參數(shù)資料
型號(hào)： UC3844P
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(yè)數(shù)： 1/19頁(yè)
文件大?。?/td> 937K
代理商： UC3844P
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
UC2842P Current Mode PWM Controller
UC2842DWTR Current Mode PWM Controller
UC2842AN HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2842AD HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2842AN HIGH PERFORMANCE CURRENT MODE CONTROLLERS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UC3844Q 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller
UC3844QTR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller
UC3844-S08-R 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3844-S08-T 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3844T 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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