Datasheet > LT1243

LT1243

更新时间： 2023-12-20 18:44:04

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	1183K
描述
高速电流模式脉宽调制器

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LT1243 数据手册

LT1241 Series

High Speed Current Mode

Pulse Width Modulators

FEATURES

DESCRIPTION

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

current mode, pulse width modulators. They are improved

plug compatible versions of the industry standard UC1842

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

error amplifier, current sensing comparator and a high

current totem pole output stage ideally suited to driv-

ing 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 out-

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

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 Leading Edge Blanking

APPLICATIONS

Off-Line Converters

DC/DC Converters

put stage is clamped to a maximum V

on state. The output and the reference output are actively

pulled low during undervoltage lockout.

of 18V in the

OUT

All registered trademarks and trademarks are the property of their respective owners.

BLOCK DIAGRAM

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