LM5069: LM5060 - Alternate Part for LM5069MM-2/NOPB

Hi Deepak,

Welcome to E2E!

Yes dv/dt circuit can be used on other hot-swap controllers as well. But LM5069 offers better protection over LM5060.

Can you share your requirements to suggest options.

Regards, 

Rakesh

Hi Rakesh,

Thanks for the feedback. We have further one clarification to be made : 

We are looking for the alternate to LM5069MM due to OV Spikes & UV Glitches so the alternate part search is LM5060.
Also we would need to know if LM5060 overcomes such issues as in the LM5069MM. Need your advice and Recommendation.

We are using I/O Cards as hot plug to Hot Swap Controller and avoid inrush issues.

With Regards,
Deepak Sibi

Hi Deepak,

Can you please detail me what are the challenges you are facing with LM5069?

What do you mean by OV Spikes & UV Glitches ?

Regards, 

Rakesh

Hi Rakesh,

On full load the in-rush current protection circuits of LM5069-2 IC gets activated before the system reaches stable nominal voltage of 24V DC. This causes a reboot of the IC and thus rebooting the entire device making it unstable.

In real time applications the fed input power causes voltage spikes or voltage dips for a few milliseconds in turn falsely triggers the OV/UV protection circuitry of LM5069, therefore leads the system reboots needlessly.

We plan to use LM5060 but will the same problem appear in this IC also.

With Regards,
Deepak Sibi

Hi Deepak,

We need to enable the load using PG signal of LM5069 else the circuit starts in power or current limit mode and fails to start. Can you fill LM5069 design calculator with your inputs to check external parameters. It is available at LM5069 Design Calculator (Rev. D)

For OV Spikes & UV Glitches issues, use capacitors at EN/UVLO and OV pins to avoid system reset

Regards, 

Rakesh

Hi Rakesh,

Could you please review the Circuit been designed for application. 

1. The Input Voltage is, Min19.4V and Max 29.5V , and we are expecting any voltage glitch under 19.4V should be treated as UV and any spike above 29.5V should be considered as OV with a Typical O/P Voltage of 24V at Max 12A rating.

2. As already mentioned above there are 2 current issues which triggers falsely for System Reboot.

3. Yes we have added additional capacitors EN/UVLO and OV pins

With Regards,
Deepak

Hi Rakesh,

Its an Schottky diode.

On the design Calculator, We are using Option B

As per the design calc R1,R2 R3 R4 values turns out to be out of  device  operating range.

But when we tune manually these resistors, the device is in operating range. 

The MOSFET used is IPB027N10N3G

Can we use the above manual resistor value. Please advice.

Hi Rakesh,

Please find the Design Calculator Sheet for your reference.LM5069_Design_Calculator_REV_C_Real_Calculation.xlsx

Hi Deepak,

Thanks. I will review and get back by early next week.

Regards, 

Rakesh

Hi Deepak,

You have to enter the SOA details of the Infineon FET you are using in the design. 

Is your "Startup Load Value" = 0 ?

Regards, 

Rakesh

Hi 

Hi Rakesh,

We have used the SOA of MFR Part Number IPB027N10N3GATMA1, MFR Infineon that is being used in our design.

As per TI recommendation, the start Up load should be ‘0’ for calculation, hence we have used it.

With Regards,
Deepak Sibi