UC2845

更新时间： 2024-11-04 07:05:27

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		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

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UC2845 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

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