- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄381146 > UC3843AQTR Current-Mode SMPS Controller PDF資料下載
參數(shù)資料
| 型號(hào)： | UC3843AQTR |
| 英文描述： | Current-Mode SMPS Controller |
| 中文描述： | 電流模式開(kāi)關(guān)電源控制器 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 463K |
| 代理商： | UC3843AQTR |
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
Current Mode PWM Controller
FEATURES
Optimized For Off-line And DC
To DC Converters
Low Start Up Current (<1mA)
Automatic Feed Forward
Compensation
Pulse-by-pulse Current Limiting
Enhanced Load Response
Characteristics
Under-voltage Lockout With
Hysteresis
Double Pulse Suppression
High Current Totem Pole
Output
Internally Trimmed Bandgap
Reference
500khz Operation
Low R
O
Error Amp
DESCRIPTION
The UC1842/3/4/5 family of control ICs provides the necessary features to im-
plement off-line or DC to DC fixed frequency current mode control schemes
with a minimal external parts count. Internally implemented circuits include un-
der-voltage lockout featuring start up current less than 1mA, a precision refer-
ence trimmed for accuracy at the error amp input, logic to insure latched
operation, a PWM comparator which also provides current limit control, and a
totem pole output stage designed to source or sink high peak current. The out-
put stage, suitable for driving N Channel MOSFETs, is low in the off state.
Differences between members of this family are the under-voltage lockout
thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have
UVLO thresholds of 16V (on) and 10V (off), ideally suited to off-line applica-
tions. The corresponding thresholds for the UC1843 and UC1845 are 8.4V
and 7.6V. The UC1842 and UC1843 can operate to duty cycles approaching
100%. A range of zero to 50% is obtained by the UC1844 and UC1845 by the
addition of an internal toggle flip flop which blanks the output off every other
clock cycle.
BLOCK DIAGRAM
A/B
Note 1: A = DIL-8 Pin Number. B = SO-14 Pin Number.
Note 2: Toggle flip flop used only in 1844 and 1845.
4/97
Powered by ICminer.com Electronic-Library Service CopyRight 2003
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC3843AY | 10-line IPAD", EMI filter including ESD protection |
| UC3843Q | Current-Mode SMPS Controller |
| UC3843TN | 16-bit dual supply bus transceiver level translator with a side series resistor |
| UC3845ADMT | Low voltage CMOS hex inverter (open drain) with 5 V tolerant inputs |
| UC3845ADT | Low voltage CMOS hex buffer (open drain) with 5 V tolerant inputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3843A-S08-R | 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:CURRENT MODE PWM CONTROL CIRCUITS |
| UC3843A-S08-T | 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:CURRENT MODE PWM CONTROL CIRCUITS |
| UC3843AY | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| UC3843B | 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| UC3843BCD1G | 制造商:ON Semiconductor 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。