This datasheet is about CS51021A/2A/3A/4A fixed frequency PWM current mode controller, which provides all necessary features required for AC-DC or DC-DC primary side control. The family includes several features to eliminate the additional components needed to implement them externally. In addition to low start-up current (75µA) and high frequency operation capability, the CS51021A/2A/3A/4A family includes overvoltage and undervoltage monitoring, externally programmable dual threshold overcurrent protection, current sense leading edge blanking, current slope compensation, accurate duty cycle control and an externally available 5.0 V reference. The CS51021A and CS51023A feature bidirectional synchronization capability, while the CS51022A and CS51024A offer a sleep mode with 100µA maximum IC current consumption. The CS51021A/2A/3A/4A family is available in a 16 lead narrow body SO package.
The CS51021A/2A/3A/4A family provides all necessary features required for AC–DC or DC–DC primary side control. Key features include low startup current, fixed frequency control, overvoltage and undervoltage monitoring, programmable overcurrent protection, and an externally available 5.0 V reference. The CS51021A and CS51023A feature bidirectional synchronization capability, while the CS51022A and CS51024A offer a sleep mode with 100 µA maximum IC current consumption.
| Startup Current | 75 µA Max. |
|---|---|
| Switching Frequency | 1.0 MHz |
| Operating Junction Temperature | 150 °C |
| ESD Rating | 2.0 kV |
| Reference Voltage | 5.0 V |
| Package Type | 16 lead narrow body SO |
The maximum startup current is 75 µA.
The CS51021A and CS51023A models feature bidirectional synchronization capability.
The maximum sleep current is 100 µA.