TPS62148: Current Limit action

Oba

Genius 17335 points

Part Number: TPS62148
Other Parts Discussed in Thread: TPS62147

Hi,

I have a question about current limit of TPS62148.

There is the below description on section 9.4.4, P12 of the datasheet(SLVSDR8),

“The TPS62148 is protected against overload and short circuit events. If the inductor current exceeds the current

limit I(LIMF), the high side switch is turned off and the low side switch is turned on to ramp down the inductor

current. “

Is this current limit behavior, high side turned off and low side turned on, latched action?

Meaning does it also continue after this current limit condition is removed ?

Or is it the action only during exceeding the current limit?

Meaning does it go back to normal behavior after this current limit condition is removed?

Also is this current limit value peak current or average current ?

Regards,

Oba

over 6 years ago

0 Alfonso Furio over 6 years ago

TI__Expert 3645 points

Hello,
sorry for the delay due to the holidays period. We will get back to you as soon as possible in the first week of January.

0 Chris Glaser over 6 years ago

TI__Guru**** 150900 points

Hi Oba-san,

The protection is non-latching. If it were latching, we would have stated this. Note that the TPS62147 has hiccup current limit protection.

Once the load current reduces, the IC returns to normal operation which regulates the output voltage (and not the inductor current).

The current limited is the peak current, measured cycle by cycle.

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TPS62148: Current Limit action