TPS54308: Periodic monitoring current

user6124773

Part Number: TPS54308

Hi：

I use TI TPS54308. I have some questions to consult, please help me solve them，thank you.

1.We put a magnetic bead on the DCDC output;The current magnetic bead is rated at 2.2A and can withstand 4.4A/20mS.I would like to ask you how long it takes to protect the output current of TPS54308 above 3A and cut off the output?

2.Chip PWM cycle refers to the chip internal switching frequency 0.35M, that is, 47uS?When the output is about 9V,47uS and the current is greater than 3A, can it be cut off？

3.In the specification, I(LIM_HS) max5.9A, I(LIM_LS) Max 5.5A, I want to know if it is larger than this parameter, can it be cut off?

4.In the specification, section 7.3.11.2, what exactly do 512 cycles and 16384 cycles refer to?Can you help to explain?

Sunny

over 6 years ago

0 Shawn Nie over 6 years ago

TI__Genius 10070 points

Hi,

When the current limit is triggered, the device waits 512 switching cycles, then enter hiccup mode.

512/350kHz=1.46ms.

16384 cycles means the device restarts after 16384 cycles hiccup time.

16384/350kHz=46.8ms

Shawn

0 user5861925 over 6 years ago in reply to Shawn Nie

Intellectual 570 points

Hi Shawn:

Thank you very much for your answer. In addition, please help to answer questions 2 and 3. Thank you.

2.When the output of 9 v is 46.8ms, we are currently greater than 3A, can it be cut off?

3.In the specification, I(LIM_HS) max5.9A, I(LIM_LS) Max 5.5A, I want to know if it is larger than this parameter, can it be cut off?

Sunny

0 Shawn Nie over 6 years ago in reply to user5861925

TI__Genius 10070 points

Hi Sunny,

2. It depends on the current of inductor, if the current limit is triggered, and it lasts 46.8ms, the converter would shut down.

For the second question, I am not sure what you are asking?

Shawn

Power management

Power management forum

TPS54308: Periodic monitoring current