SG3845N

更新时间： 2024-11-22 22:43:15

品牌	Logo	应用领域
美高森美 - MICROSEMI		开关光电二极管控制器
页数	文件大小	规格书
12页	216K
描述
CURRENT MODE PWM CONTROLLER

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中文翻译

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数据手册

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SG3845N 数据手册

LIN DOC #: 1844

SG1844/SG1845 Series

U R R E N T M O D E P W M C O N T R O L L E R

T H E I N F I N I T E P O W E R O F I N N O V A T I O N

P R O D U C T I O N D A T A S H E E T

DESCRIPTION

KEY FEATURES

■ OPTIMIZED FOR OFF-LINE CONTROL

■ LOW START-UP CURRENT (<1mA)

■ AUTOMATIC FEED FORWARD

COMPENSATION

■ TRIMMED OSCILLATOR DISCHARGE

The SG1844/45 family of control ICs

provides all the necessary features to

implement off-line fixed frequency,

current-mode switching power supplies

with a minimum number of external

components. Current-mode architecture

demonstrates improved line regulation,

improved load regulation, pulse-by-

pulse current limiting and inherent

protection of the power supply output

switch.

The bandgap reference is trimmed to

1ꢀ over temperature. Oscillator

discharge current is trimmed to less than

1ꢁꢀ. The SG1844/45 has under-

voltage lockout, current-limiting circuitry

and start-up current of less than 1mA.

The totem-pole output is optimized to

drive the gate of a power MOSFET. The

output is low in the off state to provide

direct interface to an N-channel device.

Both operate up to a maximum duty

cycle range of zero to <5ꢁꢀ due to an

internal toggle flip-flop which blanks the

output off every other clock cycle.

The SG1844/45 is specified for

operation over the full military ambient

temperature range of -55°C to 125°C.

The SG2844/45 is specified for the

industrial range of -25°C to 85°C, and

the SG3844/45 is designed for the

commercial range of ꢁ°C to 7ꢁ°C.

CURRENT

■ PULSE-BY-PULSE CURRENT LIMITING

■ ENHANCED LOAD RESPONSE

CHARACTERISTICS

■ UNDER-VOLTAGE LOCKOUT WITH 6V

HYSTERESIS (SG1844 only)

■ DOUBLE PULSE SUPPRESSION

■ HIGH-CURRENT TOTEM-POLE OUTPUT

■ INTERNALLY TRIMMED BANDGAP

REFERENCE

■ 500kHz OPERATION

■ UNDERVOLTAGE LOCKOUT

SG1844 - 16 volts

SG1845 - 8.4 volts

PRODUCT HIGHLIGHT

■ LOW SHOOT-THROUGH CURRENT <75mA

OVER TEMPERATURE

TYPICAL APPLICATION OF SG3844 IN A FLYBACK CONVERTER

HIGH RELIABILITY FEATURES

R_ST

■ AVAILABLE TO MIL-STD-883B

■

LINFINITY LEVEL "S" PROCESSING AVAILABLE

I_ST

INPUT

V_CC

SG3844

PACKAGE ORDER INFORMATION

Plastic DIP

8-pin

Plastic DIP

14-pin

Plastic SOIC

8-pin

Plastic SOIC

14-pin

Ceramic DIP

8-pin

Ceramic DIP

14-pin

Cer. Flatpack Ceramic LCC

1ꢁ-pin 2ꢁ-pin

T_A(°C)

0 to 70

SG3844M

SG3844N

SG3844DM

SG3844D

SG3844Y

SG3845Y

SG2844Y

SG2845Y

SG1844Y

SG1845Y

SG3844J

SG3845J

SG2844J

SG2845J

SG1844J

SG1845J

—

SG3845M

SG3845N

SG3845DM

SG3845D

SG2844M

SG2844N

SG2844DM

SG2844D

—

-25 to 85

-55 to 125

MIL-STD/883

DESC

SG2845M

SG2845N

SG2845DM

SG2845D

—

SG1844L

SG1845L

SG1844Y/883B SG1844J/883B

SG1845Y/883B SG1845J/883B

SG1844L/883B

SG1845L/883B

SG1844Y/DESC SG1844J/DESC SG1844F/DESC SG1844L/DESC

SG1845Y/DESC SG1845J/DESC SG1845F/DESC SG1845L/DESC

Note: All surface-mount packages are available in Tape & Reel.

F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

Rev. 1.4 4/00

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

12 3 4 5 6 7...12

中文翻译

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与SG3845N相关器件

型号	品牌	获取价格	描述	数据表
SG3845Y	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3846	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3846	MICROCHIP	获取价格	The SG1846 family of control ICs provides the required features to implement Fixed Frequen
SG3846DW	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3846J	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3846N	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3846Q	MICROSEMI	获取价格	暂无描述
SG3847J	MICROSEMI	获取价格	Switching Controller, Current-mode, 0.5A, 500kHz Switching Freq-Max, CDIP16
SG3847N	MICROSEMI	获取价格	Switching Controller, Current-mode, 0.5A, 500kHz Switching Freq-Max, PDIP16
SG388/D	ETC	获取价格	AC−DC Controllers and Regulators,ON Semiconductor Master Components Selector Guide

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