TPS50601-SP: OFF time range

Anthony Flores

Part Number: TPS50601-SP

Tool/software:

Hi,

The TPS50601 datasheet only specifies a typical for the minimum off time. How is the off time derived? I'm assuming that it's based on the RC time constant of the bootstrap capacitor. Is there margin already built into the 500ns typical or what would be the worst-case minimum off time?

I've initially assumed similar tolerances as the minimum on time, but I've got a similar scenario as this thread

TPS50601-SP: Worst Case Time On/Off min Application - Power management forum - Power management - TI E2E support forums

where I question if it's overkill to assume the same tolerance as on time since I would have to make a significant adjustment to the frequency.

6 months ago

0 Andy Fondaw 6 months ago

TI__Expert 5181 points

Hi Anthony,

I will need some time to look into this, as it will likely require asking our design team.

Since the minimum off-time is only defined as a typical, it may not be possible to define a hard maximum bound.

I will update this thread when I have more information.

Thanks,

Andy

0 Andy Fondaw 6 months ago in reply to Andy Fondaw

TI__Expert 5181 points

Hi Anthony,

Since the minimum off time of the TPS50601-SP is only a typical value, and data was never collected to provide a minimum or maximum bound, unfortunately I cannot provide a certain value for the Max or "worst-case" minimum off time.

I was able to confirm with our design team however that the time is dependent on the RC charging of CBOOT. Additionally, the factors that drive tolerances for the minimum on time are not the same as those for minimum off time, so there is no reason to expect the tolerances to be the same.

Thanks,

Andy