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Primary-Side Push-Pull Oscillator with Dead-Time Control


Package | PIN: D | 8
Temp: S (-40 to 105)
Carrier: Partial Tube
Qty Price
1-9 $2.58
10-24 $2.31
25-99 $2.15
100-249 $1.87
250-499 $1.73
500-749 $1.45
750-999 $1.19
1000+ $1.09


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

Texas Instruments  UCC28089D

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%.

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.