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AS3844

Description
1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
CategoryPower/power management   
File Size158KB,20 Pages
ManufacturerETC
Download Datasheet View All

AS3844 Overview

1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14

SEMICONDUCTOR
AS384x
Current Mode Controller
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
T
/C
T
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.
Features
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2.5 V bandgap reference trimmed to
1.0% and temperature-compensated
Standard temperature range extended
to 105¡C
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
Top view
Pin Configuration Ñ
PDIP (N)
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
8
7
6
5
8L SOIC (D8)
V
REG
V
CC
OUT
GND
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
8
7
6
5
14L SOIC (D14)
V
REG
V
CC
OUT
GND
COMP
NC
V
FB
NC
I
SENSE
NC
R
T
/C
T
1
2
3
4
5
6
7
14
V
REG
13
NC
12
V
CC
11
V
C
10
OUT
9
8
PWR G
GND
Ordering Information
AS384X
Circuit Type:
Current Mode Controller (See Table A)
Package Style
D8 = 8 Pin Plastic SOIC
D14 = 14 Pin Plastic SOIC
N = 8 Pin Plastic DIP
D8
13
Packaging Option:
T = Tube
13 = Tape and Reel (13" Reel Dia)
Table A
Model
AS3842
AS3843
AS3844
AS3845
V
CC(min)
10
7.6
10
7.6
V
CC(on)
16
8.4
16
8.4
Duty Cycle
Typ.
97%
97%
49.5%
49.5%
I
CC
0.5 mA
0.3 mA
0.5 mA
0.3 mA
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