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UC1843-HIREL Fiches technique(PDF) 5 Page - Texas Instruments

No de pièce UC1843-HIREL
Description  CURRENT MODE PWM CONTROLLER (KNOWN GOOD DIE)
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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UC1843-HIREL Fiches technique(HTML) 5 Page - Texas Instruments

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ERROR AMP CONFIGURATION
_
+
2.5 V
2
1
VFB
COMP
ZF
ZI
0.5 mA
UNDER-VOLTAGE LOCKOUT
VCC
<17 mA
<1 mA
VOFF
VON
VCC
7
VCC
ON/OFF Command
to REST of IC
VON
VOFF
8.4 V
7.6 V
UC1843-HiRel
www.ti.com .................................................................................................................................................. SLUS896A – AUGUST 2009 – REVISED AUGUST 2009
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated, these specifications apply for –55°C
≤ TA ≤ 125°C; VCC = 15 V; RT = 10 kW; CT = 3.3 nF,TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
7.8
8.4
9.0
V
Min. Operating Voltage After Turn On
7.0
7.6
8.2
PWM SECTION
Maximum Duty Cycle
95%
97%
100%
Minimum Duty Cycle
0%
TOTAL STANDBY CURRENT
Start-Up Current
0.5
1
mA
Operating Supply Current
VPIN 2 = VPIN 3 = 0 V
11
17
VCC Zener Voltager
ICC = 25 mA
30
34
V
Error amp can source or sink up to 0.5 mA.
During under-voltage lock-out, the output drive is biased to sink minor amounts of current. Pin 6 should be
shunted to ground with a bleeder resistor to prevent activating the power switch with extraneous leakage
currents.
Copyright © 2009, Texas Instruments Incorporated
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