LM2678: 24V to 8V/12V 5A buck down for DC motor power

DECORME Sebastien

Part Number: LM2678
Other Parts Discussed in Thread: LMR14050, LM61460, TPS40057

Hi,

I want to make a tiny motor board controller the Input is 24V and my motor are DC at 8V(or 12V) max.

The PWM controller is 40Khz capable.

I'm would like to know if the LM2678 buck down 12V/5A schematic deliver 12V even if the motor are off or if a continous load is needed to get the 12V

Is this chip is reliable for a motor application with the motor PWM commutation ?

Thanks

0 Andy Chen over 4 years ago

Hi Decorme

How about variation range of input 24V ?

Please check LM61460 or LMR14050 instead of LM2678 if you require tiny solution size.

B R
Andy

0 DECORME Sebastien over 4 years ago in reply to Andy Chen

Hi,

I don't have size problem for the first prototype.

I've found the TPS40057 with a higher current capabilities.

I can't solder QFN by myself so the LM61460 is out .

Thanks

0 Andy Chen over 4 years ago in reply to DECORME Sebastien

Hi,

LMR14050 is much more easy to use if the maximum average load current below 5A.

TPS40057 is controller for load current >5A, it's good choice if you prefer the leaded package.

B R

Andy

Power management forum