How to Find Peak Current

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Anonymous
Not applicable

 Hi,

   

   I am working CY8CKIT-001 DVK with CY8C55 Family processor module.In this how can we find the peak current, average current,taken by the board.

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ETRO_SSN583
Level 9
Level 9
250 likes received 100 sign-ins 5 likes given

A quick and dirty method is with a DSO and a 1 ohm resistor in power lead.

   

 

   

Set DSO up for infinite persistance, and look at V drop across R, that will give you peak.

   

Now set DSO up to average its input channels, and look again at drop across R.

   

 

   

Regards, Dana.

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ETRO_SSN583
Level 9
Level 9
250 likes received 100 sign-ins 5 likes given

A quick and dirty method is with a DSO and a 1 ohm resistor in power lead.

   

 

   

Set DSO up for infinite persistance, and look at V drop across R, that will give you peak.

   

Now set DSO up to average its input channels, and look again at drop across R.

   

 

   

Regards, Dana.

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ETRO_SSN583
Level 9
Level 9
250 likes received 100 sign-ins 5 likes given

Hall effect another approach -

   

 

   

www.infineon.com/dgdl/Current_Sensing_Rev.1.1.pdf

   

 

   

Regards, Dana.

HeLi_263931
Level 8
Level 8
100 solutions authored 50 solutions authored 25 solutions authored

If you happen to have a multimeter with logging capability, use the approach with the 1Ohm resistor (or a larger one if you maximum current is lower than say 100mA). You can then use a spreadsheet (or whatever software the multimeter brings with it) to calculate what you need.