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參數(shù)資料
| 型號： | UC3845J |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Current Mode PWM Controller |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁數(shù)： | 1/19頁 |
| 文件大?。?/td> | 937K |
| 代理商： | UC3845J |
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
implement off-line or DC to DC fixed frequency current mode control schemes
with a minimal external parts count. Internally implemented circuits include
under-voltage lockout featuring start up current less than 1mA, a precision
reference 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
output 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
applications. 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:
Note 2:
A = DIL-8 Pin Number. B = SO-14 and CFP-14 Pin Number.
Toggle flip flop used only in 1844 and 1845.
SLUS223A - APRIL 1997 - REVISED MAY 2002
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC3845P | Current Mode PWM Controller |
| UC1842JQMLV | Current Mode PWM Controller |
| UC1843JQMLV | Current Mode PWM Controller |
| UC1843LQMLV | Current Mode PWM Controller |
| UC1845LQMLV | Current Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3845L-D08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845L-S08-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845L-S08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845N | 功能描述:電流型 PWM 控制器 Current Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845N 93 | 制造商:DIP 功能描述:3845 |
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