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參數(shù)資料
| 型號： | AS2842 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Current Mode Controller |
| 中文描述： | 電流模式控制器 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 94K |
| 代理商： | AS2842 |
AS2842/3/4/5
Current Mode Controller
Description
The AS2842 family of control ICs provide pin-for-pin replace-
ment of the industry standard UC3842 series of devices. The
devices are redesigned to provide significantly improved
tolerances in power supply manufacturing. The 2.5 V refer-
ence has been trimmed to 1.0% tolerance. The oscillator
discharge current is trimmed to provide guaranteed duty
cycle clamping rather than specified discharge current. The
circuit is more completely specified to guarantee all param-
eters impacting power supply manufacturing tolerances.
In addition, the oscillator and flip-flop sections have been
enhanced to provide additional performance. The R
T
/C
T
pin
now doubles as a synchronization input that can be easily
driven from open collector/open drain logic outputs. This
sync input is a high impedance input and can easily be used
for externally clocked systems. The new flip-flop topology
allows the duty cycle on the AS2844/5 to be guaranteed
between 49 and 50%. The AS2843/5 requires less than
0.5 mA of start-up current over the full temperature range.
Pin Configuration
—
Top view
Features
2.5 V bandgap reference
trimmed to 1.0% and
temperature-compensated
Extended temperature range
from - 40 to 105
°
C
AS2842/3 oscillations trimmed
for precision duty cycle clamp
AS2844/5 have exact 50% max
duty cycle clamp
Advanced oscillator design
simplifies synchronization
Improved specs on UVLO
and hysteresis provide
more predictable start-up
and shutdown
Improved 5 V regulator provides
better AC noise immunity
Guaranteed performance
with current sense pulled
below ground
Over-temperature shutdown
8L SOIC (D)
8
1
COMP
V
REG
7
2
V
FB
V
CC
6
3
I
SENSE
OUT
5
4
R
T
/C
T
GND
PDIP (N)
8
1
COMP
V
REG
7
2
V
FB
V
CC
6
3
I
SENSE
OUT
5
4
R
T
/C
T
GND
Ordering Information
Description
8-Pin Plastic DIP
8-Pin Plastic SOIC
Temperature Range
-40 to 105
°
C
-40 to 105
°
C
Order Codes
AS2842/3/4/5N
AS2842/3/4/5D-8
ASTEC Semiconductor
37
相關PDF資料 |
PDF描述 |
|---|---|
| AS2843 | Current Mode Controller |
| AS2844 | Current Mode Controller |
| AS2845D-8 | Current Mode Controller |
| AS2845N | Current Mode Controller |
| AS2850AT-1.5 | Analog IC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AS2843 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS2844 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS2845 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS28450FLF | 制造商:TT Electronics / IRC 功能描述:AS28450FLF |
| AS28450HLF | 制造商:TT Electronics / IRC 功能描述:AS28450HLF |
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