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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | Primary-Side Push-Pull Oscillator with Dead-Time Control datasheet (Rev. A) | 25 Aug 2006 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 |
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| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
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