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參數(shù)資料
| 型號： | AS3842D1413 |
| 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 |
| 文件大小： | 155K |
| 代理商： | AS3842D1413 |
1
ASTEC Semiconductor
AS384x
Current Mode Controller
Features
￥
2.5 V bandgap reference trimmed to
1.0% and temperature-compensated
￥
Standard temperature range extended
to 105C
￥
AS3842/3 oscillations trimmed for
precision duty cycle clamp
￥
AS3844/5 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
Description
The AS3842 family of control ICs provide pin-for-pin replacement of the
industry standard UC3842 series of devices. The devices are
redesigned to provide significantly improved tolerances in power sup-
ply manufacturing. The 2.5 V reference has been trimmed to 1.0%
tolerance. The oscillator discharge current is trimmed to provide guar-
anteed duty cycle clamping rather than specified discharge current.
The circuit is more completely specified to guarantee all parameters
impacting power supply manufacturing tolerances.
In addition, the oscillator and flip-flop sections have been enhanced to
provide additional performance. The R
/C
pin now doubles as a syn-
chronization 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 topol-
ogy allows the duty cycle on the AS3844/5 to be guaranteed between
49 and 50%. The AS3843/5 requires less than 0.5 mA of start-up cur-
rent over the full temperature range.
SEMICONDUCTOR
Pin Configuration
Top view
14L SOIC (D14)
8L SOIC (D8)
1
2
3
4
8
7
6
5
V
REG
V
CC
OUT
GND
COMP
V
FB
I
SENSE
R
T
/C
T
V
REG
NC
V
CC
V
C
COMP
NC
V
FB
OUT
PWR G
GND
I
SENSE
NC
R
T
/C
T
NC
PDIP (N)
V
REG
V
CC
OUT
GND
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
8
7
6
5
1
2
3
5
6
7
4
14
13
12
11
10
9
8
Circuit Type:
Current Mode Controller (See Table A)
Package Style
D8 =
D14 =
N =
8
14
8
Pin Plastic SOIC
Pin Plastic SOIC
Pin Plastic DIP
AS384X D8 13
Packaging Option:
T
13
= Tape and Reel (13" Reel Dia)
= Tube
Ordering Information
Table A
Duty Cycle
Typ.
Model
V
CC(min)
10
7.6
10
7.6
V
CC(on)
16
8.4
16
8.4
I
CC
AS3842
AS3843
AS3844
AS3845
97%
97%
49.5%
49.5%
0.5 mA
0.3 mA
0.5 mA
0.3 mA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS3842D14T | Current Mode Controller |
| AS3842NT | Current Mode Controller |
| AS3842D813 | Current Mode Controller |
| AS3842D8T | Current Mode Controller |
| AS3842N13 | Current Mode Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS3842D14T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS3842D813 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS3842D8T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS3842N13 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS3842NT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
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