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one question about boost converter

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phosphor_zhu

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i am now do my circuit simulation.it is a boost. And the efficiency is too low, about 75%.
and the rest power is occupied by :

inductor model : 6%
diode : 5.34%
power mosfet (a high voltage model): 8.18%
power line:3.5% (include power ,ground ,bondwire,package pararistic)

does the above efficiency occupied are all correct ?
please help me !
 

Those numbers sound reasonable to me. What frequency are you running at and what is the input/output voltage and output current? What type of efficiency are you hoping for?

You can get discrete inductors with very low ESR. You can make your switch bigger(you have to be careful becaue there is a point where your switching losses become greater then the increase in efficiency you get from a lower RDSon). Are you using a schottky diode and is it's current rated high enough? Can you add more bond wires? Can you run at a slower frequency? There are only so many things you can do to increase efficiency.
 

haff99 said:
Those numbers sound reasonable to me. What frequency are you running at and what is the input/output voltage and output current? What type of efficiency are you hoping for?

You can get discrete inductors with very low ESR. You can make your switch bigger(you have to be careful becaue there is a point where your switching losses become greater then the increase in efficiency you get from a lower RDSon). Are you using a schottky diode and is it's current rated high enough? Can you add more bond wires? Can you run at a slower frequency? There are only so many things you can do to increase efficiency.
Click to expand...

thank you . i think you must be very good at design boost converter. and i have
some more questions.
the input voltage is 2.7v, output current is 20mA, output voltage is 8.2v.
the efficiency i want is 85%.

discrete inductor ? the inductor'esr now is 0.26ohm. does it big?


you have to be careful becaue there is a point where your switching losses become greater then the increase in efficiency you get from a lower RDSon).[/quote]

the switch W/L=60×450,it is a high voltage model.

yes, i am now use schottky diode. to 20mA load i think it will be good.
 

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