Datasheet > LT1246C

LT1246C

更新时间： 2024-11-22 22:34:27

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
12页	291K
描述
1MHz Off-Line Current Mode PWM and DC/DC Converter

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LT1246C 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

下载PDF

与LT1246C相关器件

型号	品牌	获取价格	描述	数据表
LT1246CJ8	Linear	获取价格	IC 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8, CERDIP-8, Switching Regul
LT1246CN8	Linear	获取价格	1MHz Off-Line Current Mode PWM and DC/DC Converter
LT1246CS8	Linear	获取价格	1MHz Off-Line Current Mode PWM and DC/DC Converter
LT1246CS8#PBF	Linear	获取价格	LT1246 - 1MHz Off-Line Current Mode PWM and DC/DC Converter; Package: SO; Pins: 8; Tempera
LT1246CS8#TR	Linear	获取价格	Switching Controller, Current-mode, 1A, 1000kHz Switching Freq-Max, BIPolar, PDSO8
LT1246IN8	Linear	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8, Switching Reg
LT1246IS8	Linear	获取价格	IC 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SOIC-8, Switchin
LT1246MJ8	Linear	获取价格	IC 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8, CERDIP-8, Switching Regul
LT1246MJ8/883B	Linear	获取价格	IC 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8, CERDIP-8, Switching Regul
LT1247	Linear	获取价格	1MHz Off-Line Current Mode PWM and DC/DC Converter

与LT1246C相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

35
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

26
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

54
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

52

产品中心

服务支持

精选活动

关于我们

帮助中心

LT1246C

LT1246C 数据手册

与LT1246C相关器件

与LT1246C相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LT1246C

LT1246C 数据手册

与LT1246C相关器件

与LT1246C相关文章

您还可以找

您在本页遇到什么问题？