Datasheet Linear Technology LT3439 — 数据表

制造商	Linear Technology
系列	LT3439

摆率受控的超低噪声 1A 隔离式 DC/DC 变压器驱动器

数据表

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PDF, 196 Kb, 语言: en, 文件上传: Sep 18, 2017, 页数: 12
Slew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver

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价格

打包

	LT3439EFE#PBF	LT3439EFE#TRPBF
N	1	2
Package	TSSOP-16 包装外形图	TSSOP-16 包装外形图
Package Code	FE	FE
Package Index	05-08-1663 (BA)	05-08-1663 (BA)
Pin Count	16	16

参数化

Parameters / Models	LT3439EFE#PBF	LT3439EFE#TRPBF
Demo Boards	DC511A	DC511A
Design Tools	LTspice File	LTspice File
Export Control	no	no
Features	Low EMI, Adjustable Slew Rate, Resistor Set Frequency, External Synchronization	Low EMI, Adjustable Slew Rate, Resistor Set Frequency, External Synchronization
Frequency, kHz	250	250
Frequency Adjust Range	20kHz - 250kHz	20kHz - 250kHz
Frequency Sync Range	20kHz - 300kHz	20kHz - 300kHz
Integrated Inductor	no	no
Ishutdown, µA	5	5
Isupply, mA	12	12
Monolithic	yes	yes
Number of Outputs	1	1
Operating Temperature Range, °C	0 to 85	0 to 85
Polyphase	no	no
Switch Current, A	1	1
Synchronous	no	no
Topology	Push-Pull	Push-Pull
Vin Max, V	20	20
Vin Min, V	2.8	2.8
Vout Min, V	2.8	2.8

生态计划

	LT3439EFE#PBF	LT3439EFE#TRPBF
RoHS	Compliant	Compliant

应用须知

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High Voltage, Low Noise, DC/DC Converters &mdash AN118
PDF, 2.6 Mb, 档案已发布: Mar 28, 2008
Photomultipliers (PMT), avalanche photodiodes (APD), ultrasonic transducers, capacitance microphones, radiation detectors and similar devices require high voltage, low current bias. Additionally, the high voltage must be pristinely free of noise; well under a millivolt is a common requirement with a few hundred microvolts sometimes necessary. Normally, switching regulator conп¬Ѓgurations cannot achieve this performance level without employing special techniques. One aid to achieving low noise is that load currents rarely exceed 5mA. This freedom permits output п¬Ѓltering methods that are usually impractical.
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Application Note 118
March 2008
High Voltage, Low Noise, DC/DC Converters
A Kilovolt with 100 Microvolts of Noise
Jim Williams This publication describes a variety of circuits featuring
outputs from 200V to 1000V with output noise below 100ВµV
measured in a 100MHz bandwidth. Special techniques
enable this performance, most notably power stages
optimized to minimize high frequency harmonic content.
Although sophisticated, all examples presented utilize
standard, commercially available magneticsвЂ”no custom
components are required. This provision is intended to
assist the user in quickly arriving at a produceable design.
Circuits and their descriptions are presented beginning
with the next ink.
BEFORE PROCEEDING ANY FURTHER, THE READER
IS WARNED THAT CAUTION MUST BE USED IN THE
CONSTRUCTION, TESTING AND USE OF THE TEXTвЂ™S
CIRCUITS. HIGH VOLTAGE, LETHAL POTENTIALS ARE
PRESENT IN THESE CIRCUITS. EXTREME CAUTION
MUST BE USED IN WORKING WITH, AND MAKING
CONNECTIONS TO, THESE CIRCUITS. REPEAT: THESE
CIRCUITS CONTAIN DANGEROUS, HIGH VOLTAGE …

设计须知

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Ultralow Noise Switching Power Supplies Simplify EMI Compliance &mdash DN316
PDF, 94 Kb, 档案已发布: Jul 2, 2003
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advertisement Ultralow Noise Switching Power Supplies Simplify
EMI Compliance вЂ“ Design Note 316
David Canny
Introduction
Most electronic products must pass electromagnetic
interference (EMI) compliance testsвЂ”such as the FCC
Part 15 rules in the USвЂ”before they can be released
into the market. When a companyвЂ™s product fails EMI
compliance tests, the company loses control of the
development process, shipping dates begin to slip,
projected revenues diminish and expenses start piling
up. Furthermore, excessive noise can interfere with
sensitive electronics within the product itself. So it is
essential that electronic products are designed from
the beginning with EMI attenuation in mind. Often the
EMI compliance problem lies in the productвЂ™s switching power supply. In these cases, the best solution is
prevention by using an ultralow noise switching power
supply in the initial design, rather than adding shields
and п¬Ѓlters to the product after the fact. Circuit Description
Figure 1 shows the LTВ®3439, one of several low noise
switchers available from Linear Technology. Ultralow
noise and low EMI are achieved by controlling both
the output switch voltage and current slew rates. This …

文章

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A Simple Solution to Low Noise, Isolated Power Conversion &mdash LT Journal
PDF, 181 Kb, 档案已发布: Nov 1, 2002
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DESIGN IDEAS A Simple Solution to Low Noise,
Isolated Power Conversion by Tom Sheehan
Introduction
the turns ratio. Rectifiers on the secondary side generate the DC output
voltage. The output capacitor is for
hold up and filtering. If required, an
additional inductor and capacitor can
be added to reduce the output noise
even further.
Control of the voltage and current
slew rate is maintained via two control loops. One loop controls the
output switch dV/dt and the other
loop controls the output switch dI/dt.
Output slew control is achieved by
comparing the two currents generated by these slewing events to a
current set by the external resistor
RSL.
The frequency of the internal oscillator can be set from 20kHz to 250kHz
with an external resistor and capacitor, RT and CT. Each output switch is
driven at half the frequency of the
oscillator. The SYNC pin can be used
to synchronize the switching to an
external clock. A SHDN pin can be …

模型线

系列: LT3439 (2)

LT3439EFE#PBF LT3439EFE#TRPBF

制造商分类

Power Management > Switching Regulator > Ultralow Noise Regulators | Flyback, Forward and Isolated Controllers