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參數(shù)資料
| 型號： | CM3842 |
| 廠商： | Electronic Theatre Controls, 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)： | 2/12頁 |
| 文件大?。?/td> | 638K |
| 代理商： | CM3842 |
CM3842/3843
C
URRENT
M
ODE
PWM C
ONTROLLER
2001/06/27
Advanced
Champion Microelectronic Corporation
Page 1
GENERAL DESCRIPTION
FEATURES
The CM3842/43 are fixed frequency current-mode PWM
controllers specially designed for OFF-Line switching
power supply and DC-to-DC converters with a minimum
number of external components. These devices feature
a trimmed oscillator for precise duty cycle control, a
temperature compensated reference, high gain error
amplifier, current sensing comparator, and high current
totem pole output which is suitable for driving
MOSFETs.
The under voltage lock-out (U.V.L.O.) is designed to
operated with 200
μ
A typ. start-up current, allowing an
efficient bootstrap supply voltage design. The U.V.L.O.
thresholds for the CM3842 are 16V (on) and 10V (off)
which
are
ideal
for
off-line
corresponding typical threshold for the CM3843 are
8.4V (on) and 7.6V (off). The CM3842/43 can operated
within 100% duty cycle.
APPLICATIONS
!
Off-line flyback or forward converters.
!
DC-to-DC buck or boost converter.
!
Monitor Power Supply
applications.
The
!
Low Start-Up current ( typ. 200
μ
A)
!
Optimized for Off-Line and DC-to-DC Converters
!
Maximum Duty Cycle
!
U.V.L.O. with Hysteresis
!
Operating Frequency Up to 500KHz
!
Internal Trimmed Bandgap Reference
!
High Current Totem Pole Output
!
Error Amplifier With Low Output Resistance
!
Available in 8-Pin Plastic DIP and Surface Mount
8-Pin S.O.I.C.
PIN CONFIGURATION
8-Pin PDIP
(Top View)
AVAILABLE OPTIONS
Device
Start-UP
Voltage
CM3842
16V
Hysteresis Max. Duty Cycle
6V
< 100%
CM3843
8.4V
0.8V
< 100%
8-Pin S.O.I.C.
(Top View)
COMP
V
F
B
I
SENSE
V
REF
GND
OUTPUT
V
CC
R
T
/C
T
COMP
V
F
B
I
SENSE
V
REF
GND
OUTPUT
V
CC
R
T
/C
T
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CM3842CP | CURRENT MODE PWM CONTROLLER |
| CM3842CS | CURRENT MODE PWM CONTROLLER |
| CM3843 | CURRENT MODE PWM CONTROLLER |
| CM3843CP | CURRENT MODE PWM CONTROLLER |
| CM3843CS | CURRENT MODE PWM CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CM3842CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CURRENT MODE PWM CONTROLLER |
| CM3842CS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CURRENT MODE PWM CONTROLLER |
| CM3843 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CURRENT MODE PWM CONTROLLER |
| CM3843CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CURRENT MODE PWM CONTROLLER |
| CM3843CS | 制造商:CHAMP 功能描述: |
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