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UC2842A:Overcurrent protection

Araki Yohi
Prodigy 10 points
Part Number: UC2842A
Other Parts Discussed in Thread: UCC28740

Tool/software:

UC2842Aに外部回路を追加して、ドループ特性の過電流保護を実現する方法はありますか?検出する電流は、主回路の一次側電流です。

  • 0
    TI__Guru 73495 points

    Hi,

    Please use English in this E2E.

  • 0 in reply to Hong Huang
    Prodigy 10 points

    I'm so sorry.
    Is there a way to add an external circuit to the UC2842A to implement droop characteristic overcurrent protection? For example, the idea is to reduce the frequency and thereby decrease the current when the overcurrent value is exceeded. The current to be detected is the primary side current of the main circuit.(Droop characteristic ≒ A characteristic where the output voltage remains constant and the output current is reduced to 0A, similar to CVCC.)

  • 0 in reply to Araki Yohi
    TI__Guru 73495 points

    Hi,

    For CVCC control, you need to add a current detection and when current reaches the setpoint then the IC will regulate current instead of voltage. The IC is with fixed frequency so it is not possible to vary the frequency to control a constant current. 

    Depending on your input voltage range, you may consider a different IC, an example is UCC28740 which has CVCC control as its feature.