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TL284x和TL384x系列控制集成电路提供实现离线或DC-DC固定频率电流模式所需的功能控制方案,具有最少数量的外部组件。一些内部实现的电路是欠压锁定(UVLO),具有小于1 mA的启动电流,以及精确的基准电压,用于误差放大器输入的精度。其他内部电路包括确保锁存操作的逻辑,脉冲宽度调制(PWM)比较器(也提供限流控制),以及设计用于提供或吸收高峰值电流的图腾柱输出级。适用于驱动N沟道MOSFET的输出级在关断状态下为低电平。
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 |
TL3844 | TL3842 | TL3843 | TL3845 |
---|---|---|---|
Boost Flyback Forward | Boost Flyback Forward | Boost Flyback Forward | Boost Flyback Forward |
Current | Current | Current | Current |
17.5 | 17.5 | 9 | 9 |
35 | 35 | 35 | 35 |
500 | 500 | 500 | 500 |
16/10 | 16/10 | 8.4/7.6 | 8.4/7.6 |
50 | 100 | 100 | 50 |
0.2 | 0.2 | 0.2 | 0.2 |
Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology | Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology | Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology | Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology |
Catalog | Catalog | Catalog | Catalog |
0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 |
14SOIC 8PDIP 8SOIC | 14SOIC 8PDIP 8SOIC | 14SOIC 8PDIP 8SOIC | 14SOIC 8PDIP 8SOIC |