline Drawing	MS-16 Package Outline Drawing
Package Code	MS	MS	MS	MS
Package Index	05-08-1669	05-08-1669	05-08-1669	05-08-1669
Pin Count	16	16	16	16

Parametrics

Parameters / Models	LT3574EMS#PBF	LT3574EMS#TRPBF	LT3574IMS#PBF	LT3574IMS#TRPBF
Demo Boards	DC1636A	DC1636A	DC1636A	DC1636A
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no
Features	Boundary Mode Operation, No Opto Isolator	Boundary Mode Operation, No Opto Isolator	Boundary Mode Operation, No Opto Isolator	Boundary Mode Operation, No Opto Isolator
Frequency, kHz	1000	1000	1000	1000
Integrated Inductor	no	no	no	no
Isupply, mA	3.5	3.5	3.5	3.5
Monolithic	yes	yes	yes	yes
Number of Outputs	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Polyphase	no	no	no	no
Switch Current, A	0.9	0.9	0.9	0.9
Synchronous	no	no	no	no
Topology	Flyback	Flyback	Flyback	Flyback
Vin Max, V	40	40	40	40
Vin Min, V	3	3	3	3

Eco Plan

	LT3574EMS#PBF	LT3574EMS#TRPBF	LT3574IMS#PBF	LT3574IMS#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V &mdash DN509
PDF, 723 Kb, File published: Oct 24, 2012
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Micropower Isolated Flyback Converter with Input Voltage
Range from 6V to 100V
Design Note 509
Zhongming Ye
Introduction
Flyback converters are widely used in isolated DC/DC
applications because of their relative simplicity and
low cost compared to alternative isolated topologies. Even so, designing a traditional flyback is not
easyвЂ”the transformer requires careful design, and
loop compensation is complicated by the well known
right-half plane (RHP) zero and the propagation delay
of the opto-coupler.
Linear TechnologyвЂ™s no-opto flyback converters, such
as the LT В® 3573, LT3574, LT3575, LT3511 and LT3512,
simplify the design of flyback converters by incorporating a primary-side sensing scheme and running the
converter in boundary mode. The LT8300 high voltage
monolithic isolated flyback converter further simplifies
flyback design by integrating a 260mA, 150V DMOS
power switch, an internal compensation network and a
soft-start capacitor. The LT8300 operates with input supply voltages from 6V to 100V and delivers output power
of up to 2W with as few as five external components.
The LT8300 operates in boundary mode and offers low
ripple Burst ModeВ® operation, enabling the design of …
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Monolithic No-Opto Isolated Flyback Converter Provides Versatile Solution &mdash DN525
PDF, 259 Kb, File published: Feb 10, 2014
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Monolithic No-Opto Isolated Flyback Converter Provides
Versatile Solution
Design Note 525
George Qian
Introduction
Traditionally, isolated power supplies use an optocoupler in the feedback loop to transfer regulation
information across the isolation barrier. Unfortunately,
an opto-couplerвЂ™s gain characteristic varies widely over
temperature and lifetime, increasing the difficulty of
power supply loop compensation.
Linear TechnologyвЂ™s line of no-opto flyback converters,
such as the LTВ®3573, LT3574, LT3575, LT3511, LT3512
and LT8300, simplify flyback design by incorporating
a primary-side sensing scheme, thereby eliminating
the need for an opto-isolator.
The LT8302 monolithic no-opto flyback converter
has an integrated 65V/3.6A DMOS power switch with
internal loop compensation and soft-start. The LT8302
can operate from an input voltage as low as 2.8V to
42V, and deliver output power up to 18W. It offers
low ripple Burst Mode В® operation at light loads, providing low standby power loss, and features a low
component count.
Performance and Ease of Use …

Model Line

Series: LT3574 (4)

LT3574EMS#PBF LT3574EMS#TRPBF LT3574IMS#PBF LT3574IMS#TRPBF

Manufacturer's Classification

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