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LTM4625 switching frequency

Category: Datasheet/Specs
Product Number: LTM4625

I'm designing schematic with LTM4625 now.
I used LTPowerCAD and saw warning in iL Ripple at 1000KHz fsw.
I changed fsw to 860KHz, then the warning turned to right range (21%).
I saw the datasheet and calculated, then the resister value was 2M ohm.
Am I right?
LTPowerCAD display differently, so I'm confused.

Top Replies

    •  Analog Employees 
    +1 verified

    Hi  ,

    Sorry for the confusion, please follow the datasheet calculations.
    Note, the 'Rfreq' value shown in the LTM4625 LTpowerCAD schematic refers to the resistor from FREQ pin to GND only.

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  • Hi  ,

    Sorry for the confusion, please follow the datasheet calculations.
    Note, the 'Rfreq' value shown in the LTM4625 LTpowerCAD schematic refers to the resistor from FREQ pin to GND only.
    FYI, an update has just been made to now also include 'Rfreq2' in the LTM4625 LTpowerCAD schematic for the frequency setting resistor between FREQ pin and INTVCC (also see screenshot below for the updated schematic for reference).

    Please click 'Sync/Release' to get the latest.

    Thanks!

Reply
  • Hi  ,

    Sorry for the confusion, please follow the datasheet calculations.
    Note, the 'Rfreq' value shown in the LTM4625 LTpowerCAD schematic refers to the resistor from FREQ pin to GND only.
    FYI, an update has just been made to now also include 'Rfreq2' in the LTM4625 LTpowerCAD schematic for the frequency setting resistor between FREQ pin and INTVCC (also see screenshot below for the updated schematic for reference).

    Please click 'Sync/Release' to get the latest.

    Thanks!

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