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UCC380001PWTR Datasheet

  • UCC380001PWTR

  • Analog IC

  • 8頁

  • ETC

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UCC1800/1/2/3/4/5
UCC2800/1/2/3/4/5
UCC3800/1/2/3/4/5
Low-Power BiCMOS Current-Mode PWM
FEATURES
鈥?/div>
100
碌
A Typical Starting Supply Current
鈥?/div>
500
碌
A Typical Operating Supply
Current
鈥?/div>
Operation to 1MHz
鈥?/div>
Internal Soft Start
鈥?/div>
Internal Fault Soft Start
鈥?/div>
Internal Leading-Edge Blanking of the
Current Sense Signal
鈥?/div>
1 Amp Totem-Pole Output
鈥?/div>
70ns Typical Response from
Current-Sense to Gate Drive Output
鈥?/div>
1.5% Tolerance Voltage Reference
鈥?/div>
Same Pinout as UC3842 and
UC3842A
Part Number
UCCx800
UCCx801
UCCx802
UCCx803
UCCx804
UCCx805
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 crit-
ical 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 鈥?5
o
C to +125
o
C,
the UCC280x series is specified for operation from 鈥?0
o
C to +85
o
C, and
the UCC380x series is specified for operation from 0
o
C to +70
o
C.
Maximum Duty Cycle
100%
50%
100%
100%
50%
50%
Reference Voltage
5V
5V
5V
4V
5V
4V
Turn-On Threshold
7.2V
9.4V
12.5V
4.1V
12.5V
4.1V
Turn-Off Threshold
6.9V
7.4V
8.3V
3.6V
8.3V
3.6V
BLOCK DIAGRAM
UDG92009-3
03/99
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