HIgh current application DC-DC convertion using LM5118

Joshua Woodward

Other Parts Discussed in Thread: LM5118, LM5119

I am trying to find a solution for a DC-DC conversion from a 1000W Brushless DC motor to a capacitor back with a max voltage of 10.8V. Most of the Buck-Boost converters I have seen can't handle this amount of power. If I understand the product right can the LM5118 be used as the the switching regulator as long as I get a MOSFET that can handle about 95A? Or will the 95A damage the LM5118? Do you have any other possible solutions?

over 11 years ago

0 Joshua Woodward over 11 years ago

Prodigy 30 points

Looks like the LM5119 might be better suited, with the higher current limit could I place about 7 of these in parallel to handle the 1kW power?

0 EricLee over 11 years ago in reply to Joshua Woodward

TI__Guru 58691 points

Even if you have MOSFETs which can handle about 100A, you might not be able to find a suitable inductor, not be able to optimize PC board layout with small sense resistor value ( <1 mOhm)

Regards,

0 Joshua Woodward over 11 years ago in reply to EricLee

Prodigy 30 points

Vicor and Vishay both make inductors that can handle upwards of 80-90 Amps.

Is there any other TI solution that can regulate the voltage from a 48 V 1kW DC motor to a capaicitor bank with a limit of 10.8 V?

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HIgh current application DC-DC convertion using LM5118