Datasheet > LT1952EGN

LT1952EGN

更新时间： 2024-10-02 22:11:43

品牌	Logo	应用领域
凌特 - Linear		开关控制器
页数	文件大小	规格书
24页	253K
描述
Single Switch Synchronous Forward Controller

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中文翻译

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LT1952EGN 数据手册

LT1952

Single Switch Synchronous

Forward Controller

DESCRIPTIO

FEATURES

■

Synchronous Rectifier Control for High Efficiency

The LT^®1952 is a current mode PWM controller optimized

to control the forward converter topology, using one

primary MOSFET. The LT1952 provides synchronous

rectifier control, resulting in extremely high efficiency. A

programmable Volt-Second clamp provides a safeguard

for transformer reset that prevents saturation. This allows

a single MOSFET on the primary side to reliably run at

greater than 50% duty cycle for high MOSFET, trans-

former and rectifier utilization. The LT1952 includes

soft-start for controlled exit from shutdown, overcurrent

conditions and undervoltage lockout. A precision 100mV

current limit threshold, independent of duty cycle, com-

bineswithsoft-starttoprovidehiccupshortcircuitprotec-

tion. Micropower start-up allows the LT1952 to be effi-

ciently started from high input voltages. Programmable

slope compensation and leading edge blanking allow

optimization of loop bandwidth with a wide range of

inductorsandMOSFETs. TheLT1952canbeprogrammed

over a 100kHz to 500kHz frequency range and the part can

be synchronized to an external clock. The error amplifier

is a true op amp, allowing a wide range of compensation

networks. The LT1952 is available in a small 16-pin SSOP

■

Programmable Volt-Second Clamp

■

Output Power Levels from 25W to 500W

■

Low Current Start-Up

True PWM Soft-Start

■

Low Stress Short Circuit Protection

■

Precision 100mV Current Limit Threshold

■

Adjustable Delay for Synchronous Timing

■

Accurate Shutdown Threshold with Programmable

Hysteresis

■

Programmable Slope Compensation

■

Programmable Leading Edge Blanking

■

Programmable Frequency (100kHz to 500kHz)

■

Synchronizable to an External Clock up to 1.5 • f_OSC

■

Internal 1.23V Reference

■

2.5V External Reference

■

Current Mode Control

■

Small 16-Pin SSOP Package

APPLICATIO S

■

Telecommunications Power Supplies

Industrial and Distributed Power

Isolated and Non-Isolated DC/DC Converters

■

package.

■

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

TYPICAL APPLICATIO

36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter

12V Bus Converter

V_OUTvs V_IN

PA0905

PA1494.242

12V

20A

OUT

SUPPLY FROM BIAS

WINDING OF T1

10µF

47µF

16V

X5R

×2

REF

52.3k

100k

Si7370

×2

PH4840

COMP

×2

Si7450

SS_MAXDC

OUT

340k

LT1952

0.005Ω

SENSE

SD_V

SEC

LTC3900

13k

SYNC

GND

SOUT

SYNC

560Ω

220pF

OSC

(V)

PGND BLANK DELAY

40k 40k

0.1µF

1952 TA01b

178k

1952 TA01

1952f

12 3 4 5 6 7...24

中文翻译

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与LT1952EGN相关器件

型号	品牌	获取价格	描述	数据表
LT1952EGN-1	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952EGN-1#TR	Linear	获取价格	LT1952 - Single Switch Synchronous Forward Controller; Package: SSOP; Pins: 16; Temperatur
LT1952EGN-1PBF	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952EGN-1TR	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952EGN-1TRPBF	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952EGNPBF	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952EGNTR	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952EGNTRPBF	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952IGN	Linear	获取价格	Single Switch Synchronous Forward Controller
LT1952IGN-1	Linear	获取价格	Single Switch Synchronous Forward Controller

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