Datasheet > LT1244

LT1244

更新时间： 2024-11-22 21:55:07

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
16页	334K
描述
High Speed Current Mode Pulse Width Modulators

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LT1244 数据手册

LT1241 Series

High Speed Current Mode

Pulse Width Modulators

DESCRIPTIO

EATURE

Low Start-Up Current: < 250µA

50ns Current Sense Delay

Current Mode Operation: To 500kHz

Pin Compatible with UC1842 Series

Undervoltage Lockout with Hysteresis

No Cross-Conduction Current

The LT^®1241 series devices are 8-pin, fixed frequency,

currentmode,pulsewidthmodulators.Theyareimproved

plugcompatibleversionsoftheindustrystandardUC1842

series. These devices have both improved speed and

lower quiescent current. The LT1241 series is optimized

for off-line and DC/DC converter applications. They con-

tain a temperature-compensated reference, high gain er-

ror amplifier, current sensing comparator and a high

current totem pole output stage ideally suited to driving

power MOSFETs. Start-up current has been reduced to

less than 250µA. Cross-conduction current spikes in

the output stage have been eliminated, making 500kHz

operation practical. Several new features have been incor-

porated. Leading edge blanking has been added to the

current sense comparator. Trims have been added to the

oscillator circuit for both frequency and sink current, and

both of these parameters are tightly specified. The output

stage is clamped to a maximum V_OUTof 18V in the

on state. The output and the reference output are actively

pulled low during undervoltage lockout.

■

Trimmed Bandgap Reference

1A Totem Pole Output

Trimmed Oscillator Frequency and Sink Current

Active Pull-Down on Reference and Output During

Undervoltage Lockout

■

High Level Output Clamp: 18V

^{Current Sense Le}O ^adU ^{ing Edge Blanking}

PPLICATI

■

Off-Line Converters

DC/DC Converters

■

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

BLOCK DIAGRA

LOCKOUT

REFERENCE ENABLE

REFERENCE PULL-DOWN

5V REF

MAIN BIAS

REF

OUTPUT

PULL-DOWN

OSCILLATOR

R /C

OUTPUT

GND

5.6V

COMP

1mA

–

BLANKING

1.5V

–

2.5V

18V

SENSE

–

1241 BD01

12 3 4 5 6 7...16

中文翻译

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与LT1244相关器件

型号	品牌	获取价格	描述	数据表
LT1244CJ8	Linear	获取价格	IC 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8, 0.300 INCH, HERMETIC SEALE
LT1244CJ8#PBF	Linear	获取价格	IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,DIP,8PIN,CERAMIC
LT1244CN8	Linear	获取价格	High Speed Current Mode Pulse Width Modulators
LT1244CN8#PBF	Linear	获取价格	LT1244 - High Speed Current Mode Pulse Width Modulators; Package: PDIP; Pins: 8; Temperatu
LT1244CS8	Linear	获取价格	LT1244 - High Speed Current Mode Pulse Width Modulators; Package: SO; Pins: 8; Temperature
LT1244CS8#PBF	Linear	获取价格	LT1244 - High Speed Current Mode Pulse Width Modulators; Package: SO; Pins: 8; Temperature
LT1244CS8#TR	Linear	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
LT1244IJ8	Linear	获取价格	IC SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8, Switching Regu
LT1244IN8	Linear	获取价格	High Speed Current Mode Pulse Width Modulators
LT1244IN8#PBF	Linear	获取价格	LT1244 - High Speed Current Mode Pulse Width Modulators; Package: PDIP; Pins: 8; Temperatu

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