TPS54332: the condition which switching operation stops

Hirotaka Matsumoto

Part Number: TPS54332

Hi all

Would you mind if we ask TPS54332?

<Question1>
Could you let us know the condtion which switching operation stops?
We guess that condtions are UVLO, OCP and OVP, right?

<Question2>
In relation to <Question2>, how much is the time(cycle) which switching operation stops after OCP?
And, how much is the OCP's deglitch time?(the next duty cycle time? 1us?)

Kind regards,

Hirotaka Matsumoto

over 8 years ago

0 Luke Pan over 8 years ago

TI__Intellectual 2790 points

Hi,
Q1: UVLO, OVP, OTP, EN disable stops switching. OCP only lower the switching frequency, actually, it still switchs.
Q2: when the high side current hit the current limit, it stops switching immediately (may have several ns daley due to the driver circuit). and the device will switch in next switch cycle, the switch frequency depens on the Vfb voltage. Pls refer to table 2 for more information.

0 Hirotaka Matsumoto over 8 years ago in reply to Luke Pan

Guru 27585 points

Luke san

Thank you for your reply!

We would like to confirm one poit.

"When the high side current hit the current limit, it stops switching immediately (may have several ns daley due to the driver circuit)."
->Is the current limit "Current limit threshold reaches typ 6.5A? It stops switching immediately, after that, the switching frequency will be decreased like as table 2.
Is our recogniton correct?

Kind regards,

Hirotaka Matsumoto

0 Luke Pan over 8 years ago in reply to Hirotaka Matsumoto

TI__Intellectual 2790 points

Hirotaka san,
Yes, your understanding is correct.

0 Hirotaka Matsumoto over 8 years ago in reply to Luke Pan

Guru 27585 points

Luke san
OK, we got it. Thanks!

Power management

Power management forum

TPS54332: the condition which switching operation stops