Datasheet Linear Technology LT1683 — 数据表

制造商	Linear Technology
系列	LT1683

摆率控制超低噪声推挽DC / DC控制器

数据表

预览并下载

PDF, 419 Kb, 语言: en, 文件上传: Sep 3, 2017, 页数: 26
Slew Rate Controlled Ultralow Noise Push-Pull DC/DC Controller

从文件中提取

价格

打包

	LT1683EG#PBF	LT1683EG#TRPBF	LT1683IG#PBF	LT1683IG#TRPBF
N	1	2	3	4
Package	SSOP-20 包装外形图	SSOP-20 包装外形图	SSOP-20 包装外形图	SSOP-20 包装外形图
Package Code	G	G	G	G
Package Index	05-08-1640 (G20)	05-08-1640 (G20)	05-08-1640 (G20)	05-08-1640 (G20)
Pin Count	20	20	20	20

参数化

Parameters / Models	LT1683EG#PBF	LT1683EG#TRPBF	LT1683IG#PBF	LT1683IG#TRPBF
Demo Boards	DC477A	DC477A	DC477A	DC477A
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no	no
Features	Low EMI, Adjustable Slew Rate	Low EMI, Adjustable Slew Rate	Low EMI, Adjustable Slew Rate	Low EMI, Adjustable Slew Rate
Frequency, kHz	250	250	250	250
Integrated Inductor	no	no	no	no
Isupply, mA	25	25	25	25
Monolithic	no	no	no	no
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	5	5	5	5
Synchronous	no	no	no	no
Topology	Push-Pull, Inverting, Boost, Flyback	Push-Pull, Inverting, Boost, Flyback	Push-Pull, Inverting, Boost, Flyback	Push-Pull, Inverting, Boost, Flyback
Vin Max, V	20	20	20	20
Vin Min, V	4	4	4	4
Vout Max, V	100	100	100	100
Vout Min, V	5	5	5	5
Vswitch Max, V	100	100	100	100

生态计划

	LT1683EG#PBF	LT1683EG#TRPBF	LT1683IG#PBF	LT1683IG#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

应用须知

下载
Current Sources for Fiber Optic Lasers: A Compendium of Pleasant Current Events &mdash AN90
PDF, 409 Kb, 档案已发布: Apr 1, 2002
A large group of fiber optic lasers are powered by DC current. Laser drive is supplied by a current source with modulation added to the signal. The current source, although conceptually simple, constitutes an extraordinarily tricky design problem. There are a number of practical requirements for a fiber optic current source and failure to consider them can cause laser and/or optical component destruction. This application note describes ten laser current source circuits with a range of capabilities. High and low current types are presented, along with designs for grounded anode, cathode or floating operation. Each circuit also includes laser protection features. Appended sections cover laser load simulation and current source noise measurement techniques.
从文件中提取
Application Note 90
April 2002
Current Sources for Fiber Optic Lasers
A Compendium of Pleasant Current Events
Jim Williams, Linear Technology Corporation
INTRODUCTION
A large group of fiber optic lasers are powered by DC
current. Laser drive is supplied by a current source with
modulation added further along the signal path. The
current source, although conceptually simple, constitutes
an extraordinarily tricky design problem. There are a
number of practical requirements for a fiber optic current
source and failure to consider them can cause laser and/
or optical component destruction. Protection features must be included to prevent laser and
optical component damage. The laser, an expensive and
delicate device, must be protected under all conditions,
including supply ramp up and down, improper control
input commands, open or intermittent load connections
and вЂњhot plugging.вЂќ
Detailed Discussion of Performance Issues Design Criteria for Fiber Optic Laser Current Sources It is useful to expand on the above cursory discussion to
clarify design goals. As such, each previously called out
issue is treated in greater detail below. Figure 1 shows a conceptual laser current source. Inputs
include a current output programming port, an output …

文章

下载
Reduce EMI with Ultralow Noise 48V to 5V, 10W DC/DC Converter &mdash LT Journal
PDF, 209 Kb, 档案已发布: Feb 1, 2001
从文件中提取
DESIGN IDEAS Reduce EMI with Ultralow Noise 48V
to 5V, 10W DC/DC Converter
by Rick Brewster
Introduction
Increasingly, designers are using
ultralow noise controllers to avoid
EMI problems. Lower operating
voltages and more sensitive measurements have created the need for
quieter supplies. Extra filtering components and shielding are usually
required, as is a careful board layout.
Ultralow noise switching regulator
controllers such as the LT1683 reduce
or eliminate the need for extra filtering. The LT1683 controller uses
external MOSFETs to create ultralow
noise DC/DC converters. Control of
the switch voltage and switch current
slew rates reduces switcher noise.
The LT1683вЂ™s use of external switches
allows for greater flexibility in the
selection of voltage and current ratings of the supply. + 39ВµF
63V 2Вµs/DIV Figure 2. Voltage on one of the MOSFET drains and on the sense resistor Circuit Details T1 FZT649
10ВµF
20V …
下载
Two New Switching Regulators Deliver Both Power and Ultralow Noise &mdash LT Journal
PDF, 219 Kb, 档案已发布: Sep 1, 2001
从文件中提取
DESIGN FEATURES Two New Switching Regulators Deliver
Both Power and Ultralow Noise
by Rick Brewster
Introduction
T raditionally, when designers
required a very low noise power supply, they would avoid DC/DC
switchers because of their notorious
reputation for generating high frequency harmonics. If they did use a
switcher, careful attention would be
required for board layout, shielding
and the judicious use of filtering elements. The LT1683 and LT1738 are
new switching regulator controllers
that create a DC/DC switching supply with significantly lower conducted
and radiated electromagnetic interference (EMI). These controllers
reduce EMI at its source by controlling the current and voltage slew rates
of the main switches. A robust DC/
DC converter for use in noise-sensitive applications can be built with
confidence.
The LT1683 and LT1738 make use
of a patented dual control loop method
that allows for control of both the
output switch voltage slew rate and 48V
510в„¦ …

模型线

系列: LT1683 (4)

LT1683EG#PBF LT1683EG#TRPBF LT1683IG#PBF LT1683IG#TRPBF

制造商分类

Power Management > Switching Regulator > Ultralow Noise Regulators