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TPS61029-Q1: Short circuit protection

Markus_Fleck
Intellectual 1002 points
Part Number: TPS61029-Q1

Hello Apps Team,

I got the following questions regarding short circuit protection from my customer who is using TPS61029-Q1 in several projects to boost from 3.3V to 5V.

- At which current I-Out gets the short circuit protection active? I guess that's from 1500mA min and 1800mA typ.?

- When is the protection inactive again? I guess that's below 1500mA?

- How does this protection work (open the pmos by backgate control)?

The information would be helpful for my customers FMEDA.

Best Regards,

Markus

  • 0
    TI__Mastermind 46905 points
    the 1500mA~1800mA is the inductor peak current limit. if the peak current is higher than the limit, the output voltage VOUT will decrease. when the output current is so larger than the VOUT deceases to lower than input voltage. the device will stop switching. the NMOS keep off and the PMOS limit its current at 150mA, which is the pre-charge current during startup.
  • 0 in reply to Jasper Li
    Prodigy 10 points
    Hello Mr. Li,

    I am the guy who asked the question from Mr. Fleck - thanks for supporting!
    I refer to the functional block diagram of the datasheet ... So, if I understand correctly, at more than 1,8A (is also the DC value @ 105°C from our coil) the duty cyclye will change that VOUT decrease, right?!
    What I don't understand is, which NMOS keep off (in the block diagram I only see two PMOS; each one enhancment and deplation type). So the PMOS @ gate control stop switching and the other at backgate control Limit to 150mA, right?

    Thanks and best regards,
    Dominik Seyboth
  • 0 in reply to Dominik Seyboth
    TI__Mastermind 46905 points
    yes.
    the low side MOSFET between SW and GND stop switching.