UC2845BN

更新时间： 2024-11-23 07:05:27

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		开关光电二极管控制器
页数	文件大小	规格书
15页	137K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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中文翻译

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数据手册
替代型号

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UC2845BN 数据手册

UC2842B/3B/4B/5B

UC3842B/3B/4B/5B

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

TRIMMED OSCILLATOR FOR PRECISE FRE-

QUENCY CONTROL

OSCILLATOR FREQUENCY GUARANTEED

AT 250kHz

CURRENT MODE OPERATION TO 500kHz

AUTOMATIC FEED FORWARD COMPENSA-

TION

Minidip

SO8

LATCHING PWM FOR CYCLE-BY-CYCLE

CURRENT LIMITING

INTERNALLY TRIMMED REFERENCE WITH

UNDERVOLTAGE LOCKOUT

HIGH CURRENT TOTEM POLE OUTPUT

UNDERVOLTAGE LOCKOUT WITH HYSTER-

ESIS

comparatorwhichalsoprovidescurrentlimitcontrol,

and a totem pole output stage designed to source

orsinkhighpeakcurrent.Theoutputstage,suitable

for driving N-Channel MOSFETs, is low in the off-

state.

LOW START-UPAND OPERATINGCURRENT

Differencesbetween members of this family are the

under-voltagelockoutthresholdsandmaximum duty

cycle ranges. The UC3842B and UC3844B have

UVLO thresholds of 16V (on) and 10V (off), ideally

suitedoff-lineapplicationsThecorrespondingthresh-

oldsfortheUC3843BandUC3845Bare8.5Vand7.9

V. The UC3842B and UC3843B can operateto duty

cycles approaching100%. A range of the zero to <

50 % is obtainedby the UC3844Band UC3845Bby

theadditionofan internaltoggleflipflopwhichblanks

theoutputoff everyotherclock cycle.

DESCRIPTION

TheUC384xBfamilyofcontrolICsprovidesthenec-

essary features to implement off-line or DC to DC

fixedfrequencycurrent modecontrol schemes with

a minimal external parts count. Internally imple-

mentedcircuits includea trimmed oscillator for pre-

cise DUTY CYCLE CONTROL under voltagelock-

outfeaturingstart-upcurrentlessthan0.5mA,a pre-

cision reference trimmed for accuracy at the error

ampinput,logicto insurelatchedoperation,a PWM

BLOCK DIAGRAM (toggle flip flop used only in UC3844B and UC3845B)

UVLO

34V

REF

VREF

5V 50mA

S/R

GROUND

INTERNAL

BIAS

2.50V

VREF GOOD

LOGIC

OUTPUT

RT/CT

OSC

ERROR AMP.

VFB

PWM

LATCH

COMP

CURRENT

SENSE

UC3842B

CURRENT

SENSE

COMPARATOR

D95IN331

1/15

March 1999

12 3 4 5 6 7...15

中文翻译

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UC2845BN 替代型号

型号	品牌	替代类型	描述	数据表
UC2845BD1013TR	STMICROELECTRONICS	完全替代	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3845AN	STMICROELECTRONICS	完全替代	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC2843AN	STMICROELECTRONICS	完全替代	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

与UC2845BN相关器件

型号	品牌	获取价格	描述	数据表
UC2845BNG	ONSEMI	获取价格	High Performance Current Mode Controllers
UC2845D	MOTOROLA	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2845D	FREESCALE	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2845D	TI	获取价格	Current Mode PWM Controller
UC2845D	STMICROELECTRONICS	获取价格	CURRENTMODE PWM CONTROLLER
UC2845D	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2845D	ROCHESTER	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, GREEN, PLASTIC, MS-012AB, SOIC
UC2845D013TR	STMICROELECTRONICS	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, SO-14
UC2845D8	TI	获取价格	Current Mode PWM Controller
UC2845D8	ROCHESTER	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, GREEN, PLASTIC, MS-012AA, SOIC-

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