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LM46002 SYNC pin question in inverting application

BX27
Genius 3900 points
Other Parts Discussed in Thread: LM46002

Hi there

I am looking into this demo SCH of TI, for inverting application of LM46002.

My question is , why there is an 0 ohm resistor R5 placed between SYNC pin and -Vout? I thought the capacitor C10 as an AC coupling is enough. 

Could you please help explain? Thanks.

  • 0
    TI__Genius 15810 points
    Hello,
    The SYNC pin needs to be connected to the IC ground when not used. The '0' ohm resistor is a place holder to do just that. If you would like to use the frequency sync feature, then you would need to remove the resistor.

    Regards,
    Akshay
  • 0 in reply to Akshay Mehta
    Genius 3900 points

    Hi , Akshay.

    In Figure 41 of Datasheet, there is a Rterm. Could I think this resistor have two functions?: (1)high-speed termination when external sync clock appears, and (2) pull-down to GND when sync signal disappears.

    Generally what's the value of this resistor? 50-100ohm?


    Thanks!