UCC28089

具有死区时间控制的初级侧推挽振荡器

The 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%.

The UCC28089 is optimized for use as the primary-side companion controller for a cascaded converter that has secondary-side control. The device incorporates dead-time programming. The synchronization output also provides dead-time information. The retry and soft-start duration scales with the oscillator clock frequency for high performance fault recovery.

The UCC28089 also provides primary side under-voltage protection UVLO, and over-current protection. Both the soft start and retry after fault durations scale with oscillator frequency for high performance. The turn-on/off UVLO thresholds are 10.5 V/8.0 V.

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Push-Pull Oscillator With Programmable Deadtime

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High-Current Totem-Pole Dual Output Stage Drives Push-Pull Configuration with 1-A Sink and 0.5-A Source Capability

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Can be Used in Push-Pull, Half-Bridge, or Full-Bridge Topologies

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Oscillator Synchronization Output

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Low Start-Up Current of 130 µA and 1.4-mA Typical Run Current

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Over-Current Shutdown

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Digitally Controlled Over-Current/Retry Feature

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Undervoltage Lockout With Hysteresis

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APPLICA ONS

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High Efficiency Cascaded Converters

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Inverters

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Electronic Ballasts

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Uninterruptable Power Supplies UPS

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AC or DC Links