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UC1843-HIREL Datenblatt(PDF) 6 Page - Texas Instruments

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Teilenummer UC1843-HIREL
Bauteilbeschribung  CURRENT MODE PWM CONTROLLER (KNOWN GOOD DIE)
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UC1843-HIREL Datenblatt(HTML) 6 Page - Texas Instruments

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CURRENT SENSE CIRCUIT
Peak Current (IS ) is Determined By The Formula
ERROR
AMP
2R
R
1 V
5
COMP
CURRENT
SENSE
GND
IS
R
C
RS
CURRENT
SENSE
COMPARATOR
,1.0 V
RS
ISMAX
1
3
5
OSCILLATOR SECTION
8
4
5
VREF
RT/CT
GROUND
RT
CT
For RT> 5 K f ~
1.72
RTCT
30
10
3
1
0.3
1
2.2
4.7
10
22
47
100
CT - nF
Deadtime vs CT (RT >5 k )
100
30
10
3
100
1 k
10 k
100 k
1 M
f - Frequenc y - Hz
Timing Resistance vs Frequency
OUTPUT SATURATION CHARACTERISTICS
4
3
2
1
0
.01
.02
.03 .04 .05
.07 .1
.2
.3 .4 .5
.7
1
SINK SAT (VOL)
SOURCE SAT
(VCC - VOH)
VCC = 15 V
TA = 25°C
TA = -55 °C
Output Current, Source or Sink - A
UC1843-HiRel
SLUS896A – AUGUST 2009 – REVISED AUGUST 2009 .................................................................................................................................................. www.ti.com
A small RC filter may be required to suppress switch transients.
6
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): UC1843-HiRel


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