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Original question:

LM25143-Q1: VCC behaver related to VCCX pin setting, and how to current limit setting

LM25143-Q1: Hiccup Mode Timing Diagram

Isao Takigasaki
Intellectual 2710 points
Part Number: LM25143-Q1

Hi team,

The datasheet of LM25143-Q1 shows hiccup mode timing diagram in Fig. 9.6.  If the timing chart includes Vout, Iout, and Iout(CL), it's easy for my customer to understand the HICCUP mode behaver.

Could you show the timing diagram in this thread to explain the basic HICCUP mode behaver and the behaver in several cases which are described in 9.3.15?

Best Regards, Taki

  • 0
    TI__Guru 50120 points

    Hello Taki,

    Let me look into this and see if we have an internal waveform of this. 
    Otherwise I can check it on the LM25143EVM and report back with the hiccup waveform image. 

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    TI__Guru 50120 points

    Hello Taki,

    See below the waveform for VOUT and SW during hiccup condition. 

    The during of the switching is around 400useconds. Then since the device still senses that the output voltage is shorted to GND, it will turn off and wait several cycles (measured roughly 12.8ms) before it attempts to startup again. This is what is considered hiccup mode.

    Regards,
    Jimmy