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AS2845D-8 Datasheet

  • AS2845D-8

  • Current Mode Controller

  • 98.12KB

  • 20頁(yè)

  • ETC

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AS2842/3/4/5
Features
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.
Current Mode Controller
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2.5 V bandgap reference
trimmed to 1.0% and
temperature-compensated
Extended temperature range
from - 40 to 105擄 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
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Ordering Information
Description
Temperature Range
Order Codes
8-Pin Plastic DIP
8-Pin Plastic SOIC
-40 to 105擄 C
-40 to 105擄 C
AS2842/3/4/5N
AS2842/3/4/5D-8
Pin Configuration
鈥?/div>
PDIP (N)
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
Top view
8L SOIC (D)
8
7
6
5
V
REG
V
CC
OUT
GND
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
8
7
6
5
V
REG
V
CC
OUT
GND
ASTEC Semiconductor
37

AS2845D-8相關(guān)型號(hào)PDF文件下載

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  • 英文版
    Positive Fixed Voltage Regulator
    ETC
  • 英文版
    1A Low Dropout Voltage Regulator Adjustable & Fixed Output, ...
    SIPEX [Sip...
  • 英文版
    Positive Fixed Voltage Regulator
    ETC
  • 英文版
    1.5A Low Dropout Voltage Regulator Adjustable & Fixed Output...
    SIPEX [Sip...
  • 英文版
    Positive Fixed Voltage Regulator
    ETC
  • 英文版
    3A Low Dropout Voltage Regulator Adjustable & Fixed Output, ...
    SIPEX
  • 英文版
    3A Low Dropout Voltage Regulator Adjustable & Fixed Output, ...
    SIPEX [Sip...
  • 英文版
    Current Mode Controller
    ETC
  • 英文版
    Current Mode Controller
    ETC [ETC]
  • 英文版
    Current Mode Controller
    ETC
  • 英文版
    Current Mode Controller
    ETC [ETC]
  • 英文版
    Current Mode Controller
    ETC
  • 英文版
    Current Mode Controller
    ETC [ETC]
  • 英文版
    Current Mode Controller
    ETC
  • 英文版
    LDO Regulator
    Sipex
  • 英文版
    Positive Fixed Voltage Regulator
    ETC
  • 英文版
    Positive Adjustable Voltage Regulator
    ETC
  • 英文版
    Positive Fixed Voltage Regulator
    ETC
  • 英文版
    Positive Adjustable Voltage Regulator
    ETC
  • 英文版
    Analog IC
    ETC

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