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how to test the dc/dc converter's load regulation???

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batistuta

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hi,all
i need your help, about dc/dc test,
when design a dc/dc converter, such as buck, we usually sim its' load regulation through change its' output loading current, but how to get the load regulation in actual testboard, i mean how to change its' loading current?? from 100ma to 200ma, and then from 200ma to 100ma, just as a pulse signal. and see the output voltage value.

tell me your method during actual test...
thanks.
 

you can use variable resistor, then chnage the value of that according to your current ratings.

darla
 

    B

    batistuta

    Points: 2
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thanks, darla!
but how to change resistor so fast? use switch??
 

Just have few minutes.......done
Here is ya answer, attached
 

Just use a mosfet to switch a load in and out. Like this.

ejzyvq.png


Fet on full load Fet off no load .

If you don't have a function generator just use a 555 timer and a driver,for the mosfet.
 

batistuta said:
thanks, darla!
but how to change resistor so fast? use switch??
Click to expand...

use variable resistor/Rheostat

darla
 

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    batistuta

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hi, all
thanks for your answer, these methods you give out,
is used during run simulation under candence inviroment, but i want to know the method on the testbench---->>pcb board.
thanks

Added after 1 minutes:
 

The method I posted is how you test it on a bench. Use a mosfet to switch between no-load and full- load.When the mosfet is off your converter is lightly loaded 330 ohm's,whent the mosfet is on your coverter is heavily loaded with the current flowing through both the 330 and 33 ohm resistor.

See this if it's still not clear.

Code: 
http://www.maxim-ic.com/appnotes.cfm/an_pk/752

The schematic is just the output of your regulator load portion.
 

    B

    batistuta

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max0412 said:
The method I posted is how you test it on a bench. Use a mosfet to switch between no-load and full- load.When the mosfet is off your converter is lightly loaded 330 ohm's,whent the mosfet is on your coverter is heavily loaded with the current flowing through both the 330 and 33 ohm resistor.

See this if it's still not clear.

Code: 
http://www.maxim-ic.com/appnotes.cfm/an_pk/752

The schematic is just the output of your regulator load portion.
Click to expand...

thanks, max0412, i get your idea...

Added after 1 minutes:

darla1 said:
batistuta said:
thanks, darla!
but how to change resistor so fast? use switch??
Click to expand...

use variable resistor/Rheostat

darla
Click to expand...

hi,darla!

can you give me some references about dc/dc converter ac sim model?
i saw a topic of yours, about ac sim model.
thanks
 

[/quote]

hi,darla!

can you give me some references about dc/dc converter ac sim model?
i saw a topic of yours, about ac sim model.
thanks[/quote]

hi

in which simulation s/w you want... i can provide matlab/psim...SPICE i dont have ready model.....

darla
 

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    batistuta

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Hi
If y want spice models for dc-dc convertors... refer to spice cookbook by christopher basso. you can find it in this forum



press helped if it helps!!
 

    B

    batistuta

    Points: 2
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hi,darla!

can you give me some references about dc/dc converter ac sim model?
i saw a topic of yours, about ac sim model.
thanks[/quote]

hi

in which simulation s/w you want... i can provide matlab/psim...SPICE i dont have ready model.....

darla[/quote]

can you send me the matlab ?
thanks.

Added after 3 minutes:

ashish_chauhan said:
Hi
If y want spice models for dc-dc convertors... refer to spice cookbook by christopher basso. you can find it in this forum



press helped if it helps!!
Click to expand...

thanks...:D

Added after 2 minutes:

hi, all

can you upload the paper which you think beter for design that you have studyed before, or some scholar paper.
thanks, need you guidlilne!
 

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