TPS74701-Q1: TPS74701 start-up time

Michael Huang

Part Number: TPS74701-Q1
Other Parts Discussed in Thread: TPS74701

Hi Expert,

According to TPS74701 datasheet，when Css open, minimum start-up time is 200us，This start-up time is from EN high to output begin to rise, right？

Besides，when Css open，Pin functions mention that soft-start ramp time is typically 200us，but in table 4 soft-start time is 0.1ms，how to understand this "0.1ms"？

Thanks for support!

Michael.

over 2 years ago

0 Nick Butts over 2 years ago

TI__Guru 50025 points

Hi Michael,

The soft-start time is the 10-90% rise time, and not the delay until the output starts to ramp.

I think the Table 4 value for open Css is probably wrong. Figure 20 shows an example startup and the startup is much closer to 200us than 100us. The EC specs are what you should take as true.