• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 379 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS54360 - 100% duty cycle

Jason Dai
Expert 3720 points
Other Parts Discussed in Thread: TPS54360

Dear E2E,

 Our customer is looking for buck converter to step down 11.5V-57Vin into 10Vout with 1.5A load current. I found that TPS54360 can support low dropout operation even 100% duty cycle. The datasheet mentioned that "high side MOSFET of the TPS54360 will
operate at 100% duty cycle as long as the BOOT to SW terminal voltage is greater than 2.1V". My question is how to check if BOOT-SW voltage is greater than 2.1V? I mean that how to check if customers condition can work well or not?

BR,

Jason 

  • 0
    TI__Guru**** 191445 points
    The high side gate drive is supplied by the BOOT voltage (remember the gate drive has to be higher than Vin). When the duty cycle required goes above 100%, the high side FET can remain on until the BOOT charge is exhausted below 2.1 V relative to SW. Then the high side turns off and the BOOT charge is replenished. For you condition, the duty cycle is only 87%. You should never reach that low headroom operating condition.