二极管

USB

三极管

可控硅(晶闸管)

场效应管(MOSFET)

集成电路

连接器

LED系列产品

电感器

继电器

传感器

电容器

电阻器

保护器件

光电器件

压电晶体

开关原件

功率模块

说明

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.

特性

• 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