LM51551: How to custom hiccup mode behavior in LM51551

Conor

Part Number: LM51551

Tool/software:

Hi,

We are currently evaluating the LM51551 for our application and have a question regarding the hiccup mode behavior.

According to the datasheet, LM51551 initiates a hiccup mode restart after detecting 64 cycles of current limiting, followed by a 32,768-cycle hiccup off-time before resuming operation. We would like to know if the following customizations are possible:

Extend the 64-cycle current limit detection window to allow the IC to remain in operation longer before entering hiccup mode
Shorten the 32,768-cycle hiccup off-time to enable faster restart

Could you please advise if there are any methods (e.g., external component configuration or alternative devices) that can achieve this behavior?
If these parameters are internally fixed and not configurable, we would appreciate confirmation of that as well.

Best regards,
Conor

2 months ago

+1 Mounika Girish 2 months ago

TI__Intellectual 2426 points

Hi Conor,

Thank you for using e2e forum.

These parameters are internally fixed and not configurable.

Best regards,

Mounika

0 Conor 2 months ago in reply to Mounika Girish

Guru 12115 points

Hi Mounika,

We understand that the current limit duration in the LM51551 is defined by an internal timer.
One of our customers is not fully satisfied with the overcurrent protection behavior, and they are asking if it would be possible for TI to support a custom part number with modified hiccup mode behavior.

If there is any flexibility to change these parameters (such as the number of current limit cycles or hiccup off-time) as a custom variant, we would like to escalate this request internally for further discussion.
This is for a project with significant business volume, so we would appreciate your guidance on whether such a custom option could be considered.

Thanks,

Conor

0 Mounika Girish 2 months ago in reply to Conor

TI__Intellectual 2426 points

Hi Conor,

Please allow me some days to connect with my internal team. I will get back to you as soon as I can.

Best regards,

Mounika

0 Conor 2 months ago in reply to Mounika Girish

Guru 12115 points

Hi Mounika,

Thanks. If you need any project information to consider the above, I will email you with a cc to TI FAE/SALES.

Thanks,

Conor

0 Mounika Girish 2 months ago in reply to Conor

TI__Intellectual 2426 points

Hi Conor,

Yes, that would be really appreciated. Please write to me looping our TI sales contact

Best regards,

Mounika

0 Conor 2 months ago in reply to Mounika Girish

Guru 12115 points

Hi Mounika,

Could you please advise the appropriate BU contact for this inquiry?

I am an FAE from a TI distributor and plan to copy the local TIJ FAE/PS contact on the email when reaching out.

Thanks,

Conor

0 Mounika Girish 2 months ago in reply to Conor

TI__Intellectual 2426 points

Hi Conor,

Can you please connect with me and send me a private message on E2E.

Best regards,

Mounika

Power management

Power management forum

LM51551: How to custom hiccup mode behavior in LM51551