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UCC3802 Datasheet(PDF) 1 Page - Texas Instruments

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Part # UCC3802
Description  Low-Power BiCMOS Current-Mode PWM
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
SLUS270C - MARCH 1999 - REVISED JANUARY 2005
FEATURES
• 100µA Typical Starting Supply Current
• 500µA Typical Operating Supply
Current
• Operation to 1MHz
• Internal Soft Start
• Internal Fault Soft Start
• Internal Leading-Edge Blanking of the
Current Sense Signal
• 1 Amp Totem-Pole Output
• 70ns Typical Response from
Current-Sense to Gate Drive Output
• 1.5% Tolerance Voltage Reference
• Same Pinout as UC3842 and
UC3842A
DESCRIPTION
The UCC1800/1/2/3/4/5 family of high-speed, low-power integrated cir-
cuits contain all of the control and drive components required for off-line
and DC-to-DC fixed frequency current-mode switching power supplies
with minimal parts count.
These devices have the same pin configuration as the UC1842/3/4/5
family, and also offer the added features of internal full-cycle soft start
and internal leading-edge blanking of the current-sense input.
The UCC1800/1/2/3/4/5 family offers a variety of package options, tem-
perature range options, choice of maximum duty cycle, and choice of
critical voltage levels. Lower reference parts such as the UCC1803 and
UCC1805 fit best into battery operated systems, while the higher refer-
ence and the higher UVLO hysteresis of the UCC1802 and UCC1804
make these ideal choices for use in off-line power supplies.
The UCC180x series is specified for operation from –55
oC to +125oC,
the UCC280x series is specified for operation from –40
oCto+85oC, and
the UCC380x series is specified for operation from 0
oCto+70oC.
Low-Power BiCMOS Current-Mode PWM
Part Number
Maximum Duty Cycle
Reference Voltage
Turn-On Threshold
Turn-Off Threshold
UCCx800
100%
5V
7.2V
6.9V
UCCx801
50%
5V
9.4V
7.4V
UCCx802
100%
5V
12.5V
8.3V
UCCx803
100%
4V
4.1V
3.6V
UCCx804
50%
5V
12.5V
8.3V
UCCx805
50%
4V
4.1V
3.6V
application
INFO
available
BLOCK DIAGRAM
UDG92009-3


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