LT1738

更新时间： 2024-11-19 22:51:47

品牌	Logo	应用领域
凌特 - Linear		控制器
页数	文件大小	规格书
20页	249K
描述
Slew Rate Controlled Ultralow Noise DC/DC Controller

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LT1738 数据手册

LT1738

Slew Rate Controlled

Ultralow Noise DC/DC Controller

DESCRIPTIO

FEATURES

The LT^®1738 is a switching regulator controller designed

to lower conducted and radiated electromagnetic interfer-

ence (EMI). Ultralow noise and EMI are achieved by

controlling the voltage and current slew rates of an exter-

nal N-channel MOSFET switch. Current and voltage slew

rates can be independently set to optimize harmonic

content of the switching waveforms vs efficiency. The

LT1738 can reduce high frequency harmonic power by as

much as 40dB with only minor losses in efficiency.

■

Greatly Reduced Conducted and Radiated EMI

■

Low Switching Harmonic Content

Independent Control of Output Switch Voltage and

Current Slew Rates

■

Greatly Reduced Need for External Filters

Single N-Channel MOSFET Driver

20kHz to 250kHz Oscillator Frequency

Easily Synchronized to External Clock

Regulates Positive and Negative Voltages

Easier Layout Than with Conventional Switchers

The LT1738 utilizes a current mode architecture opti-

mized for single switch topologies such as boost, flyback

and Cuk. The IC includes gate drive and all necessary

oscillator, control and protection circuitry. Unique error

amp circuitry can regulate both positive and negative

voltages. The internal oscillator may be synchronized to

an external clock for more accurate placement of switch-

ing harmonics.

APPLICATIO S

■

Power Supplies for Noise Sensitive Communication

Equipment

■

EMI Compliant Offline Power Supplies

■

Precision Instrumentation Systems

■

Isolated Supplies for Industrial Automation

Protection features include gate drive lockout for low V_IN,

soft-start, output current limit, short-circuit current limit-

ing, gate drive overvoltage clamp and input supply

undervoltage lockout.

■

Medical Instruments

Data Acquisition Systems

■

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

TYPICAL APPLICATIO

Ultralow Noise 5V to 12V Converter

12V Output Noise

(Bandwidth = 100MHz)

MBRD620

22µH

10µH

12V

150µF

OSCON

4 × 150µF

OSCON

OPTIONAL

100µF

GCL

5pF

POINT

400µV

P-P

SHDN

CAP

ON SCHEMATIC

500µV/DIV

SYNC

1.3nF

Si9426

GATE

POINT

LT1738

16.9k

ON SCHEMATIC

50mV/DIV

25k 3.3k

VSL

CSL

25mΩ

25k 3.3k

22nF

PGND

21.5k

2.5k

1738 TA01a

5µs/DIV

0.22µF

SS GND NFB

1.5k

13 11 10

1738 TA01

10nF

1738fa

12 3 4 5 6 7...20

中文翻译

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与LT1738相关器件

型号	品牌	获取价格	描述	数据表
LT1738EG	Linear	获取价格	Slew Rate Controlled Ultralow Noise DC/DC Controller
LT1738EG#PBF	Linear	获取价格	暂无描述
LT1738EG#TR	Linear	获取价格	LT1738 - Slew Rate Controlled Ultralow Noise DC/DC Controller; Package: SSOP; Pins: 20; Te
LT1738EG#TRPBF	Linear	获取价格	LT1738 - Slew Rate Controlled Ultralow Noise DC/DC Controller; Package: SSOP; Pins: 20; Te
LT1738IG	Linear	获取价格	Slew Rate Controlled Ultralow Noise DC/DC Controller
LT1738IG#PBF	Linear	获取价格	LT1738 - Slew Rate Controlled Ultralow Noise DC/DC Controller; Package: SSOP; Pins: 20; Te
LT1738IG#TR	Linear	获取价格	LT1738 - Slew Rate Controlled Ultralow Noise DC/DC Controller; Package: SSOP; Pins: 20; Te
LT1738IG#TRPBF	Linear	获取价格	LT1738 - Slew Rate Controlled Ultralow Noise DC/DC Controller; Package: SSOP; Pins: 20; Te
LT1739	Linear	获取价格	Dual 500mA, 200MHz xDSL Line Driver Amplifier
LT1739	ADI	获取价格	双通道 500mA、200MHz xDSL 线路驱动器放大器

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