LT1074

更新时间： 2024-11-23 22:55:47

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
16页	218K
描述
Step-Down Switching Regulator

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中文翻译

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LT1074 数据手册

LT1074/LT1076

Step-Down Switching

Regulator

positive “buck” configuration but several design innova-

tions allow this device to be used as a positive-to-negative

converter, a negative boost converter, and as a flyback

converter. The switch output is specified to swing 40V

below ground, allowing the LT1074 to drive a tapped-

inductor in the buck mode with output currents up to 10A.

FEATURES

■

5A Onboard Switch (LT1074)

■

100kHz Switching Frequency

■

Greatly Improved Dynamic Behavior

■

Available in Low Cost 5 and 7-Lead Packages

■

Only 8.5mA Quiescent Current

The LT1074 uses a true analog multiplier in the feedback

loop. This makes the device respond nearly instanta-

neously to input voltage fluctuations and makes loop gain

independent of input voltage. As a result, dynamic behav-

ior of the regulator is significantly improved over previous

designs.

■

Programmable Current Limit

■

Operates Up to 60V Input

■

Micropower Shutdown Mode

APPLICATIO S

On-chip pulse by pulse current limiting makes the LT1074

nearlybust-proofforoutputoverloadsorshorts.Theinput

voltage range as a buck converter is 8V to 60V, but a self-

boot feature allows input voltages as low as 5V in the

inverting and boost configurations.

■

Buck Converter with Output Voltage Range of 2.5V

to 50V

■

Tapped-Inductor Buck Converter with 10A Output

at 5V

■

Positive-to-Negative Converter

■

Negative Boost Converter

The LT1074 is available in low cost TO-220 or TO-3

packages with frequency pre-set at 100kHz and current

limit at 6.5A (LT1076 = 2.6A). A 7-pin TO-220 package is

also available which allows current limit to be adjusted

down to zero. In addition, full micropower shutdown can

be programmed. See Application Note 44 for design

details.

■

Multiple Output Buck Converter

DESCRIPTIO

The LT^®1074 is a 5A (LT1076 is rated at 2A) monolithic

bipolar switching regulator which requires only a few

external parts for normal operation. The power switch, all

oscillator and control circuitry, and all current limit com-

ponents,areincludedonthechip.Thetopologyisaclassic

A fixed 5V output, 2A version is also available. See LT1076-5.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

Buck Converter Efficiency

Basic Positive Buck Converter

LT1074

L1**

50µH (LT1074)

100

100µH (LT1076)

= 12V, V = 20V

OUT

* USE MBR340 FOR LT1076

** COILTRONICS #50-2-52 (LT1074)

#100-1-52 (LT1076)

PULSE ENGINEERING, INC.

#PE-92114 (LT1074)

10V TO 40V

2.8k

LT1074

MBR745*

= 5V, V = 15V

OUT

GND

#PE-92102 (LT1076)

HURRICANE #HL-AK147QQ (LT1074)

2.21k

2.7k

L = 50µH TYPE 52 CORE

DIODE = MBR735

#HL-AG210LL (LT1076)

C3^†

200µF

0.01µF

500µF

25V

†

RIPPLE CURRENT RATING ≥ I /2

OUT

LT1074•TA01

OUTPUT LOAD CURRENT (A)

LT1074•TPC27

12 3 4 5 6 7...16

中文翻译

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与LT1074相关器件

型号	品牌	获取价格	描述	数据表
LT1074_15	Linear	获取价格	Step-Down Switching Regulator
LT1074C/D	ETC	获取价格	Current-Mode SMPS Controller
LT1074CK	Linear	获取价格	Step-Down Switching Regulator
LT1074CT	Linear	获取价格	Step-Down Switching Regulator
LT1074CT#PBF	Linear	获取价格	LT1074 - Step-Down Switching Regulator; Package: TO-220; Pins: 5; Temperature Range: 0&
LT1074CT7	Linear	获取价格	Step-Down Switching Regulator
LT1074CT7#PBF	Linear	获取价格	LT1074 - Step-Down Switching Regulator; Package: TO-220; Pins: 7; Temperature Range: 0&
LT1074CV	ETC	获取价格	Current-Mode SMPS Controller
LT1074CY	ETC	获取价格	Current-Mode SMPS Controller
LT1074EK	ETC	获取价格	Current-Mode SMPS Controller

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