UC2845N

更新时间： 2024-11-23 04:48:15

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
11页	100K
描述
CURRENTMODE 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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UC2845N 数据手册

UC2842/3/4/5

UC3842/3/4/5

CURRENT MODE PWM CONTROLLER

OPTIMIZED FOR OFF-LINE AND DC TO DC

CONVERTERS

LOW START-UP CURRENT (< 1 mA)

AUTOMATIC FEED FORWARD COMPENSA-

TION

PULSE-BY-PULSECURRENT LIMITING

ENHANCED LOAD RESPONSE CHARAC-

TERISTICS

UNDER-VOLTAGELOCKOUTWITHHYSTER-

ESIS

DOUBLE PULSE SUPPRESSION

HIGH CURRENT TOTEM POLE OUTPUT

INTERNALLY TRIMMED BANDGAP REFER-

ENCE

SO14

Minidip

logicto insure latchedoperation,a PWM compara-

torwhichalsoprovidescurrentlimitcontrol,andato-

tem pole output stage designed to source or sink

high peak current. The output stage, suitable for

drivingN-ChannelMOSFETs,islow intheoff-state.

500 KHz OPERATION

LOW R ERRORAMP

Differencesbetweenmembersof this familyarethe

under-voltage lockout thresholds and maximum

duty cycle ranges. The UC3842 and UC3844 have

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

suited off-line applications The corresponding

thresholds for the UC3843 and UC3845 are 8.5 V

and 7.9 V. The UC3842 and UC3843 can operate

to duty cycles approaching 100%. A range of the

zero to < 50 % is obtained by the UC3844 and

UC3845by theadditionof aninternaltoggleflip flop

which blanksthe outputoff every otherclock cycle.

DESCRIPTION

TheUC3842/3/4/5family ofcontrolICsprovidesthe

necessary features to implement off-line or DC to

DC fixed frequency current mode controlschemes

witha minimalexternalpartscount.Internallyimple-

mentedcircuitsincludeundervoltagelockoutfeatur-

ing start-up current less than 1 mA, a precisionref-

erencetrimmed foraccuracyat theerroramp input,

BLOCK DIAGRAM (toggle flip flop used only in U3844 and UC3845)

1/11

October 1998

12 3 4 5 6 7...11

中文翻译

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UC2845N 替代型号

型号	品牌	替代类型	描述	数据表
UC3844D	TI	功能相似	Current Mode PWM Controller
UC2843D	TI	功能相似	Current Mode PWM Controller
UC3842D	TI	功能相似	Current Mode PWM Controller

与UC2845N相关器件

型号	品牌	获取价格	描述	数据表
UC2845NG	ONSEMI	获取价格	High Performance Current Mode Controllers
UC2845NG4	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC2845P	ETC	获取价格	Current-Mode SMPS Controller
UC2845Q	ETC	获取价格	Current-Mode SMPS Controller
UC2845QTR	ETC	获取价格	Current-Mode SMPS Controller
UC2845W	ETC	获取价格	SMPS Controller
UC2846	TI	获取价格	Current Mode PWM Controller
UC2846	UTC	获取价格	current mode pwm controller
UC2846AN	TI	获取价格	1.5A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP16
UC2846DW	TI	获取价格	Current Mode PWM Controller