PMP11670: How to modify PMP11670 to 4.2A/5A total output (2.1A/2.5A each port) ?

Sara Bala

Part Number: PMP11670
Other Parts Discussed in Thread: TPS2549, LMR14050-Q1, LM73605-Q1

Hi,

May I know how to modify PMP11670 to 4.2A/5A total output (2.1A/2.5A each port) ?

Current design is 2.0A (port1) +1.5A (port2).

Since LM73605RNPR already outputs 5A, is changing TPS2549IRTERQ1 sufficient ?

Thank you.

over 5 years ago

0 Ryan Manack over 5 years ago

TI__Intellectual 2610 points

Hi Sara,

Yes you can modify the TPS2549 circuit. It's maximum current is 3.2A. You will need to adjust the programmed current limit.

Thanks,
Ryan

0 Sara Bala over 5 years ago in reply to Ryan Manack

Prodigy 50 points

BTW, is there any cheaper alternatives to replace LM73605RNPR?

0 Ryan Manack over 5 years ago in reply to Sara Bala

TI__Intellectual 2610 points

Another option is LMR14050-Q1, but it is non-synchronous. You would need to include a diode rectifier. The efficiency of this solution would not be great.

You can try increasing the switching frequency of LM73605-Q1. This will allow you to use a smaller inductance and the inductor size and cost should go down. Be careful with the increasing power dissipation in FETs + Inductor as the frequency increases.

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PMP11670: How to modify PMP11670 to 4.2A/5A total output (2.1A/2.5A each port) ?