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參數資料
| 型號： | UC3843BN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩壓器 |
| 英文描述： | HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 96K |
| 代理商： | UC3843BN |
UC2842/3/4/5
UC3842/3/4/5
October 1998
CURRENT MODE PWM CONTROLLER
.
OPTIMIZED FOR OFF-LINE AND DC TO DC
CONVERTERS
.
LOWSTART-UP CURRENT (< 1 mA)
.
AUTOMATIC FEED FORWARD COMPENSA-
TION
.
PULSE-BY-PULSECURRENT LIMITING
.
ENHANCED LOAD RESPONSE CHARAC-
TERISTICS
.
UNDER-VOLTAGELOCKOUTWITHHYSTER-
ESIS
.
DOUBLEPULSESUPPRESSION
.
HIGH CURRENT TOTEM POLEOUTPUT
.
INTERNALLY TRIMMED BANDGAP REFER-
ENCE
.
500 KHz OPERATION
.
LOWR
O
ERRORAMP
DESCRIPTION
TheUC3842/3/4/5familyofcontrolICsprovidesthe
necessary features to implement off-line or DC to
DC fixed frequencycurrent mode controlschemes
witha minimalexternalpartscount.Internallyimple-
mentedcircuitsincludeundervoltagelockoutfeatur-
ingstart-up current lessthan1 mA,a precisionref-
erencetrimmedforaccuracyat theerrorampinput,
logicto insurelatchedoperation,a PWMcompara-
torwhichalsoprovidescurrentlimitcontrol,andato-
tem pole output stage designed to source or sink
high peak current. The output stage, suitable for
drivingN-ChannelMOSFETs,islowintheoff-state.
Differencesbetweenmembersof thisfamilyarethe
under-voltage lockout thresholds and maximum
dutycycle ranges.The UC3842 and UC3844 have
UVLO thresholdsof 16V (on) and 10V (off), ideally
suited off-line applications The corresponding
thresholdsfor 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
UC3845bytheadditionof aninternaltoggleflipflop
whichblanksthe outputoff every otherclock cycle.
BLOCK DIAGRAM
(toggle flip flop used only in U3844 and UC3845)
Minidip
SO14
1/11
相關PDF資料 |
PDF描述 |
|---|---|
| UC3843BVD | HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| UC3843BD1 | TVS BI-DIRECTIONAL 36V 600W SMB |
| UC2843BD1 | DIODE, TVS, POLARIZED, SMBJ40A, 40V, DIO_SMB_POL |
| UC3843D1 | CRYS 32.768KHZ 6PF ECX-306 (8.0X3.8) OR OSCILENT 223-000306-20-TR |
| UC3843AN | SMPS Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UC3843BNG | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM w/96% Duty Cycle Max RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3843BVD | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3843BVD1 | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3843BVD1G | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM w/96% Duty Cycle Max RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3843BVD1R2 | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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