LM5177: Operation by parallel connection

Kaji@PAN

Part Number: LM5177

Hello,

I am an FAE for a distributor that handles TI products.
I received a question from a customer about parallel connection with LM5177.
I found out in the thread below that this device can be connected in parallel.
(Question 1)
Since the image of the circuit attached to the thread is rough, details cannot be confirmed.
Is it possible to provide me with a document that clearly shows the details?
(Question 2)
Is it possible for the circuit attached to the thread to pass the current equally between the two devices?
If possible, please tell me how to make the current flow evenly.
(Question 3)
When paralleling, should the out-of-phase clock be input to the SYNC pin?
(Question 4)
Please let me know if there is a clock generator that can be used when connected in parallel. Output should be 4 or more.

Specifications are below.
VIN: 19V to 30V
VOUT: 24V
IOUT: 15A

Best regards,

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1162693/lm5177-can-this-device-be-used-for-interleaved-buck-boost?tisearch=e2e-sitesearch&keymatch=lm5177

over 2 years ago

0 Brigitte over 2 years ago

TI__Guru 65370 points

Hello Kaji,

We will send it to you next week.

Best regards,
Brigitte

0 Stefan Schauer over 2 years ago in reply to Brigitte

TI__Guru 58641 points

Hi Kaji,

i have attached the schematic for the parallel operation - I hope this gets with better quality now.

The current sharing is good balanced as the matching of the devices is on a high level. But If you would need an almost 50%/50% matching then you might need to consider a circuit as shown here:
https://www.ti.com/lit/pdf/snva826
But also here you need to ensure the accuracy of the used components for the load balancing fulfill your sharing requirements.

Yes, for paralleling a clock with 180Degree shift would be recommended.

Best regards,

Stefan