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UCC2808A-xQ1是一系列BiCMOS推挽式,高速,低功耗,脉冲宽度调制器。 UCC2808A-xQ1包含离线或DC-DC固定频率电流模式开关电源所需的所有控制和驱动电路,外部元件数量最少。
UCC2808A-xQ1双输出驱动级以推挽式配置布置。两个输出均使用拨动触发器以振荡器频率的一半切换。两个输出之间的死区时间通常为60 ns至200 ns,具体取决于定时电容和电阻的值,从而将每个输出级占空比限制在50%以内。
UCC2808A-xQ1系列提供各种封装选项和欠压锁定电平选择。该系列具有UVLO阈值和滞后选项,适用于离线和电池供电系统。阈值显示在订购信息表中。
UCC2808A-xQ1是UCC2808系列的增强版本。重要的区别在于A版本具有从CS引脚到地的内部放电晶体管,在振荡器死区时间的每个时钟周期激活。该功能可在每个周期内释放CS引脚上的任何滤波电容,并有助于最大限度地降低滤波电容值和电流检测延迟。
Topology |
Control Method |
Vin (Min) (V) |
Vin (Max) (V) |
Frequency (Max) (kHz) |
UVLO Thresholds On/Off (V) |
Duty Cycle (Max) (%) |
Gate Drive (Typ) (A) |
Features |
Rating |
Operating Temperature Range (C) |
Pin/Package |
UCC2808A-2Q1 | LM25037-Q1 | UC2856-Q1 | UCC2808A-1Q1 | UCC28220-Q1 |
---|---|---|---|---|
Push-Pull | Full-Bridge Half-Bridge Push-Pull | Boost Flyback Forward Full-Bridge Half-Bridge Push-Pull | Push-Pull | Flyback Forward |
Current | Current Feedforward Voltage | Current | Current | Current |
4.1 | 5.5 | 8 | 8.3 | 10.5 |
15 | 75 | 40 | 15 | 14 |
1000 | 2000 | 1000 | 1000 | 2000 |
4.3/4.1 | Programmable/1.25V | 7.7/7 | 12.5/8.3 | 10.5/8.4 |
50 | 96 | 50 | 50 | 90 |
1 | 1.2 | 1.5 | 1 | 0.01 |
Soft Start | Adjustable Switching Frequency Current Limiting HV Start-up Multi-topology Programmable Max Duty Cycle Programmable Soft Start Synchronization Pin | Error Amplifier Multi-topology Soft Start Synchronization Pin | Soft Start | Adjustable Switching Frequency Current Limiting Input Line Monitor Multi-topology Programmable Max Duty Cycle Programmable Slope Compensation Soft Start |
Automotive | Automotive | Automotive | Automotive | Automotive |
-40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
8SOIC | 16TSSOP | 16SOIC | 8SOIC | 16SOIC 16TSSOP |