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參數(shù)資料
| 型號： | UC1845LQMLV |
| 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： | UC1845LQMLV |
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 |
|---|---|
| UC2842DR | Current Mode PWM Controller |
| UC2842DW | Current Mode PWM Controller |
| UC3842P | Current Mode PWM Controller |
| UC3844J | Current Mode PWM Controller |
| UC3844P | Current Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC1845N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SMPS Controller |
| UC1845Q | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SMPS Controller |
| UC1845W | 制造商:Texas Instruments 功能描述:Current Mode PWM Controller 1A 14-Pin CFPAK Tube |
| UC1845W883B | 制造商:Texas Instruments 功能描述:Current Mode PWM Controller 1A 14-Pin CFPAK Tube |
| UC1846 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller |
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