UCC2810_10 Datasheet, PDF (1/12 Pages) Texas Instruments – DUAL CHANNEL SYNCHRONIZED CURRENT-MODE PWM

UCC2810
UCC3810
www.ti.com
SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007
DUAL CHANNEL SYNCHRONIZED CURRENT-MODE PWM
FEATURES
• Single Oscillator Synchronizes Two PWMs
• 150-µA Startup Supply Current
• 2-mA Operating Supply Current
• Operation to 1 MHz
• Internal Soft-Start
• Full-Cycle Fault Restart
• Internal Leading-Edge Blanking of the Current
Sense Signal
• 1-A Totem Pole Outputs
• 75-ns Typical Response from Current Sense
to Output
• 1.5% Tolerance Voltage Reference
N PACKAGE
(TOP VIEW)
SYNC 1
CT 2
RT 3
FB1 4
COMP1 5
CS1 6
OUT1 7
GND 8
16 VCC
15 REF
14 ENABLE2
13 FB2
12 COMP2
11 CS2
10 OUT2
9 PWRGND
DESCRIPTION
The UCC3810 is a high-speed BiCMOS controller
integrating two synchronized pulse width modulators
for use in off-line and dc-to-dc power supplies. The
UCC3810 family provides perfect synchronization
between two PWMs by usin g the same oscillator.
The oscillator’s sawtooth waveform can be used for
slope compensation if required.
Using a toggle flip-flop to alternate between
modulators, the UCC3810 ensures that one PWM
does not slave, interfere, or otherwise affect the
other PWM. This toggle flip- flop also ensures that
each PWM is limited to 50% maximum duty cycle,
insuring adequate off-time to reset magnetic
elements. This device contains many of the same
elements of the UC3842 current mode controller
family, combined with the enhancements of the
UCC3802. This minimizes power supply parts count.
Enhancements include leading edge blanking of the
current sense signals, full cycle fault restart, CMOS
output drivers, and outputs which remain low even
when the supply voltage is removed.
SYNC
CT
RT
FB1
COMP1
CS1
OUT1
GND
PW PACKAGE
(TOP VIEW)
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
REF
ENABLE2
FB2
COMP2
CS2
OUT2
PWRGND
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2007, Texas Instruments Incorporated