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UCC2897A: SYNC Pin for Out-of-Phase Synchronization

Part Number: UCC2897A

Hello,

I see in the datasheet you can connect the SYNC pin between two of these devices and have the devices operate in synchronization.

However, the customer is running two of these devices at approximately equal power and duty cycle on a single board. They would like to sync them out of phase in order to minimize current ripple. Is there an easy way to accomplish this? Is there some sort of delay or inverting circuit we can place between the sync pins of these two devices?

Thank you!

Ryan B.

  • Hi Ryan.Bishop,

    It should be possible to do what you are asking. All that is needed is a simple digital delay circuit (mono-stable) to apply a fixed delay (Tsw/2) to the synch circuit generated by one device before it is fed into the other. Please ensure that the delayed synch signal meets the requirements given in the datasheet regarding min/max pulse width.

    Thanks

    Joe Leisten