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UC1843-HIREL Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części UC1843-HIREL
Szczegółowy opis  CURRENT MODE PWM CONTROLLER (KNOWN GOOD DIE)
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

UC1843-HIREL Arkusz danych(HTML) 1 Page - Texas Instruments

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1
FEATURES
DESCRIPTION
BLOCK DIAGRAM
11
A/B
Vcc
7 12
5
9
GROUND
4
7
RT/CT
2
3
VFB
1
1
COMP
3
5
CURRENT
SENSE
34 V
2.50 V
OSC
UVLO
S/R
5 V
REF
VREF
Good
Logic
Internal
BIAS
Error
Amp
2R
R
1 V
CURRENT
SENSE
COMPARATOR
PWM
LATCH
S
R
T
8 14
VREF
5 V
50 mA
7
VC
10
6
OUTPUT
8
5
POWER
GROUND
UC1843-HiRel
www.ti.com .................................................................................................................................................. SLUS896A – AUGUST 2009 – REVISED AUGUST 2009
CURRENT MODE PWM CONTROLLER (KNOWN GOOD DIE)
• –55°C to 125°C Known Good Die
• Controlled Baseline
The UC1843 family of control devices provides the
necessary features to implement off-line or dc-to-dc
• Optimized For Off-line and DC-to-DC
fixed frequency current mode control schemes with a
Converters
minimal external parts count. Internally implemented
• Low Start-Up Current (<1 mA)
circuits include under-voltage lockout featuring start
• Automatic Feed Forward Compensation
up current less than 1 mA, a precision reference
trimmed for accuracy at the error amp input, logic to
• Pulse-by-Pulse Current Limiting
insure latched operation, a PWM comparator which
• Enhanced Load Response Characteristics
also provides current limit control, and a totem pole
• Under-Voltage Lockout With Hysteresis
output stage designed to source or sink high peak
current.
The
output
stage,
suitable
for
driving
• Double Pulse Suppression
N-Channel MOSFETs, is low in the off state. The
• High Current Totem Pole Output
under-voltage
lockout
threshold
is
8.4
V
and
• Internally Trimmed Bandgap Reference
maximum duty cycle range is around 100%.
• 500-kHz Operation
• Low R
O Error Amp
xxx
ORDERING INFORMATION(1)
TA
PACKAGE(2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
–55°C to 125°C
KGD
UC1843KGD1
NA
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2)
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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