application
INFO
available
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
•
100
µ
A Typical Starting Supply Current
•
500
µ
A 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
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
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 C to +125 C,
o
o
the UCC280x series is specified for operation from –40 C to +85 C, and
o
o
the UCC380x series is specified for operation from 0 C to +70 C.
o
o
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
SLUS270C
- MARCH 1999 - REVISED JANUARY 2005
TI [ TEXAS INSTRUMENTS ]
