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參數資料
| 型號： | UC3844AD |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SOIC-14 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 463K |
| 代理商： | UC3844AD |
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
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相關PDF資料 |
PDF描述 |
|---|---|
| UC3844ADM | CURRENT MODE PWM CONTROLLER |
| UC3844AM | CURRENT MODE PWM CONTROLLER |
| UC3842AD | CURRENT MODE PWM CONTROLLER |
| UC3842ADM | CURRENT MODE PWM CONTROLLER |
| UC3842AM | CURRENT MODE PWM CONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UC3844AD | 制造商:Texas Instruments 功能描述:Pulse Width Modulation (PWM) Controller 制造商:Texas Instruments 功能描述:IC, CURRENT MODE PWM CTRL, 25V, SOIC-14 |
| UC3844AD1 | 功能描述:開關變換器、穩(wěn)壓器與控制器 RO 511-UC3844BD 9/04 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| UC3844AD8 | 功能描述:電流型 PWM 控制器 Current Mode 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 |
| UC3844AD8 | 制造商:Texas Instruments 功能描述:PWM CONTROLLER SMD 3844 SOIC8 |
| UC3844AD8 | 制造商:Texas Instruments 功能描述:IC CURRENT MODE PWM CTRL 25V 8-SOIC 制造商:Texas Instruments 功能描述:IC, CURRENT MODE PWM CTRL, 25V, 8-SOIC |
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