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RT/CLK signal of stand alone TPS54620

LewisC
Intellectual 490 points
Other Parts Discussed in Thread: TPS54620

Hi

What is the signal of RT/CLK in stand alone TPS54620?

Is it a simple reference DC level for internal OSC?

Or is it a part of OSC? if yes, how can I to meansure the waveform?

  • 0
    TI__Genius 11095 points

    Hi LewisC - To use the TPS54620 as a stand-alone device, you should terminate the RT/CLK pin with a resistor to ground. The value of this resistor will set the switching frequency. Page 13 of the datasheet has an equation which can be used to calculate the RT resistor for a given desired switching frequency

    If you measure RT/CLK while the device is powered, you will see a DC level, of appx 0.5V. The device regulates this pin to ~0.5V, and uses the source current this requires to set up the frequency of the oscillator internally. 

  • 0 in reply to Matt Schurmann
    Intellectual 490 points

    Thanks Matt

    That is what I see with my circuit.

    Shall we use one RT/CLK signal to another?

    Or there must be using external clock for TPS54620 parallel operation?

  • 0 in reply to LewisC
    TI__Genius 11095 points

    I would recommend that each TPS54620 device is given its own RT resistor.

    If you want the devices to be synchronized, then apply an external clock to the RT/CLK pin. Still use an RT resistor, even if you plan to use an external clock sync signal