Datasheet > LT1247

LT1247

更新时间： 2024-11-24 14:57:31

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
12页	257K
描述
1MHz 离线式电流模式 PWM 和 DC/DC 转换器

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中文翻译

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数据手册

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LT1247 数据手册

LT1246/LT1247

1MHz Off-Line

Current Mode PWM

and DC/DC Converter

DESCRIPTIO

EATURE

The LT^®1246/LT1247 are 8-pin, fixed frequency, current

mode, pulse width modulators. These devices are de-

signed to be improved plug compatible versions of the

industry standard UC1842 PWM circuit. The LT1246/

LT1247 are optimized for off-line and DC/DC converter

applications. They contain a temperature compensated

reference, high gain error amplifier, current sensing com-

parator, 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 cur-

rent spikes in the totem pole output stage have been

eliminated, making1MHzoperationpractical. Severalnew

features have been incorporated. Leading edge blanking

has been added to the current sense comparator. This

minimizesoreliminatesthefilterthatisnormallyrequired.

Eliminating this filter allows the current sense loop to

operate with minimum delays. 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 under-voltage lockout.

■

Current Mode Operation to 1MHz

30ns Current Sense Delay

< 250µA Low Start-Up Current

Current Sense Leading Edge Blanking

Pin Compatible with UC1842

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

■

18V High Level Output Clamp

O U

PPLICATI

■

Off-Line Converters

DC/DC Converters

■

Minimum

Operating

Voltage

Start-Up

Threshold

Maximum

Duty Cycle

Device

Replaces

LT1246

LT1247

16V

8.4V

10V

7.6V

100%

UC1842

UC1843

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

BLOCK DIAGRA

REFERENCE ENABLE

LOCKOUT

REFERENCE PULLDOWN

5V REF

MAIN BIAS

REF

OUTPUT

PULLDOWN

OSCILLATOR

R /C

OUTPUT

GND

5.6V

COMPENSATION

FEEDBACK

1mA

–

BLANKING

1.5V

–

2.5V

18V

–

SENSE

LT1246 • BD01

12 3 4 5 6 7...12

中文翻译

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与LT1247相关器件

型号	品牌	获取价格	描述	数据表
LT1247_15	Linear	获取价格	1MHz Off-Line Current Mode PWM and DC/DC Converter
LT1247C	Linear	获取价格	1MHz Off-Line Current Mode PWM and DC/DC Converter
LT1247CJ8	Linear	获取价格	IC 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8, Switching
LT1247CN8	Linear	获取价格	1MHz Off-Line Current Mode PWM and DC/DC Converter
LT1247CS8	Linear	获取价格	1MHz Off-Line Current Mode PWM and DC/DC Converter
LT1247CS8#PBF	Linear	获取价格	LT1247 - 1MHz Off-Line Current Mode PWM and DC/DC Converter; Package: SO; Pins: 8; Tempera
LT1247CS8#TR	Linear	获取价格	LT1247 - 1MHz Off-Line Current Mode PWM and DC/DC Converter; Package: SO; Pins: 8; Tempera
LT1247CS8#TRPBF	Linear	获取价格	LT1247 - 1MHz Off-Line Current Mode PWM and DC/DC Converter; Package: SO; Pins: 8; Tempera
LT1247IN8	Linear	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8, Switching Reg
LT1247IS8	Linear	获取价格	IC 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SOIC-8, Switchin

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