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

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.