ACT4529
Rev 4, 06-Jan-2017
APPLICATIONS INFORMATION
Current Sense Resistor
The traces leading to and from the sense resistor
can be significant error sources. With small value
sense resistors, trace resistance shared with the
load can cause significant errors. It is recommended
to connect the sense resistor pads directly to the
CSP and CSN pins using “Kelvin” or “4-wire”
connection techniques as shown below.
PCB Load
Trace
Kevin Sense
Traces
Sense
Resistor
Current Limit Setting
If output current hits current limit, output voltage
drops to keep the current to a constant value.
The following equation calculates the constant
current limit.
66 mV
ILimit ( A)
(6)
Rcs (m)
Where Rcs is current sense resistor.
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