Two Regulator (TPS5450-EP) in Parallel

Mohammed Azlum

Intellectual 835 points

Other Parts Discussed in Thread: TPS5450-EP, TPS53319, TPS5450

Hello All,

My input to the board is 19.5V,3A (laptop charger) and I need to convert this 19.5V, 3A into 5V, 6A & 10A.

So can I use two TPS5450-EP by connecting parallel mode as attached image ?

Please re-view my connection and let me know your feedback.

Regards,

Azlum

over 10 years ago

0 Peter Meaney over 10 years ago

TI__Mastermind 31580 points

Hi Azlum,

This post belongs in the non-isolated dc/dc forum, one of my colleagues will pick it up there.

Regards

Peter

0 JohnTucker over 10 years ago in reply to Peter Meaney

TI__Guru**** 191445 points

You cannot reliably current share using 2 TPS5450. TPS53319 would be my choice for integrated solution. There are other options for controllers.

0 Mohammed Azlum over 10 years ago in reply to JohnTucker

Intellectual 835 points

OK got it. But logically when two regulators connect in parallel the output current should increase. Is it ?

Regards,

Azlum

0 JohnTucker over 10 years ago in reply to Mohammed Azlum

TI__Guru**** 191445 points

Usually one converter will operate at current limit while the other may have low output current. There is no mechanism to force them to share current equally. Some current mode control devices may have the ability for parallel operation, but voltage mode control cannot do it.

Power management

Power management forum

Two Regulator (TPS5450-EP) in Parallel