FEATURES
Push-Pull Oscillator With Programmable
Deadtime
High-Current Totem-Pole Dual Output Stage
Drives Push-Pull Configuration with 1-A Sink
and 0.5-A Source Capability
Can be Used in Push-Pull, Half-Bridge, or
Full-Bridge Topologies
Oscillator Synchronization Output
Low Start-Up Current of 130 μA and 1.4-mA
Typical Run Current
Over-Current Shutdown
Digitally Controlled Over-Current/Retry
Feature
Undervoltage Lockout With Hysteresis

APPLICATIONS
High Efficiency Cascaded Converters
Inverters
Electronic Ballasts
Uninterruptable Power Supplies (UPS)
AC or DC Links

DESCRIPTION
The UCC28089 is a versatile BiCMOS controller for
dc-to-dc or off-line fixed-frequency switching power
supplies. The UCC28089 has dual alternating output
stages in dual-alternating push-pull configuration. Both
outputs switch at half the oscillator frequency using a
toggle flip-flop and duty cycle is limited to less than 50%.