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%.