UCC28089DG4

带有死区时间控制初级侧PUSH - PULL振荡器 PRIMARY-SIDE PUSH-PULL OSCILLATOR WITH DEAD-TIME CONTROL

DESCRIPON

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%.

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